Management of Fungal Foliar Diseases of Bt. Cotton

Author: Kulkarni V.R. and Sabeena I.B.

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Abstract

Cotton is an important commercial crop vulnerable to many foliar diseases, among them grey mildew and Alternaria leaf blight are most severe and frequently occurring diseases and responsible for major yield loss. In recent years combiproducts are available in the market to manage more than one disease by using single chemical. So efforts were made to evaluate the combiproducts to manage the two important cotton fungul foliar diseases like Alternaria blight and grey mildew a field experiment was carried out under rainfed situation at agricultural research station Dharwad during 2017-18 and 2018-19. The Pooled and economic analysis of the two years data revealed that, three sprays of Trifloxystrobin 25% + Tebuconazole 50% @ 0.5g/l on 60, 75 and 90 DAS was found effective in management of Alternaria leaf blight and grey mildew diseases of Bt. cotton. Whereas the PDI of Alternaria leaf blight was 11.41% and grey mildew was 6.82% with highest yield of 1702.68 kg/ha and also gave B:C attractive ratio (2.05) with more net returns in comparison with control. Whereas, control recorded PDI of 46.11% and 36.30% for Alternaria leaf blight and grey mildew respectively by recording lowest yield (939.67 kg/ha). The spraying of Trifloxystrobin 25% + Tebuconazole 50% @ 0.5g/l can be recommended as one of component of integrated management of both the diseases in cotton.

Keywords

Alternaria blight, grey mildew, PDI, benefit cost ratio

Conclusion

Trifloxystrobin 25% + Tebuconazole 50% @ 0.5 g/l was found cost effective with high cost benefit ratio of 2.05, followed by Propiconazole 25% EC @ 1.0 g/l (1.99). Whereas, Difenconazole 25% EC @ 1.0 g/l was least cost effective with cost benefit ratio of 1.65:1.

References

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How to cite this article

Kulkarni V.R. and Sabeena I.B. (2023). Management of Fungal Foliar Diseases of Bt. Cotton. Biological Forum – An International Journal, 15(1): 24-27.