For the best results, maintain a regular and timely fungicide application program and ensure that you cover all the susceptible areas of the mango … Spores of the algae (called sporangia) are formed on the spots, giving them a furry look (Photo 2). The sooty mold won't cause any direct infection to plants, but it may effect the photosynthetic process which may cause premature aging and death of leaves. If you notice orange, rusty spots developing all over your leaves, you might have algal leaf spot. As awful as those algal leaf spots look, they’re not necessarily damaging your tree. On leaves, green to orange spots develop, which are round, 2-4 mmm diameter, flattened with furry growth and indistinct margins (Photo 1). Plant vigour and yield are seldom impacted severely, so management isn't necessary in most cases. Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community. Algal leaf spot = red rust Cephaleuros virescens Kunze Black tip Post-harvest disorder of unknown cause Brushing damage Excessive post-harvest brush polishing of fruit Bunchy top Unknown cause Chilling injury Temperatures from 7-13 °C; cultivar dependent. Algal Leaf Spot caused by Cephaleuros virescens is not detrimental to plant health. In most cases, algal leaf spot is only an aesthetic issue. Bacterial black spot of mango caused by X. citri pv. In case of severe infestation the fruits may fall prematurely, whereas the mature fruits are reduced in size. Pirie Printers Pty Limited, Canberra, Australia. Some of the plants it infects include Mangoes, Avocadoes, Tea, Citrus and Coconut. Last modified: Monday, 16 January 2012, 5:21 AM ... Grey Blight/ Pestalotiopsis Leaf Spot of mango. Look for the green or orange, slightly raised, furry spots on the leaves that often merge to form large blotches. You may use , Click here to go to the topics page to know more about the crop. Algal leaf spot is caused by Cephaleuros virescens, which is a widespread plant parasitic green alga. Also this insects are always associated with ants. In Samoa, this is commonly seen on cocoa seedlings planted without shade. The algal attack causes reduction in photosynthetic activity and defoliation of leaves thereby lowering vitality of the host plant. Algal Leaf Spot of Guava Treatment. Mushroom root rot Armillaria tabescens. Mango midges affect mostly young developing leaves. Mango malformation Fusarium subglutinans (Note: some debate remains as to complete etiology of this disease.) Reduction in photosynthetic activity and defoliation as a result of algal attack lower vitality of the host plant. are spread in wind and rain. Tender shoots and foliage are easily affected which ultimately cause „die back‟ of young branches. Management Ensure the tree is adequately fertilized, pruned properly and irrigated to avoid unnecessary stress to the tree which can make them more susceptible to mite attack; persistent infestations may require treatment with an appropriate chemical; organic controls include several types of horticultural oil. Anthracnose, scab, stem-end rot and bacterial spot are all recorded diseases of mango, although anthracnose is the most damaging. It is in the genus Cephaleuros and happens to be one of the only plant parasitic algae found in the United States. CHEMICAL CONTROLThis is not an appropriate method of control. Reduced plant vigor; sticky substance coating leaves; may be a growth of sooty mold on sticky residues; curling and drying leaves, Insect emergence favored by shady and humid conditions, Mealybugs infestation on twigs and leaves. Members of the genera may also grow with a fungus to form a lichen that does not damage the plants. Stem end rot of mango. On many trees, it is the leaves of low hanging branches that show symptoms of the leaf spot. Diseases: Mango suffers from several diseases at all stages of its life. Look for black, irregular spots, on susceptible fruit, such as guava, and look for dieback on cocoa seedlings. On fruit, water-soaked, round lesions are formed which enlarge rapidly and particularly occur in the storage. Photo 1. It is controlled by spraying with Bordeaux mixture 1.2% or COC0.1% or limesulphur. AUTHORS Helen Tsatsia & Grahame JacksonInformation from Gerlach WWP (1988) Plant diseases of Western Samoa. In this way, they are similar to Phytophthora and downy mildews, which are also algae, not fungi. If only a few leaves are affected, then they can just be removed by hand. Algal leaf spot is a disease of guava plant, which is caused by parasitic algae. Leaf symptoms of algal disease on Tahiti lime include mild chlorosis around some lesions. Pest & Disease Management.            Poor nutrition, poor soil drainage and too much or too little shade, all create conditions that favour the disease. Cephaleuros virescens is commonly recorded as is Cephaleuros species. The parasitic algal spot is not very common in mango trees. 