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        <dc:title>Impact of Sorghum on Natural Parasitism of helicoverpa armigera (hubner) by Trichogramma Chilonis IIhii in Cotton in Southern India, </dc:title>
        <dc:creator>Jadhav, D R</dc:creator>
        <dc:creator>Russell, D.</dc:creator>
        <dc:creator>Armes, N J</dc:creator>
        <dc:creator>Kranthi, K R</dc:creator>
        <dc:subject>Sorghum</dc:subject>
        <dc:description>Field trials were condu cted on three cotton hybrids (MECH 1, MECH 12, and RCH           2)&#13;
grown alone, and with a sorghum hybrid (CSH                 as a neighbouring crop at two&#13;
                                                         1)&#13;
villages, RavulapaJly and Sankeypally, in Ranga Reddy district. Cotton hybrids grown&#13;
neighbouring to sorghum had significantly higher levels of egg parasitism by&#13;
TricllOgraJrlma chilonis than in a monocrop. The enhanced level of parasitis m was&#13;
due to a temporal shift in the T. chilonis population from sorghum to cotton during&#13;
the cropping season. Paras it ism on sorghum increased slowly in relation to host egg&#13;
density at both the'village sites and reached a peak of 70% and 60% by mid-September&#13;
at Ravulapally and S a nkey pally respectively. The mean clutch size on sorghum was&#13;
2.06, w i th a maximum of 5 parasitoids emerged per egg. Parasitism of Helicoverpa&#13;
              eggs on cotton by T. chilollis r eac hed a maximum of 68% in mid-October&#13;
annigera&#13;
                 as a neighbouring crop to sorghum and 45% as a 1110nocrop. The mean&#13;
when grown&#13;
clutch size on cotton was 2.24, with a maximum of 5 parasitoids emerged per egg.&#13;
Among the three cotton hybrids tested, parasiti9m was significantly higher on MECH 12&#13;
e i t h er grown alone or neighbouring to sorghum.The results are discllssed in terms of&#13;
the dyn a mi c s of T. chi/ollis buildup on sorghum ancl its subsequent migration to cotton&#13;
         management strategy to suppress the population carryover of H. annigera on&#13;
as a&#13;
cotlon.&#13;
</dc:description>
        <dc:publisher>Eastern University, Sri Lanka</dc:publisher>
        <dc:date>2000</dc:date>
        <dc:type>Article</dc:type>
        <dc:type>PeerReviewed</dc:type>
        <dc:format>application/pdf</dc:format>
        <dc:language>en</dc:language>
        <dc:identifier>http://oar.icrisat.org/4951/1/AGRIEAST_2_06-16_2000.pdf</dc:identifier>
        <dc:identifier>  Jadhav, D R and Russell, D. and Armes, N J and Kranthi, K R  (2000) Impact of Sorghum on Natural Parasitism of helicoverpa armigera (hubner) by Trichogramma Chilonis IIhii in Cotton in Southern India,.  AGRIEAST: Journal of Agricultural Sciences, 2.  pp. 6-16.  ISSN 0309-877X     </dc:identifier>
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