EFFICACY OF SELECTED NEEM OIL FORMULATIONS AGAINST IMPORTANT PESTS OF BRINJAL
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Date
1997
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Professor Jayashankar Telanagana State Agricultural University
Abstract
certain selected neem oil formulations against the pests of brinjal, their damage potential and natural enemies was conducted at Agricultural College Farm, Bapatla during Rabi, 1996-97 with eleven treatments replicated thrice in'a simple randomised block design. The pests and natural enemies observed were shoot and fruit borer, Leucinodes orbonalis Guen., jassid, Amrasca biguttula biguttula Ish., whitefly, Bemisia tabaci Genn.; aphid, Aphis gossypii (Glov.) and predatory beetles Verania vincta and Menochilus sexmaculatus.
The first spraying was scheduled at 40 days after planting to synchronise with the appearance of jassids, whiteflies, aphids and shoot and fruit borer. Thereafter the treatments were imposed at fortnightly interval. A total of six sprayings were imposed during the experimental period. Pest and predatory population counts were recorded one day before and one, five and ten days after each spray. The damage by shoot and fruit borer was assessed in terms of per cent infestation of shoots and fruits. The results obtained were summarised as follows. All the treatments recorded lower pest populations of all the insect pests studied and higher yields than the untreated check. Neemgold 0.25%, Neemol (1.5%) and Multineem (1.5%) recorded significantly lesser damage to shoots and fruits compared to untreated check, thus (proving their efficacy against this pest. Endosulfan proved to be highly effective against the sucking pest complex viz., jassids, aphids and whiteflies by recording significantly lower populations than untreated check. The neem formulations were found to be more safer to predatory beetles than endosulfan as they recorded higher beetle populations. Neemol (1.56) registered the maximum yield.
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D5381