Comparative Incidence of Okra Shoot and Fruit Borers and Their Management
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Date
2017
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Publisher
MPUAT, Udaipur
Abstract
The investigation on “Comparative incidence of okra shoot and fruit
borers and their management” was conducted at the Instructional Farm, Rajasthan
College of Agriculture,Udaipur during kharif 2015. Okra variety JKOH-7315 was
sown on three staggered dates of s 25th June, 25th July and 25th August to compare the
incidence of the borers. The maximum shoot damage was recorded after 8 weeks of
crop duration. Among dates of sowing, the timely sown crop recorded highest shoot
borer infestation with the mean damage of 14.93 per cent; while the late sown crop
recorded lowest shoot borer infestation with the mean damage of 12.92 per cent. The
maximum fruit damage was recorded after 11 weeks of crop duration. The timely
sown crop recorded highest fruit borer incidence with the mean damage of 28.45 per
cent; whereas, the late sown crop recorded lowest fruit borer incidence with the mean
damage of 22.53 per cent.
The bio-efficacy of five synthetic insecticides, one bio-agent and one biopesticide
was evaluated against the shoot borer and fruit borers of okra. All the
treatments were superior over control in terms of mean shoot damage and fruit
damage. Among the synthetic chemical pesticides two applications of emamectin
benzoate 5 SG (200g/ha) was most effective with mean shoot damage of 9.90 per
cent, while the least effective treatment was fenvalerate 20 EC (375 ml/ha) with mean
shoot damage of 19.12 per cent. Similarly, against fruit borers emamectin benzoate 5
SG (200g/ha) was most effective with 12.51 per cent fruit damage; whereas, the least
effective treatment was permethrin 25 EC (500ml/ha) with mean fruit damage of
19.11 per cent. The bio- agent Trichogramma chilonis Ishii released at the rate of 1.0
lac per hectare followed by the bio-pesticide HaNPV [250 LE/ha] after 10 days was
more effective than untreated control.
Description
Comparative Incidence of Okra Shoot and
Fruit Borers and Their Management
Keywords
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Citation
Dhaker and Rana, 2017