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Birsa Agricultural University, Ranchi

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Subject: Agricultural Entomology × End date: 1997 × Start date: 1993 × Type: Thesis ×
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    ThesisItemOpen Access
    Effect of Intercropping and Insecticides on Pest Complex of Cauliflower with Particular Reference To Diamond Back Moth
    (Birsa Agricultural University, Ranchi, 1997) Sanjay Kumar Sethi; Ravindra prasad
    The present Investigation entitled “Effect of intercropping and insecticides on pest complex of cauliflower with particular reference to diamond back moth” was conducted in the insecticides compound of Birsa Agriculture University, Ranchi Bihar in the winter season of 1996-1997. During the course of investigation it was observed that significantly lower incidence of pest – complex viz. diamond back moth (DBM), aphid and the Bihar hairy caterpillar were recorded on cauliflower when it was intercropped with either marigold or coriander as compared with that of sole crop of cauliflower. Significantly the highest suppression of DBM the Bihar hairy caterpillar were recorded when foliar spraying of cypermethrin @ 0.1 Kg a.i/ha, applied over the crop thrice of three weeks interval all most remains at par with that of quinalphos and B.t. K. ( delfin) @0.5 Kg a.i/ha and0.75 kg/ha respectively . However ,aphid (Bravicoryne brassicae L.) was most effectively suppressed by three foliar spraying with cypermethrin @0.1 Kg a.i/ha applied at three weeks interval .B.T. K. (Delfin) was found to be ineffective against aphid. The interaction between intercropping and insecticides were found significantly effective in suppressing the population of DBM and the Bihar hairy caterpillar throughout the experimental period , however ,it was found significantly in respect of reduction in aphid population only up to 5 days after each of the three spraying with only to insecticides viz. quinalphos @0.5 kg a.i/ha and cypermethrin @ 0.1 kg a.i. /ha. Intercropping showed no any significantly effect on yield of cauliflower, though apparently higher yield (172 q/ha) was obtained when cauliflower was intercropped with coriander as compared to that of sole crop (156.68q/ha). Cypermethrin , quinalphos and B.t.k (Delfin) proved superior over untreated control and being at par among themselves on terms of yield . However, the highest yield (188.33 q/ha) was obtained when the crop was treated with cypermethrin and the lowest yield (117.42 q/ha) obtained when the crop was left untreated. The interaction between intercropping and insecticides proved signific