STUDIES ON NEED BASED CONTROL OF COTTON BOLLWORMS UNDER RAINFED AND IRRIGATED CONDITIONS

A. P. SAMALO; S. RAM; AND H. P. PATNAIK

doi:https://doi.org/10.29321/MAJ.10.A02178

Madras Agricultural Journal

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STUDIES ON NEED BASED CONTROL OF COTTON BOLLWORMS UNDER RAINFED AND IRRIGATED CONDITIONS

Author: A. P. SAMALO, S. RAM, AND H. P. PATNAIK,

p-ISSN: 0024-9602, e-ISSN:2582-5321, Vol: 74, Issue: jun-jul,

DOI:https://doi.org/10.29321/MAJ.10.A02178

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Abstract

Based on the economic threshold level (5% boll worm infestation) the number of insecticidal sprays could be minimized to 2 in case of decamethrin and fenvalerate, 3 In case of chlorpyriphos, 4 in case of monocrotophos and endosulfan and 5 in case of carbaryl. Irrigated HX 11 protected with decamethrin @ 0.1 kg a. ijha at 53 and 88 days after sowing (DAS) gave highest yield (1978 kg/ha) of seed cotton at against 980 kg in the untreated chock. The corresponding yields in NCT 19 were 1031 and 671 kg/ha. Timely irrigation alone increased the seed cotton yield by 44.9 % in HX 1 and 36.8% in NCT 19 over the rainfod crops.

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