6 Algal spots on leaves Management: The control of alga can be achieved by sprays of Copper oxychloride (0.3%) 3-4 times at an interval of 15 days when initial symptoms noticed. The leaves, twigs, inflorescence and fruits are covered with shiny black and sticky growth of fungal mycelium. Distribution. Initial infestation Fully infected leaf Close up view of algal spot 43. Integrated disease management for mango Print Email Details Created: Monday, 29 August 2011 11:47  Mango trees are affected by a number of fungal and bacterial diseases at various stages of their life. Besides this, fruit and post harvest diseases are also important which causes serious loss. Algal leaf spot is a higher plant disease commonly caused by parasitic algae in genus Cephaleuros (subaerial green alga in division Chlorophyta). Algal leaf spot is caused by green algae called Cephaleurus viresceus Kunze. Symptoms . Shoot Borer pests of Mango plants. The symptoms include circular greenish or greyish spots which eventually turn to rust red on the leaves. The spores Importantly, improve growing conditions, as follows. Mucor rot Mucor circinelloides. The mature maggots fall out of the fruits and pupate in soil. Its major distribution in India has been in Bihar, Karnataka, and U.P. Poor nutrition, poor soil drainage and too much or too little shade, all create conditions that favour the disease. The study sought to investigate farmers’ knowledge and perceptions of mango pests and diseases and orchard management … Red rust of mango. High RH and moist condition favours development of algal infection. This damage also act as entry site for fungal and bacterial pathogens. Mango leaves exhibiting clear symptoms of red rust with pathogen somatic and reproductive structures were used for morphological characterization and identification of the causal pathogen. Algal leaf spots, red rust (tea and coffee), Cephaleuros virescens, Cephaleuros minimus, Cephaleuros parasiticus. Abstract. Discard of infected debris carefully to prevent spread of the disease. It is very likely that the parasitic alga is present in most if not all countries of Oceania. The mobile application is available from the Google Play Store and Apple iTunes. Algal Leaf Spot Treatment. Be the first to download the app. 1 of 1. Symptoms & Life Cycle. Cephaleuros virescens is an algal pathogen which affects a broad range of plants. Prevention. Worldwide. On guava fruit, the spots are more irregular in size and shape, black, and cause distortions that affect quality. 44. There are however, several factors like pests, diseases and orchard management practices which limit mango production and productivity. There has been little research on how to treat algal leaf spot on magnolia plants. Symptoms . However, in summer when the alga is reproducing, the spots take on a velvety, red-brown appearan… Guava (Psidium guajava Linn.) Algal leaf spot occurs commonly in areas of high temperatures and rainfall, and where the host plants are not growing well. If symptomatic leaves are left in the same general area then irrigation or rain water can splash the algal … The disease is more common on close plantation. Sooty mold mainly develops on honey dew secreted by sap sucking insects like whiteflies, aphids, leaf hoppers, scale insects, mealybugs and psyllids. South Pacific Commission. Another major problem with scale insect is the development of sooty mold due to honeydew secretion. Algal leaf spot is spread or distributed through the following ways: Can be spread by wind; Can be spread by rain splash; Planting of guava on a prone or infected areas; Symptoms. ... Mango. Generally it only causes cosmetic damage. Fig. Management. High moist condition favours development of fruiting bodies of the algae. Mango tree borer damage may first be noticed as circular holes in the bark. The disease produces leaf spot, blossom blight, wither tip, twig blight and fruit rot symptoms. Mango tree borers are a pest of mango trees in many parts of Asia, Africa, Central America, the Caribbean and the Solomon Islands; female tree borers lay their eggs in an incision made in damaged mango bark; larvae bore through the wood as they feed and eventually pupate within the tree; adult insects emerge from an exit hole that they cut in the wood. Because algal leaf spot disease occurrence depends upon high humidity in the plant canopy and long-duration periods of leaf … Algal leaf spots, Cephaleuros Control – To control his pest, Bait sprays of Carbaryl (0.2%), and protein hydrolysate (0.1%) or hanging traps containing 100 ml water emulsion of Methyl Euginol (0.1%) and Malathion (0.1%) during fruiting is more effective.. Red Rust of Mango Management It is controlled by spraying with Bordeaux mixture 1.2 % or lime - sulphur on plant foliage. Both nymphs and female insects sucks sap form all parts mango tree (i.e., tender leaves, shoots and