Abstract
Aphid Aphis gossypii Glover was found to be the major pest of isabgol in the semi-arid regions of the Rajasthan. The infestation of aphid initiated from 2nd standard meteorological week (SMW) with 6 aphids/ plant and fluctuated till 13th SMW. The peak activity of aphids observed on 8th SMW which gradually reached to the level of 56.13 aphids/ plant and thereafter gradually decreased up to 7.87 aphids/plant in the fourth week of March when the crop matured. The activities of three coccinellid beetles viz. Brumoides suturalis Fabricius, Cheilomenes sexmaculata Fabricius and Coccinella septempunctata Fabricius were also studied, and their peak population was noticed from 8th to 10th SMW (19th February to 5th March, 2022). The significant positive correlation of aphid population was found with bright sunshine and all three species of coccinellids. C. sexmaculata and C. septempunctata have the significant positive correlation with bright sunshine, maximum temperature and average temperature while negative non-significant correlation with relative humidity.
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