Impact of groundnut crop based intercropping system on insect pests and their natural enemies
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UASD
Abstract
Impact of groundnut crop based intercropping system on insect pests and their natural
enemies were studied during Kharif 2013 at Main Agricultural Research Station, Dharawd. The
intercrops such as bajra, sorghum, cowpea, lucerne, foxtail millet, chilli and sunflower were sown at
3:1(groundnut : intercrop) ratio to study their impact on the population of insect pests and their natural
enemies on groundnut. The lower incidence of insects (Spodoptera, leafhopper, thrips) were recorded
in groundnut + foxtail millet, followed by groundnut + bajra and groundnut + sorghum intercropping.
Groundnut+ sorghum intercropping recorded least Percent Disease Index (PDI) of both early and late
leaf spot disease, which was followed by groundnut +foxtail millet and groundnut+bajra intercropping.
The highest population of coccinellids and predatory spiders were recorded in
groundnut+foxtail millet followed by groundnut+bajra and groundnut+sorghum intercropping. Highest
percent parasitisation (22.33%) due to Apanatlees. ssp and Campolities chlorideae and higher natural
incidence of N. rileyi (14.05%) was found at 60 days after sowing (DAS). Highest percent
parasitisation of Spodoptera larvae was recorded in groundnut + lucerne, followed by groundnut +
foxtail millet, groundnut + bajra and groundnut + sorghum intercropping. Where as highest incidence
of N. rileyi was recorded in groundnut + cowpea intercropping and was at par with groundnut +
lucerne intercropping.
The highest Spodoptera larval mortality was recorded at 10 days after N. rileyi spray in
groundnut + cowpea intercropping was at par with groundnut + lucerne intercropping. Groundnut +
foxtail millet intercropping yielded maximum (27.33q/ha) followed by sole groundnut crop (26.20q/ha),
groundnut + bajra (26.00q/ha) and groundnut + sorghum (24.33q/ha). The present result indicates
that some of the crop combinations will enhance the epizootics of N.rileyi by providing suitable
microenvironment for their higher activity. The highest economic return was recorded in groundnut +
foxtail millet, followed by groundnut + bajra and groundnut + sorghum.
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