Asian Journal of Bio Science

Abstract

The present investigation was conducted during Rabi season of 2013 –ecofriendly management of mustard aphid (Lipaphis erysimi kalt.) on mustard (Brassica juncea L.) at Research field, Naini, Allahabad using Randomized Block Design (RBD) method in three replications. The seven treatments namely cypermethrin 25EC, marigold leaf 5 per cent, cow urine 17 per cent, neem oil 0.1 per cent, neem leaf extract 5 per cent,Calotropis procera leaf 5 per cent , kinnow leaf 5 per cent as treatments were used to check their efficacy against mustard aphid (Lipaphis erysimi Kalt.) on mustard. The observations on infestation of Lipaphis erysimi(Kalt.) 24 hours before (pre – treatment) and 3^rd, 7^th and 14^th day after treatment (post – treatment) at two spraying were recorded for computing the mean aphid infestation. The data were subjected to statistical analysis (ANOVA) after appropriate transformation for interpretation. Insecticides treatments were applied as respective two sprays which revealed that the application of insecticides, significantly decreased the aphid infestation in 3 and 7 days and significantly 14 days resulted better performance. The minimum aphid infestation was observed with the cypermethrin 25EC (69.87), neem oil 1 per cent (68.01), marigold leaf 5 per cent (67.96) neem leaf extract 5 per cent (46.79),Calotropris procera leaf 5 per cent (46.52),cow urine (63.46) and kinnow leaf 5 per cent (60.59), minimum aphid infestation was observed it was also superiorly significant and more effective as compared to all other treatments. The data regarding seasonal incidence was also recorded and the highest population of mustard aphid (Lipaphis erysimi Kalt.) commenced from 4^th standard week (January last week) with an average 4 aphids/plant. The aphid population increased and gradually reached peak level of 51.15 aphids/plant at 8^th standard week (February third week). The highest yield (15.75 q/h) was noticed in cypermethrin 25 EC followed by neem oil 1 per cent (14.50 q/h) marigold leaf 5 per cent ( 12.90), neem leaf extract 5 per cent (9.25), Calotropris procera leaf 5 per cent (8.40 q/h), cow urine 17 per cent (8.20), kinnow leaf 5 per cent (7.08) over 5.80 q/h yield of untreated control. The best cost benefit ratio was obtained with cypermethrin 25EC (1:3.10), neem oil 1 per cent (1:2.64), marigold leaf 5 per cent (1:2.38) neem leaf extract 5 per cent (1:1.44),Calotropris procera leaf 5 per cent (1:1.21), cow urine (1:1.19) and kinnow leaf 5 per cent (1:0.87).

Keywords

Full Text