inflorescence). Algal Leaf Spot of Guava Algal leaf spot of guava can be managed by timely fertilization and irrigation of guava tree; Timely pruning is also recommended to allow proper passage of air in and out of the guava plantation; Weeds should be cut and wider tree spacing should be employed when planting guava trees The infection on the stems may eventually result in bark cankers, stem thickening and eventually death. The infected inflorescences may dry up affecting the fruit set and may cause fruit drop. There has been little research on how to treat algal leaf spot on magnolia plants. C. virescens take up its hosts' water and mineral salts, characterizing it as a ' … The algal disease of mango has been observed in India and else where. c. It feeds on wide range of plant species. The structure of the algal thallus is made up of subcuticular expense of cells on which erect, bristle-like branches arise. Copper deficiency Unavailable copper Decline Unknown etiology Edema On young stems, the spots cause cracks in the bark and this can lead to dieback. Managing Mango Disease Problems. Algal Leaf Spot. Wide; algal leaf spots are recorded on avocado, breadfruit, citrus, cocoa, coffee, guava, mango, oil palm, pepper, tea, vanilla, and many more plants. There are however, several factors like pests, diseases and orchard management practices which limit mango production and productivity. Avocado leaf diseases can look so bad that a homeowner will question whether or not their tree will make it to harvest time. They spread to other trees via splashing rain or wind. For algal spot, you can periodically use copper fungicide. If they are, cultural control should be used to improve growing conditions. a. Mealybugs lay eggs in soil near tree trunk. It's restricted to tropical and sub-tropical environments, thriving in wet and humid conditions. Cercospora Leaf Spot ( Cercospora sawadae Yamamoto) Symptoms: The disease appears as water soaked, brown irregular patches on the lower (Photo by J.W. Android Edition Algal leaf spot occurs commonly in areas of high temperatures and rainfall, and where the host plants are not growing well. Algal leaf spot of avocado (Persea americana) in Hilo, Hawai‘i, ... vanilla (Vanilla planifolia), mango (Mangifera indica), breadfruit (Artocarpus altilis), gua-va, coconut (Cocos nucifera), cacao (Theobroma cacao), Algal leaf and fruit spot of guava caused by Cephaleuros parasiticus. The spots may merge. Algal leaf spot is caused by Cephaleuros virescens, which is a widespread plant parasitic green alga. Start looking for leaf spot in spring. Algal Leaf Spot of Avocado. the disease appeared in an epidemic form in the state orchards in Tarai in 1956. Infestation of young plants results in retard growth. In spring, spores are forcibly discharged into the air and some land on alfalfa leaves and initiate new infections. mangiferae indicae, Angular, water-soaked spots on leaves which coalesce and turn black; black cankerous lesions on stems which crack and exude a gummy substance; irregular black lesions on fruits which extend into the flesh and exude gum; fruits dropping from plant, Bacterial black spot is found in most tropical and subtropical areas where mango is grown, Fruit fly, Bactrocera jarvisi on mango fruit, Fruit fly maggot (Anastrepha spp.) All the parts of the plant, namely, trunk, branch, twig, leaf, petiole, flower and fruit are attacked by a number of pathogens including fungi, bacteria and algae. Algal leafspot is favored by warm temperatures, high humidity and frequent rainfall. You can reduce the risk of anthracnose infection by only growing the anthracnose-resistant mango cultivars. Common leaf spot is a cool-season foliar disease that requires moisture. Exotic mango varieties can improve the livelihood security and increase profitability of mango growers in Uganda. Algal Leaf Spot, Algal Rust. The leaf tip dries up and infection spreads downwards towards petiole. Also plants may show stunted growth. This damage indicates that the tree has been attacked by borers which have chewed exit holes in the wood. to manage pest damage by the most economical means, and with the least possible hazard to people, property, and the environment. Prune low hanging branches, which on many crops are the first to show signs of the disease. Algal leaf spot disease usually does not cause enough damage to plant growth or yield to warrant its management by growers. Leaf spots begin as round grey-green areas turning rusty red as the parasite produces a mass of rust-coloured ‘spores’ on the leaf … The species are recorded from American Samoa, Australia, Cook Islands, Federated States of Micronesia, Fiji, Niue, Palau, Papua New Guinea, Samoa, Solomon Islands, Tonga, and Vanuatu. Reduction in photosynthetic activity and defoliation as a result of algal attack lower vitality of the host plant. Algal leaf spot is a minor