Reghunath, PSanthosh Kumar, TKAU2019-05-172019-05-171999171541http://krishikosh.egranth.ac.in/handle/1/5810103629PGThe experiment was conducted in the Instructional Farm, College of Agriculture, Vellayani during 1997-98. The results of the pot culture experiment for studying the symptoms developed by Aphids CA. gossypii) , Thrips (S. dorsalis) and mites (P. latus) revealed that P. latus were the most serious sucking pest than aphids and thrips in the combined release. The population build up of each pest were high when released alone, while in combined release the maximum build up was recorded by mites The most prominent symptoms developed by aphids were yellowing of older leaves and reduction in the size of tender leaves and shoots. The symptoms developed by thrips were cupping, upward rolling of leaf margins, reduction in the size of leaves, brittled leaves and finally the plants became stunted. While the noticeable symptoms of mites were, downward curling of leaves, elongation of leaves, inverted boat shaped leaves, silvery lining on the ventral surface of leaves and in advanced stages the leaves and tender portions of stem became hard and brittle and finally the plants became stunted. The results obtained in the feeding efficiency study of natural enerrues recorded the efficient feeding of spiders and coccinellids on aphids. On thrips spiders were fed efficiently while coccinellids did not feed on thrips. Regarding the field experiment for the evaluation of insecticides, acaricides and botanicals and their combinations, the treatment plant extract of 1 101 A. paniculata with garlic (l 0 %) gave good control of aphids, thrips and mites resulted in maximum yield as compared to other treatments. The population build up of natural enemies was also maximum in this treatment. Neem seed oil emulsion at 10 per cent concentration was also foune! to give good control of sucking pests. Among the chemicals tested monocrotophos 0.05 per cent and malathion 0.2 per cent gave good control of three sucking pests. Regarding the combinations of bot anica Is with chemicals, neem seed oil emulsion with each one of the three chemicals gave promising results.ennullThesis