Papers

STUDIES ON BACTERIAL LEAF BLIGHT OF COTTON (GOSSYPIUM SPP) (Pages : 25 - 29)

ASTHA SINGH, S.S.L. SRIVASTAVA AND M. AKRAM

Bacterial leaf Blight of cotton is a major seed borne foliar disease that attacks the crop at all growth stages. Research studies were conducted in the Oilseed Research Farm, Student Research Farm of Chandra Shekhar Azad University of Agriculture and Technology, Kanpur. The lab experiments were carried out in the Plant Pathology Department laboratory. The objective was to screen the commonly used varieties of cotton for resistance, assay the pesticides efficacy against the pathogen and to determine the media for optimum growth of the pathogen to conduct lab studies. In media studies for the best growth of the pathogen it was found that Nutrient broth supported the best growth of the bacterium followed by Muller Hinton agar. Good growth was obtained in case of Potato sucrose peptone and Ayer, Rupp and Johnson media. In the screening of varieties grown commercially in North India against the pathogen out of 40 varieties none was free from this disease. However, 6 varieties were resistant namely Lohit, Shyamli, Acala 3080, LD 419, RG 8, CAD 4, 10 were moderately susceptible and rests were susceptible under natural conditions to this disease. The efficacy of 12 fungicides and 2 antiseptics was tested by disc plate method against the bacterium. Thiram, Mercuric chloride, Carbendazin + Mancozeb, Bavistin, Captan and Formaldehyde gave good results in ascending order. The efficacy of 7 was tested against the pathogen out of which streptomycin and chloramphenicol gave best results. Download


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