Impact of neem-based insecticides on beneficial arthropods in cotton ecosystem
2001
Mann, G.S. | Dhaliwal, G.S. (Punjab Agricultural University, Ludhiana (India). Department of Entomology)
The effect of neem formulations based on azadirachtin content (NeemAzal, Rakshak Gold ICIPE Neem 1% each) was evaluated against beneficial arthropods in cotton agroecosystem. Parasitization of Bemisia. tabaci by Encarsia spp. in neem-based insecticides was recorded to be minimum (4.1%) in Rakshak Gold @ 2 l/ha which was at par with control (4.5%). However, triazophos recorded very strong detrimental effects with 0.86% parasitization. Number of spiders 15 plants were recorded significantly maximum (5.00) with NeemAzal 1 l/ha than that of control (3.00) to be minimum (3.32) in NeemAzal 2 l/ha. However, triazophos with 0.66 coccinellids/15 plants proved highly toxic. Chrysopids/15 plants were recorded to be minimum (1.40) in Rakshak Gold 2 l/ha which was significantly lower than that of 7.0 in control.
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