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The study investigated the prevalence of major insect pests and their natural enemies in Blackgram crops, focusing on leaf hoppers, whiteflies, Bihar hairy caterpillars, spotted pod borers, stem flies, coccinellids and spiders. Throughout the crop period, the population dynamics of these pests were monitored, revealing varying levels of infestation. The high population of 5.60 leafhoppers per plant and 3.50 larvae per plant of Bihar hairy caterpillar were recorded during 35th week of the crop cycle. The high population of 6.90 whiteflies per plant, 2.60 spotted pod borer larvae per plant and 60 per cent of pod fly infestation were observed during 36th, 37th and 38th week of the crop cycle, respectively. The highest populations of coccinellids 2.40 beetles per plant in 35th week and 2.00 spiders per plant in 36th week recorded duringthe crop cycle. The maximum temperature and relative humidity showed significant positive correlation and minimum temperature and rainfall showed negative non-significant correlation with the population of leaf hopper, Bihar hairy caterpillar, whitefly, stem fly, spotted pod borer and coccinellids. Relative humidity showed positive significant correlation and maximum temperature, minimum temperature and rainfall showed negative non-significant correlation with population of spider.
Choudhary et al. (Mon,) studied this question.
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