volume 36 issue 3 (september 2002) : 14.9 - 155
EFFECT OF ENVIRONMENTAL FACTORS ON POWDERY MILDEW SEVERITY IN FIELD PEA UNDER IRRIGATED AND RAINFED CONDITIONS
1Indian Institute of Pulses Research,
Kanpur - 208 024, India
ABSTRACT
Per cent severity of Erysiphe pisi, DC on Pisum sativum var. Type 163 leaves was studied at three seedling dates under irrigated and rainfed conditons. Severity was higher under rainfed and significantly varying under seeding dates and crop growth stages. Path analysis and per cent association estimation showed that severity is affected by minimum environmental temperature and maximum relative humidity. Under irrigated condition, maximum severity was under 37.4°C, 19.4°C, 53.0%, 25.0% and 11.8h, while under rainfed condition. It was under 37.0°C. 23.8°C 51.4%,25.0% and 11.9h (for maximum temperature minimum temperature, maximum relative humidity, minimum relative humidity and sunshine duration, respectively). Multiple correlation for severity under irrigated and rainfed conditions were 0.943 and 0.882, respectively
KEYWORDS
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Indian Journal of Agricultural Research
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