Relative efficacy of novel insecticides against sucking insect pests of okra [Abelmoschus esculentus (L.) Moench]
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Date
2011
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MPUAT, Udaipur
Abstract
A field experiment was conducted on “Relative efficacy of novel insecticides against
sucking insect pests of okra [Abelmoschus esculentus (L.) Moench]” at Rajasthan College of
Agriculture, Udaipur during July to October, 2010.
The aphid Aphis gossypii (Glover), jassid Amrasca biguttula biguttula (Ishida) and
whitefly Bemisia tabaci (Gennadius) were recorded to infest okra crop throughout the
growing season. The incidence of aphid, A. gossypii (Glover) was initiated in the second
week of August. While, jassid, A. biguttula biguttula (Ishida) and whitefly, B. tabaci
(Gennadius) in okra was commenced in fourth week of July. Aphid, jassid and whitefly
touched the peak during fourth week of August (86.5 aphids/ten plants), first week of October
(15.4 Jassids/ten plants) and first week of September (6.9 whiteflies/ten plants), respectively.
The aphid and whitefly exhibited a positive correlation with temperature, relative
humidity and negative correlation with total rainfall. However, the correlation was non
significant. While, the correlation between jassid and temperature, relative humidity and
rainfall was significantly negative.
Among different treatments, two spray of Imidacloprid 40%+ Fipronil 40% 80 WG @
100g/ha at 15 days interval were found significantly superior over all the treatment in terms
of mean reduction in the population of sucking insect pests. It recorded mean marketable
yield of 183.43q/ha which was significantly higher than all the treatments. Fipronil 80WG @
50g/ha and Imidacloprid 200SL @ 200ml/ha followed the above treatment. None insecticides
were found to cause phytotoxicity in okra.
Description
Relative efficacy of novel insecticides against sucking
insect pests of okra [Abelmoschus esculentus (L.)
Moench]
Keywords
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Citation
Chundawat and Ameta, 2011