STUDIES ON PEST SUCCESSION IN CABBAGE CROP WITH SPECIAL REFERENCE TO EVALUATE THE EFFICACY OF A NEW CHEMICAL FOR THE CONTROL OF DIAMOND BACK MOTH

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Date
2006
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Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
The investigation entitled “Studies on pest succession in cabbage crop with special reference to evaluate the efficacy of a new chemical for the control of diamond back moth” was conducted at the research farm of college of Agricultulture, I.G.A.U. Raipur, during the winter 2004-05. In the pest succession studies diamond back moth, Plutella xylostella and aphids, Myzus persicae, Bravicoryne brassicae, Lipaphis erysimi were recorded as major pests through out the cropping season. The maximum activity period of diamond back moth and aphids were recorded during January and November months respectively. The other pests recorded were web worm, Crocidolomia binotalis, flea beetle, Phyllotreta cruciferae, tobacco caterpillar, Spodoptera litura and bihar hairy caterpillar, Spilosoma obliqua though at a very low level of infestation. The population build up of insect pests and natural enemies initiated with an increasing trend from the month of October to February. The maximum and minimum atmospheric temperature ranged from 27 to 31.3 and 9.6 to 16.9 oC respectively, and was found ideally suited for the build up of pests and natural enemies populations. The morning and evening relative humidity ranged from 85 to 91 and 24 to 34 per cent respectively was also found ideally suited for the population build up of pests and natural enemies of the crop. The new chemical namely KN 128 15 EC was evaluated in different doses along with endosulfan, malathion and Kamdhenu. The efficacy of KN 128 15 EC @ 40 gm a.i/ha was found to be the best as it recorded maximum reduction in larval population and also gave the maximum yield of healthy cabbage i.e. 7.50 kg/plot. Kamdhenu @ 5000 ml/ha was in next order of effectiveness. KN 128 15 EC at other doses and malathion and endosulfan were not very effective.
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