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Field evaluation of different economic threshold levels for chemical control of pink bollworm (Pectinophora gossypiella), spotted bollworm (Earias vittella, E. insulana) and cotton bollworm (Helicoverpa armigera) on cotton (Gossypium species)

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Title Field evaluation of different economic threshold levels for chemical control of pink bollworm (Pectinophora gossypiella), spotted bollworm (Earias vittella, E. insulana) and cotton bollworm (Helicoverpa armigera) on cotton (Gossypium species)
 
Creator SIMWAT, G S
DHAWAN, A K
 
Subject cotton, economic threshold levels, bollworm incidence, Gossypium spp, Pectinophora gossypiella, Earias vittella, Earias insulana, Helicoverpa armigera
 
Description  An experiment was conducted during 1993-95 for testing the performance of different economic threshold levels forcontrolling bollworms [Pectinophora gossypiella (Saund.), Earias vittella (Fabr.), E. insulana (Boisd.)J and cotton bollworm [Helicoverpa armgera (Hubner)] with insecticides. These economic thresholds included 5% bollworm incidence inintact floral formS on the plants and 5, 10 and 15% bollworm incidence in the shed floral forms, and they were comparedwith standard spray schedule. Varieties 'LH 900', 'LH 1134' and 'F 846' of upland cotton (Gossypium hirsutum L.) and'LD 327' of tree cotton (Gossypium arboreum L.) were used. The comparative performance of these treatments wasassessed by observing bollworm incidence in open bolls and recording yield of seed cotton. The pooled analysis of data(1993-94) showed that bollworm incidence in open bolls, both on boll and locule basis, was significantly higher at 5%bollworm incidence in intact floral forms than 5 and 10% bollworm incidence in shed floral forms and standard sprayschedule. But the yield of seed cotton in the former, which was on a par with that of standard spray schedule, wassignificantly higher than 5 and 10% bollworm incidence in shed floral fOfms. The cost: benefit rariq was also highest     (1· : 26.29) in 5% bollworm incidence in intact floral fonns. The pooled analysis of data (1995) revealed that the. performance of all economic threshold levels including standard spray schedule was ana par with each other regarding boll damage (8.2-10.3%), locule damage (4.3-S.6%) in open bolls and yield of seed cotton (1 490-1 678 kg/ha). The cost: benefit ratio was, however, highest in standard spray schedule (1 : 9.54), followed by 5% bollworm incidence in intaet rioral forms (1 : 7.20), 15% (1 : 6.28), 10% (1 :.5.79) and 5% (1 : 5.51) bollworm incidence in shed floral forms.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2013-05-17
 
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/29912
 
Source The Indian Journal of Agricultural Sciences; Vol 67, No 6 (1997)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/29912/13492
 
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