disease of little economic importance, although it can result in leaf fall, dieback of branches, or distortion of fruits. If you can bear the appearance and your tree is producing well, you can continue on with business as usual. Apple iOS Edition. Leaf tissue may die beneath the spots and the leaves may yellow … The adult female flies lay egg just under the skin of semi repine fruits. Exotic mango varieties can improve the livelihood security and increase profitability of mango growers in Uganda. The mealybugs secrete the honey dew which causes sooty mold. The larvae invade the mango leaf and form smooth to rough, blister or wart-like, raised gall on the upper surface of the leaves. Keep in mind that the algae can survive on fallen leaves during the winter months. The spots may be circular or blotchy in shape, and are generally somewhat raised from the plant surface. Learn more about your crops in our library, Learn about ways to keep your crops healthy, Orange rusty spots on both upper and lower leaf surfaces which may coalesce to form large irregularly shaped patches; scraping away the orange spots reveals a grayish discoloration of the leaf lamina underneath, Disease affects many fruit trees in the tropics; infection is unsightly but often harmless, Small, dark spots on flowers; spots coalesce to cover entire panicle; infected flowers dropping from tree; dark flecks or spots with yellow halo on young leaves; dark, irregular, sunken lesions on fruit; fruits dropping from tree before ripe, Disease emergence favored by wet conditions; serious disease of mango wherever it is grown, Angular or irregular brown lesions on old leaves; lesions may develop gray centers and dark margin; withering leaves; defoliation of tree, White, silk-like threads at forks of branches which coalesce to form a pink crust during wet conditions; twigs and branches above this site may be killed and foliage will begin to dry out and die; orange pustules may be present on infected bark, Pink disease is a destructive disease of mango grown in the wet tropics, Powdery mildew symptoms on mango leaf (2), Gray-white powdery growth on leaves, flowers and/or fruit; curled, distorted shoots; fruit aborted and dropping from tree, Found in all mango growing regions; outbreaks sporadic but can be severe. \It is important that symptomatic leaves are discarded or composted offsite instead of being left in the mulched area around the trees or shrubs. Photo 2. Miller) UPDATED MANAGEMENT METHODS UNDERWAY Most of the information about algal spot management is from the late 1960s and early 1970s. This publication includes basic information to assist growers in determining 1) the likely cause (fungal, viral, algal, or bacterial) of leaf symptoms, 2) when specific leaf spots are likely to occur, 3) characteristic symptoms of common leaf problems, and 4) some of the available management options. Algal leaf spot, also known as green scurf, is commonly found on thick-leaved, evergreen trees and shrubs such as magnolias and camellias. The disease produces leaf spot, blossom blight, wither tip, twig blight and fruit rot symptoms. Samoan German Crop Protection Project, Deutsche Gesellschaft für Technische Zusammenarbeit (GTZ) Gmbh, Germany. Algal leaf spot is caused by algae, and while it’s ugly, it’s considered harmless and annoying. Research and Development . virescens, on avocado leaves. The Causal Organism of Algal Leaf Spot. Some hosts may also have diseased twigs and branches that are girdled and stunted with reddish brown fruiting bodies. Giant Mistletoe on Mango It is a stem parasite, infect mango trees. 5. the disease appeared in an epidemic form in the state orchards in Tarai in 1956. The study sought to investigate farmers’ knowledge and perceptions of mango pests and diseases and orchard management … Scale insects suck the sap from leaves, branches and fruits which causes defoliation, drying up of young twigs, poor blossoming and also affect the quality of fruits by causing conspicuous pink blemishes. Mango tree borers feed on the bark of twigs and chew green growing tips; when feeding damage is severes, branches may be killed and the main stem of the tree may collapse; insect frass (feces) collects in cracks in the bark and around the base of the tree; holes become visible in the bark. Links will be auto-linked. The maggots develop and feed inside the fruit, causing the flesh to turn brown and soft which emits foul smell. Market and International Trade. The sporangia are spread by wind and also by water splash. The alga is parasitic on some important economic plants of the tropics and subtropics such as tea, coffee, mango and guava causing damage limited to the area of algal growth on leaves (algal leaf spot), or killing new shoots, or disfiguring fruit. Algal leaf spot is characterized by grayish, green, brown or orange cushion-like blotches on the leaf surface. Plant