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Impact of Fungicides on Bipolaris sorokiniana causing Spot Blotch Disease of Wheat under in Vitro and in Vivo Condition

Author: Vinay Kumar, Guddu Kumar*, C.S. Azad, Amarendra Kumar and Manish Raj

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Abstract

Spot blotch of wheat is caused by Bipolaris sorokiniana and it is considered as one of the emerging disease. They affect the crop at any stage right from beginning to maturity of crop and cause 25 to 35 per cent loss in yield. In present study efforts were made to find out suitable management measures through various chemicals. Under in vitro condition, propiconazole and tebuconazole gave 100 per cent growth inhibition of B. sorokiniana even at lower concentration (25 ppm). Azoxystrobin, thiram and carboxin were also found effective as compared to control Under field condition, ST by thiram + carboxin @ 2.5 g/kg of seed + FS of propiconazole @ 0.1% at boot leaf stage on Flag-1 leaf followed by second spray at 20 days interval (two sprays) proved to be best in reducing spot blotch disease at hard dough stage. Maximum seed germination per cent (96.00%) was recorded in three treatments viz., ST by thiram + carboxin @ 2.5 g/kg of seed, ST by thiram + carboxin @ 2.5 g/kg of seed + FS spr

Keywords

Spot blotch, fungicides, propiconazole, tebuconazole, Bipolaris sorokiniana.

Conclusion

•The present study revealed that under in vitro condition propiconazole and tebuconazole completely checked growth of B. sorokiniana even at 25 ppm. Azoxystrobin, thiram and carboxin were also found effective in checking the growth of B. sorokiniana. Among in vitro test of fertilizers maximum percent inhibition were recorded in urea at 1.5% i.e. 81.03%, which was at per with soluble potash (80.76%). Among in vitro test of nano compounds maximum percent inhibition (64.81%) were recorded in silver nanoparticles @ 100 ppm, which was at per with aluminium nanoparticles (55.34%). Among bio-agents Trichoderma harzianum (Th-b1), BAU isolate proved to be better in all respect over other bio-agents in dual culture technique. •Under detached leaf technique maximum incubation period and maximum disease severity was found in case of PBW 660 i.e. 6.67 days and 10.00% respectively which was followed by HD 2967 i.e. 5.67 days and 20.33 respectively. Minimum average number of lesion per lea

References

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How to cite this article

Kumar, V., Kumar, G., Azad, C.S., Kumar, A. and Raj, M. (2021). Impact of Fungicides on Bipolaris sorokiniana causing Spot Blotch Disease of Wheat under in Vitro and in Vivo Condition. Biological Forum – An International Journal, 13(3a): 441-447.