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Economic threshold for chemical control of spotted bollworms (Earias vittella and E. insulana) and pink bollworm (Pectino phora gossypiella) on tree cotton (Gossypium arboreum)

Indian Agricultural Research Journals

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Title Economic threshold for chemical control of spotted bollworms (Earias vittella and E. insulana) and pink bollworm (Pectino phora gossypiella) on tree cotton (Gossypium arboreum)
 
Creator Singh, Jai
Sandhu, B S
 
Subject —
 
Description An experiment was conducted during 1991-93 to study the control of spotted bollworms [Earias vittella (Fabr.) and E. insulana(Boisd.)] and pink bollworm [Pectinophora gossypiella (Saund).] based on bollworm population or infestation level in fruitingbodies of tree or desi cotton (Gossypium arboreum L.). Fenvalerate (50 g al/ha) alternated with quinalphos (0.5 kg ai/ha) wasused in all the treatments. Six sprays of these insecticides in the recommended criterion (spray at 10-day intervals startingfrom squaring on 25% plants till Z weeks before the first picking) on cotton controlled the bollworms most efficiently, asthe highest seed-cotton yield (1 718 kg/ha) as well as net income (Rs 23 375/ha) were obtained under this treatment.Insecticidal sprays at 5% incidence in freshly shed fruiting-bodies (5 sprays) was the next in effectiveness. Sprays done atstage of 2 larvae/plant and 10% incidence in intact fruiting-bodies on plant were found the least effective.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2012-06-05
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/18981
 
Source The Indian Journal of Agricultural Sciences; Vol 65, No 8 (1995)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/18981/9335
 
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