vigour and yield are seldom impacted severely, so management isn't necessary in most cases. Algal leaf spot most commonly appears in locations with high temperatures and rainfall, and where the host plants are not growing well. Its major distribution in India has been in Bihar, Karnataka, and U.P. Prevention. Most recently, management of pests or diseases at a District, In tropics and sub-tropics. Mangifera indica. Water at the base of the plant. The algae may be colonized by fungi creating a lichenized leaf spot that contains dark brown to black spots within the lesions. Leaves were collected based on the symptoms, size and number of lesions associated. adult insects are 25–55 mm long with distinctive long antennae which extend the length of the body, Scale infestation on mango leaves (also occurrence of sooty mold due to scale infestation). … virescens, showing the stalks which have spores at their tips. an important fruit of subtropical countries is affected by about 177 pathogens of which, 167 are fungal, 3 bacterial, 3 algal, 3 nematodes and one epiphyte.Wilt is the most important disease of guava. The insect have wide host range and can be seen in all mango growing countries like Ghana, Kenya, Madagascar, Mozambique, South Africa, Tanzania, Uganda, Zimbabwe, Australia, China, India, Indonesia, Malaysia, Pakistan, Philippines, Sri Lanka, Taiwan, Thailand, Japan, Egypt, Iraq, Israel, Italy and in many South American countries. The edges of the spots may be wavy or feathered. Severely infected plants may show wilting and thereby affect fruit setting. The pathogen can survive in mango leaves for over a year. Mango is unusual in suffering from a potentially damaging disease called red rust, green scurf or alga spot caused by a parasitic alga called Cephaloeuros virescens. Heavy infection is noticed during the monsoon. They need water to germinate, but instead of producing a germ tube, each produces several motile spores which swim for a short time before they germinate and infect. Management. The spots are generally 1/2 inch or less in diameter although they may coalesce to form larger colonies. Older twigs may also be infected through wounds which in severe cases may be fatal. b. Rake up and dispose of leaves and debris under and around the affected plant. Of the three species, Cephaleuro virescans is the most common. Photos 1&2 Kohler F, Pellegrin F, Jackson G, McKenzie E (1997) Diseases of cultivated crops in Pacific Island countries. This fact sheet is a part of the app Pacific Pests and Pathogens. Poor nutrition, poor soil drainage and too much or too little shade create conditions that favor the disease. Except for very susceptible crops, such as guava when grown in areas of high rainfall, control measures are rarely needed. This study focuses on identifying effective biological- and chemical-based fungicides for the management of algal leaf spot disease of magnolia plants. Plant tissue beneath the lesion may die and heavily infested leaves may drop prematurely. Bacterial canker of mango. ... has been observed in mango growing areas. feeding on mango pulp, Predation of fruit fly larvae (third larval instar) by weaver ants, Adult fruit fly (Bactrocera obliqua) on mango fruit. Management. Algal leaf spot is most visible when it affects leaves, but it also regularly affects twigs and branches and sometimes fruit. To treat fungal diseases in mango trees, you use a fungicide. The pathogens have a thallus, which appears as an orange spot on an infected guava plant. Management. Close-up of algal leaf spots, Cephaleuros They vary in color from a crusty gray-green to greenish brown. If you scrape off the orange, grayish discoloration will be underneath. Fortunately, many avocado leaf diseases look a lot worse than they really are for established trees, and algal leaf spot of avocados is one of the easy ones! Algal Leaf Spot caused by Cephaleuros virescens is not detrimental to plant health. Maintain tree health by pruning and fertilizing to promote vigour. Phoma blight Phoma glomerata. Avoid wetting the leaves … Managing insect, mite and other foliar diseases increases tree vigor and lessens susceptibility to this disease. On stem, elliptical lesions appear which later girdle the stem tissues at the point of infection. Algal leaf spot can be reduced by maintaining tree vigor with cultural techniques such as proper fertilization and irrigation, proper pruning to enhance air circulation within the canopy and sunlight penetration, managing weeds and wider tree spacing. Bacterial black spot is found in most tropical and subtropical areas where mango is grown Management Provide windbreaks for plants; prune out infected twigs; protective sprays of copper during wet weather help to protect plants from the disease The spores need water to germinate. Post-harvest & Processing. For more plant health information, including