The present investigation entitled “Insect pest succession and management strategies for mustard aphid, Lipaphid erysimi (Kalt.) in Chhattisgarh plains” was conducted at the Research farm College of Agriculture and Research Station, Raigarh, Chhattisgarh, during Rabi 2013-14 and 2014-15. whereas, laboratory work was done in ICAR- Directorate of Rapeseed- Mustard Research, Bharatpur (Rajasthan), Department of Plant Physiology, Agricultural Biochemistry, Medicinal and Aromatic Plants, College of Agriculture, IGKV, Raipur (Chhattisgarh) during both the years. During the period of studies the pest was active throughout the crop season. The appearance of the pest was in first week of January to third week of March with peak period for aphid incidence was 5th to 9th SMW during both the years 2013-14 and 2014-15. So in general the month of February including first week of March seems to be the congenial for the pest activity. Wherever, the peak period for painted bug infestation was 9th to 11th SMW during the years 2013-14 and 2014-15. The pest activity of painted bug was seen in 4th week of February to 2nd week of March to be the congenial for the pest activity. There was no significant relationship between the pest activity and various meteorological parameters viz; maximum and minimum temperature, morning and evening relative humidity and rain fall and pest of mustard crop (aphid and painted bug). The studies on the four sowing dates of mustard i.e. 30th October, 15th November, 30th November and 15th December and four varieties i.e. Pusa Bold, Pusa vijay, Chhattisgarh Sarson-1 and Pusa mustard-25 was conducted and it was observed that crop sown in 30th October with variety Pusa Bold and Chhattisgarh Sarson-1 was less infested by aphid during the both years. Whereas, yield was higher in the variety Pusa Bold and Chhattisgarh Sarson-1 as compared to other varieties. Studies on the morphological and biochemical basis of resistance to mustard aphid infestation that the germplasm with chlorophyll content, leaf area, leaf length, leaf width and leaf thickness. The lower level of chlorophyll content, less leaf area, length, width and thickness to suffered with the less aphid infestation. The correlation study showed that there was a significant positive correlation. The biochemical estimation of the present finding revealed that the higher level of glocosinolate, oleic, erucic, linoliec, ecosanoic, oil and phenol whereas; lower level of protein and linolenic are responsible for imparting moderately susceptible to mustard aphid. The correlation study showed that glucosinolate (-0.76), oleic acid (-0.49) and phenol (-0.63) was significantly negative correlated and protein was (0.43) there was significant positive correlation. Different insecticides and plant products when sprayed in two stages of the crop i.e. at flowering and podding stage with insecticide for minimizing the aphid incidence for determining the effect of insecticides, aphid populations per plant, yield and various growth parameters viz, plant height, biomass, number of siliqua per plant, number of seed per siliqua, length of siliqua, number of branches per plant and there with cost benefit ratio were evaluated. The overall insecticides treated at flowering and podding stage most effectively for aphid population, plant height, grain yield, number of siliqua, length of siliqua, biomass, number of seed per siliqua were found most effective treatment of imidacloprid followed by thiamethoxam, acetamiprid. Whereas, bio-product insecticide was most effective treatment NSKE, neem oil and agro-neem as compared to untreated plot. Insecticide imidacloprid was recorded highest yield, net profit and influenced yield attributing parameters followed by thiamethoxam and acetamiprid. The cost benefit ratio of insecticides was maximum in acetamiprid followed by imidacloprid and the lowest cost benefit ratio was in pongamia oil.
INSECT PEST SUCCESSION AND MANAGEMENT STRATEGIES FOR MUSTARD APHID, LIPAPHIS ERYSIMI (KALT.) IN CHHATTISGARH PLAINS