(i) Diseases classified in relation to their occurrence: Study of plant dis­eases in relation to their occurrence (interaction of populations of plants, pathogens and environment) is known as epidemiology. Branch necrosis Dothiorella sp. Charcoal root rot Macrophomina phaseolina. The causal organism of citrus canker, Xanthomonas axonopodis pv. These may be crowded or scattered. Leaf curl virus infect the plants at the seedling stage and at the apical meristem. effusum. The disease has been reported from the tropical and It overseasons in the leaves, twigs and fruits lesions. Symptoms Wilt is a pernicious disease and a curse to guava industry. 3 % mustard oil proved to be repellent for the flies (Varun and Saxena, 2017). The disease is noticed on leaves, leaf stalks, stems, twigs, branches and fruits, initially producing water soaked lesions, later turning into typical canker. The pathogen extends between cuticle and epidermis and penetrates the epidermal cells. Papaya leaf curl virus is DNA virus. Fruits in the orchard as well as in storage suffer with this disease, which is, however, of rare occurrence. ), canker, wilt, die back, defoliation, twig drying, leaf spot, leaf blight, anthracnose, red rust, sooty mould, rust, seedling blight and damping off etc. CONTROL OF GUAVA DISEASES THROUGH MEDICINAL PLANTS 21. These diseases are described with respect to the causal organism and symptoms in the present paper. The tree is drought-tolerant but in dry regions lack of irrigation during the period of fruit development will cause … Handbook of Plant Disease Identification and Management presents the fundamentals of plant diseases identification based on symptomology and management focusing mainly on integrated pest management approach. Abstract — During March of 2009 uncommon leaf spot was noticed on guava trees scattered in an orchard (35 feddan) located at El-Sadat district , Menofeia governorate, Egypt. insecticide is not recommended. In India, the disease has been reported from the [anamorph] Hypoxylon serpens var. Causal organism - Xanthomonas citri. Under moist conditions, masses of spores ooze out from these pycnidia through the ostiole. On leaves, water soaked irregular satellite to angular raised lesions measuring 1-4 mm in diameter are formed. Abstract The causal organism of a stem canker disease of Limonium Mill. About 177 pathogens are reported on various parts of guava plant or associated with guava fruits, of which, 167 are fungal, 3 bacterial, 3 algal, 3 nematodes and one epiphyte. Another common causal organism affecting guava is algae, which is responsible for causing algal leaf spot in guava. About 91 pathogens are reported on fruits, 42 on foliage, 18 on twig, 18 on root and 17 fungi are isolated from surface of fruits. Wilt is one of the most distructive diseases of guava in India and loss due to this disease is substantial. is the removal, burning and destruction. DISEASES 1. psidii. 11 Mushroom root rot fruiting bodies Back to Guava Page: Anthracnose Caused by the pathogen Colletotrichum gloeosporioides Anthracnose is the most commonly observed disease … Due to it’s perishable nature number IPM SCHEDULE FOR GUAVA PESTS A. Res. The canker on fruit causes the most serious damage since they reduce B.T.Pawar . state of Karnataka, Gujarat and Uttar Pradesh. Symptoms - This is a bacterial disease, which is the most serious disease in the rainy season. 'Chorus Magenta' was recently identified and named as Phomopsis limonii I. Harvey, E. Morgan & G. Burge. About 177 pathogens are reported on various parts of guava plant of which, 167 are fungal, 3 bacterial, 3 algal, 3 nematodes and one epiphyte. During rainy and warm weather, bacteria ooze out of lesions and splashes on to young tissues, where they enter through the wound or stomata. From guava leaves and fruits lesions belongs to begomovirus of the, Viruses need suitable. 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