Discipline of Plant Pathology . Guava wilt is a dramatic and devastating disease of plants that usually becomes noticeable with the onset of the rainy season. These insects mostly belong to the Coleoptera and Lepidoptera. Indian Phytopathology, 48: 86–89. CAUSAL ORGANISM. psidii and F. solani are the important causal organism of guava wilt. Wilt disease of guava: a national problem. Guava wilt disease appeared soil borne and may spread through nursery stock grown in contaminated soil and ... regarding isolation of putative causal organism of GWD across Punjab province and its cytological and genetic characterization in Pakistan has been reported. ... CHAPTER 2: ISOLATION OF THE CAUSAL ORGANISM OF GUAVA WILT DISEASE, AND It have been reported by different workers (Das Gupta and Rai, 1947; Dey, 1948; Prasad et al., 1952; Edward and Srivastava, 1957). Guava wilt and cotton wilt 1. They affect cereals and fruits sun as Banana, sugarcane, and tomatoes. Chibber, H.M. 1911. and Mathur, K. 1980. Nigel Mark Grech . In India the disease was first recorded near Allahabad in 1935 . KEYWORDS: fungal diseases \ Psidium guajava \ Wilt Guava Doctor of Philosophy in Plant Pathology . The modes of infection, causal organisms, and environmental and chemical factors that guide the development of the disease have also been emphasised. Fusarium spp., one of the most important pathogens which causes wilt disease of guava (P. guajava L.) is a major threat to guava cultivation (Misra and Pandey, 1996; Misra, 2006). Basic requirements Guava is mainly grown in the tropics and will tolerate temperatures between 15 and 45°C (59–113°F). The infection was reported 15 - 30 %. Investigation on wilt disease of guava (. The plant may develop light yellow leaves and sag noticeably, prematurely shed fruits or defoliate entirely. Guava will grow optimally between 23 and 28°C (73–82°F) but established trees can tolerate short periods at -3 to -2°C (27-28°F) although temperatures below 15°C (60°F) can cause the tree to cease producing fruit. Wilt is a pernicious disease of guava in India. The disease is a serious threat to guava cultivation in U.P. Production of pectolytic and cellulolytic enzymes. Misra, A.K., Om Prakash and Pandey, B.K. of . Stem borer of guava is one of the group of insect pests that bore or feeds on the stem of guava plant and cause damage or reduce the growth rate and productivity of guava plant. Some chemical changes in guava fruits infected by. STUDIES ON GUAVA WILT DISEASE . 1968. Different workers have reported the causal organism of guava wilt but with varying results. Several plant pathologists have reported that Fusarium oxysporum f. sp. Wilt. Causal Organism of Guava Stem Borer. The name Fusarium oxysporum f. psidii is proposed for the causal organism. 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