INVESTIGATION ON THE FEEDING, DEVELOPMENT AND REPRODUCTIVE POTENTIAL OF JASSID, AMRASCA BIGUTTULA BIGUTTULA ISHIDA AND ITS MANAGEMENT IN COTTON
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Date
2001
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AAU, Anand
Abstract
Various field and laboratory experiments were conducted which include screening of some of the cotton genotypes/cultivars against jassid,A. biguttula biguttula in field conditions, bio-efficacy of new molecules of synthetic insecticides against cotton jassid, response of oviposition behaviour of jassid to botanicals, determination of causes of resurgence in jassid due to insecticides, biochemical study of cotton leaves as well as effect of quinalphos, iriazophos and monocrotophos on the development of jassid, morphological and biochemical basis of resistance of various cotton genotypes/cultivars against jassid and evaluation of various plant materials and insecticide schedules for the management of jassid, A. biguttula biguttula on cotton H-6 at Department of Entomology, Bansiial Amrutlal College of Agriculture, Gujarat Agricultural University, Campus Anand during 1997 to 2000. The activity of jassid, A. biguttula bigutiula was found on okra, brinjal, castor, groundnut, ciusterbean and cowpea, whereas lucerne and mung remained completely free from jassid infestation. A weed plant kanski (Abuiiton indicus (L.) SW) found infested by jassid. Okra was the most preferred host by jassid. The activity of jassid, A. bigutiula biguttula on cotton H-6 was observed from 1st week of August to 4th week of December with its peak during 1st week of September. The temperature (minimum and mean), vapour pressure (morning, afternoon and mean), relative humidity (after noon) and mean relative humidity influence the jassid activity. The nymphal population of jassid, A. biguttula biguttula remained higher on middle leaves than upper and lower leaves on cotton H-6. Among different genotypes/cultivars, G. cot.-10 was found with low susceptibility, whereas genotype BC-2000-1 and cultivar Gujvin showed higher susceptibility to cotton jassid, A. biguttula biguttula. The leaves of cultivar G. cot.-10 had lowest oviposition, whereas genotype BC-2000-1 had higher oviposition by jassid. The G. cot.-10 had lower jassid nymphal population due to low content of sugar, chlorophyll, protein and amino acids and higher phenol as well as higher hair density on lower leaf lamina and mid rib with longer hairs. Longer oviposition period with higher fecundity, adult emergence, adult duration and male : female ratio with a shorter nymphal duration of jassid were observed on cotton plants protected with quinalphos, triazophos and monocrotophos. The higher rate of resurgence of jassid population was observed on cotton plants sprayed with quinalphos 0.1%. The content of chlorophyll, sugar, protein, amino acids and moisture have shown positive relationship with build up of jassid population, while phenol content has negative relationship. Among the new insecticide molecules indoxacarb 0.015%, etofenprox 0.005% and acetamiprid 0.0063% were found superior against jassid, whereas among new formulations of E.G. and granular insecticides, fohar application of imidacloprid @ 0.03 kg a.i./ha, carbosulfan @ 0.3 kg a.i./ha and soirapplication of carbofuran @ 1.0 kg a.i./ha found effective and economical. Spray of neem, (Azadirachta indica A. Juss) seed kernel suspension or ardusa, {Alianthus excelsa Roxb.) leaves suspension at 3% concentration and neem leaves suspension at 6% concentration were found effective for their oviposition deterrent property against jassid. Schedule (S2) consisting of acetamiprid 0.0063% followed by neem seed kernel extract in methanol 1% followed by acetamiprid 0.0063% followed by neem seed kernel extract in methanol 1% recorded higher seed cotton yield, however highest ICBR (1:7.39) was registered by schedule (S6) consisting of neem seed kernel extract in methanol 1% followed by dimethoate 0.03% followed by neem seed kernel suspension 5% followed by dimethoate 0.03%.
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AGRICULTURAL ENTOMOLOGY, AGRICULTURE, INVESTIGATION