Efficacy of different fungicidal spray schedules in combating apple scab severity in Uttar Pradesh Himalayas
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Authors
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K.P. SINGH and J. KUMAR
Plant Pathology Section, Hill Campus, G.B. Pant University of Agriculture and Technology, Ranichauri 249 199
Keywords:
Spray schedules, Venturia inaequalis, antisporulant activity, disease index, infection rate, AUSPCAbstract
Five spray schedules comprising of non-systemic and systemic fungicides were evaluated against apple scab (Venturia inaequalis) in the disease prone Bhatwari fruit belt in Uttar Pradesh hills, India, over 3 consecutive growing seasons (1993-95). The fungicide tested were carbendazim, thiophanate-methyl, mancozeb, bitertanol and chlorothalonil. A pre-leaf fall urea spray was also tested. Urea applied at a concentration of 5% significantly affected V. inaequalis in overwintered leaves. All the spray schedules starting at the petal fall stage were effective in reducing primary (67.8-81.2%) and secondary (82.5-90.9%) infection on leaves and fruits. Thiophanate-methyl was the most effective in checking primary infection on 1 year growth. The variables most useful in differentiating disease incidence at various tree growth stages were infection rate (rs) and area under the scab progress curve (AUSPC).
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