ESTIMATION OF YIELD LOSSES IN COTTON DUE TO MAJOR FUNGAL FOLIAR DISEASES
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Authors
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SK ROSHAN BABA*, S.L. BHATTIPROLU, V. PRASANNA KUMARI and CH. CHIRANJEEVI
Department of Plant Pathology, Agricultural College, Acharya N.G. Ranga Agricultural University, Bapatla- 522 101
Keywords:
Alternaria leaf spot, Cotton, Corynespora leaf spot, Grey mildew, Yield lossesAbstract
The experiment was conducted at Regional Agricultural Research Station, Lam, Guntur
during kharif 2019-20 to estimate the losses due to major fungal foliar diseases including Alternaria
leaf spot, Corynespora leaf spot and grey mildew in two BG II hybrids and one straight variety of
cotton. Two sprays of propiconazole @ 0.1% were applied at 60 DAS and 75 DAS; third spray
with metiram + pyraclostrobin @ 0.1% at 90 DAS and final spray of carbendazim @ 0.1% were
applied at 105 DAS. Disease observations were recorded to assess the severity of fungal foliar
diseases of cotton in protected and unprotected plots. Percent increase in unprotected plots
varied from 64.65 to 84.95, 85.77 to 87.12 and 70.59 to 78.40 when compared to plots protected
for Alternaria leaf spot, Corynespora leaf spot and grey mildew, respectively. Yield data in protected
and unprotected plots revealed that percent seed cotton yield loss of 16.14 in Jaadoo BG II,
20.34 in RCH 2 BG II and 26.28 in L 1060. The highest ICBR was obtained for Jaadoo BG II
(26.61) when compared to RCH 2 BG II (19.95) and L 1060 (19.46).
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