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Impact of Sorghum on Natural Parasitism of helicoverpa armigera (hubner) by Trichogramma Chilonis IIhii in Cotton in Southern India,

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http://www.esn.ac.lk/fag/agrieast/volume_2/index.html
 
Title Impact of Sorghum on Natural Parasitism of helicoverpa armigera (hubner) by Trichogramma Chilonis IIhii in Cotton in Southern India,
 
Creator Jadhav, D R
Russell, D.
Armes, N J
Kranthi, K R
 
Subject Sorghum
 
Description Field trials were condu cted on three cotton hybrids (MECH 1, MECH 12, and RCH 2)
grown alone, and with a sorghum hybrid (CSH as a neighbouring crop at two
1)
villages, RavulapaJly and Sankeypally, in Ranga Reddy district. Cotton hybrids grown
neighbouring to sorghum had significantly higher levels of egg parasitism by
TricllOgraJrlma chilonis than in a monocrop. The enhanced level of parasitis m was
due to a temporal shift in the T. chilonis population from sorghum to cotton during
the cropping season. Paras it ism on sorghum increased slowly in relation to host egg
density at both the'village sites and reached a peak of 70% and 60% by mid-September
at Ravulapally and S a nkey pally respectively. The mean clutch size on sorghum was
2.06, w i th a maximum of 5 parasitoids emerged per egg. Parasitism of Helicoverpa
eggs on cotton by T. chilollis r eac hed a maximum of 68% in mid-October
annigera
as a neighbouring crop to sorghum and 45% as a 1110nocrop. The mean
when grown
clutch size on cotton was 2.24, with a maximum of 5 parasitoids emerged per egg.
Among the three cotton hybrids tested, parasiti9m was significantly higher on MECH 12
e i t h er grown alone or neighbouring to sorghum.The results are discllssed in terms of
the dyn a mi c s of T. chi/ollis buildup on sorghum ancl its subsequent migration to cotton
management strategy to suppress the population carryover of H. annigera on
as a
cotlon.
 
Publisher Eastern University, Sri Lanka
 
Date 2000
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/4951/1/AGRIEAST_2_06-16_2000.pdf
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