Population dynamics of aphid, Lipaphis erysimi (Kalt.) and predators on cabbage

Abstract

The studies on population dynamics of aphid, Lipaphis erysimi (Kalt.) on cabbage indicated that the infestation of aphid, L. erysimi commenced in the I" week of December with the population of 10.60 per plant. Thereafter, population increased gradually and reached to peak of 281.20 aphids per plant during 2nd week of February. The aphid population was gradually decreased towards the maturity of the crop. Correlation studies indicated that aphid population exhibited non-significant negative correlation with maximum temperature, wind velocity and mean bright sunshine hours. While minimum temperature, morning relative and evening relative humidity showed non-significant positive correlation with pest population. The population of aphids showed significant positive correlation with coccinellid beetles.