SCREENING COTTON GERMPLASM AGAINST CORYNESPORA LEAF SPOT
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Authors
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P. MOUNIKA
Department of Plant Pathology, Agricultural College, Bapatla- 522 101 Acharya N.G. Ranga Agricultural University, Andhra Pradesh
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S. L. BHATTIPROLU
Department of Plant Pathology, Agricultural College, Bapatla- 522 101 Acharya N.G. Ranga Agricultural University, Andhra Pradesh
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S. KHAYUM AHAMMED
Department of Plant Pathology, Agricultural College, Bapatla- 522 101 Acharya N.G. Ranga Agricultural University, Andhra Pradesh
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M. SREEKANTH
Department of Plant Pathology, Agricultural College, Bapatla- 522 101 Acharya N.G. Ranga Agricultural University, Andhra Pradesh
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P. ANIL KUMAR
Department of Plant Pathology, Agricultural College, Bapatla- 522 101 Acharya N.G. Ranga Agricultural University, Andhra Pradesh
Keywords:
Corynespora leaf spot, Cotton, Germplasm, Resistant, ScreeningAbstract
Corynespora leaf spot of cotton is an important foliar disease infecting leaves, stems, squares and bolls. Severe defoliation is the principal effect of this leaf spot, thus affecting the yield. Identification of resistant cotton varieties/hybrids is an important disease management strategy. Hence a study was conducted to screen cotton germplasm against Corynespora leaf spot in comparison to a popular hybrid (Jaadoo BG II) and two straight varieties (NDLH 1938 and L 1060) during kharif 2021-2022 at Regional Agricultural Research Station, Lam, Guntur, Andhra Pradesh. The disease was recorded at different stages of crop viz., seedling, squaring, flowering, boll formation and boll development, boll maturity and bursting and picking stages by adopting standard disease scale of 0-4 and per cent disease index (PDI) was calculated. Boll formation and boll development was found to be the most susceptible stage of the crop as the entries recorded the highest PDI. Out of 150 entries, 68 scoring less than 10.0 PDI were considered resistant for further testing against Corynespora leaf spot. In check entries, Jaadoo BG II (4.25 PDI), NDLH 1938 (4.50 PDI) and L 1060 (6.50 PDI) the disease appeared at seedling stage itself and reached peak of 28.75, 31.25 and 41.25 PDI at boll formation and development stage expressing susceptibility.
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