Neem Products for Protecting Field Cassava From Grasshopper Damage

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Abstract
Three neem products.sbd.an emulsifiable concentrate of neem oil (NOEC), neem kernel water extract (NKWE) and neem leaf water extract (NLWE).sbd.were applied on field cassava for protection against damage by the grasshopper, Zonocerus variegatus (L.). Three conventional insecticides viz. lindane 0.3%, cypermethrin 0.006% and monocrotophos 0.24% were also compared. All the neem products protected cassava for varying periods. Efficacies of NOEC and NKWE were superior to insecticides. From the results, neem products recommended to check the grasshopper damage were as follows: NOEC 0.5-2% to be applied every 8 days, NOEC 3-4% to be applied every 10 days, NKWE 7-10% to be applied every 12 days. NLWE 50% to be applied every 6 days.

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