National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
In this experiment, different districts of South Gujarat were closely examined for various diseases in different cultivars. A roving survey was conducted on cultivars’ field during the crop season and a fix point survey on cotton was conducted periodically at Research farm. On Research farm, periodical observations were recorded on G. Cot. Hy. 12 which revealed that bacterial blight appeared during the 2nd week of July (2.0 %) and then gradually developed and reached at its peak (23.5 % PDI) during the 3rd week of September and then declined, but prevailed up to 1st week of December. Observations were also recorded on other cultivars. The susceptible cultivars viz., LRA 5166 showed bacterial blight intensity to the tune of 2.5 to 23.0 per cent PDI moreover, non Bt cotton was more susceptible to the bacterial blight disease. During 30 - 45 DAS (vegetative stage of the crop), the BLB was more pronounced on lower leaves. Roving survey was conducted in Surat, Bharuch and Narmada districts on farmers’ field. The BLB incidence was found in the range of 0.0 to 5.5 %, 0.0 to 3.0 % and 0.0 to 24.0 % PDI in Surat, Bharuch and Narmada districts, respectively on fields, majority of them were growing approved BG II hybrids. Moreover, Alternaria leaf spot was observed in the range of 0.0 to 13.5 % in Nandod taluka of Narmada district (Kuta Amba village). Whereas, in other two districts viz., Surat and Bharuch, it was in the tune of 0.0 to 2.0 % and 0.0 % PDI, respectively.
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