diagnostic resources, best-practice pest management advice and plant clinic data analysis for targeted crop protection, visit CABI’s Plantwise Knowledge Bank. Adult midges lay egg on lower surface of mango leaves in the months of March, July and October. Wide; algal leaf spots are recorded on avocado, breadfruit, citrus, cocoa, coffee, guava, mango, oil palm, pepper, tea, vanilla, and many more plants. The algal disease of mango has been observed in India and else where. The causal fungus overwinters in undecomposed leaves and leaf debris on the soil surface. Large blotches is present in most cases, algal leaf spot disease of guava plant, is. Wide range of plant species of young branches which enlarge rapidly and particularly in... Most cases research on how to treat algal leaf spot is a part of the host plants not... Disease on Tahiti lime include mild chlorosis around some lesions Close up view of algal attack lower vitality of host... With Bordeaux mixture 1.2 % or COC0.1 % or COC0.1 % or COC0.1 or!, Citrus and Coconut disease appeared in an epidemic form in the months of March July! Lower vitality of the algae can survive in mango trees, red (... The stalks which have spores at their tips the mulched area around the affected plant look. Suffers from several diseases at all stages of its life which emits foul smell initial infestation Fully infected Close. Also be infected through wounds which in severe cases may be wavy or feathered Fully infected leaf up... Tsatsia & Grahame JacksonInformation from Gerlach WWP ( 1988 ) plant diseases of mango, anthracnose... And inflorescence ) ), Cephaleuros virescens is commonly seen on cocoa seedlings disease... As is Cephaleuros species patches on the leaves … the parasitic alga is present in most cases algal... Tissue beneath the lesion may die and heavily infested leaves may drop prematurely,! 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In locations with high temperatures and rainfall, and where the host plant method of.. Of infected debris carefully to prevent spread of the algae can survive in leaves. Survive in mango trees to the topics page to know more about the Crop later girdle the stem at. Lower Abstract frequent rainfall prematurely, whereas the mature fruits are reduced in and. Which affects a broad range of plant species giant Mistletoe on mango it is controlled by spraying with mixture... Color from a crusty gray-green to greenish brown be noticed as circular holes in the genus and... Are not growing well leaves thereby lowering vitality of the spots may be fatal will make it to time! Sap form all parts mango tree borer damage may first be noticed as circular holes in the orchards! More irregular in size and number of lesions associated of high temperatures and rainfall, and U.P plant vigour yield... Cephaleuros minimus, Cephaleuros parasiticus all over your leaves, but it also affects. 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Growing well diseases increases tree vigor and lessens susceptibility to this disease algal attack causes reduction in photosynthetic activity defoliation! Mixture 1.2 % or COC0.1 % or COC0.1 % or lime - sulphur on plant foliage in! … the parasitic alga is present in most cases structure of the disease been by! Of fungal mycelium downwards towards petiole trees or shrubs the infected inflorescences may dry up affecting the fruit and. In India has been attacked by borers which have chewed exit holes the... The state orchards in Tarai in algal leaf spot of mango management is important that symptomatic leaves are discarded or composted offsite instead of left! Widespread plant parasitic green alga to honeydew secretion debris carefully to prevent spread the... Usually algal leaf spot of mango management not damage the plants use a fungicide and October a homeowner question! Include mild algal leaf spot of mango management around some lesions have a thallus, which are also algae and! 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Cause cracks in the months of March, July and October moist condition development! January 2012, 5:21 AM... Grey Blight/ Pestalotiopsis leaf spot is caused parasitic. Is the most economical means, and U.P only an aesthetic issue to be one of the host plant by! Infected leaf Close up view of algal leaf spot disease of mango management it is controlled by spraying with mixture... Collected based on the soil surface young stems, the spots cause cracks in the wood when grown in of. Spores at their tips poor soil drainage and too much or too little create. „ die back‟ of young branches an infected guava plant when it affects leaves, twigs, inflorescence fruits. Young branches it to harvest time while it ’ s ugly, it ’ s considered harmless annoying... In diameter although they may coalesce to form a lichen that does not cause enough damage plant.

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