Reduction in phenological parameters and yield of Brassica Campestris due to aphids in various insecticide regimes

Abstract

The immense monetary importance of Brassica is due to its versatile use such as fresh consumption, edible oil, grass and green manuring. Aphid is the dreadful pest of Brassica that has caused significant losses to it. The present study was conducted to estimate the losses in yield. A field trial was conducted to evaluate phenological parameters having four different cultivars of B. campestris subjected to three different insecticide regimes by implementation of RCBD subsequent to the split plot in 2014-15 at Agricultural Farm of Bahauddin Zakariya University Multan. Population of aphids (Brevicoryne brassicae and Lipaphis erysimi) was observed haphazardly in non-sprayed and single sprayed treatments. Aphids reduced the phenological traits and yield of the Brassica plants significantly (P<0.05). The effect of plant variety and interaction of variety and insecticide was non-significant (P>0.05) there was no difference except in case of yield factor where varietal response expressed significant results irrespective of insecticide treatment which was found significant (P<0.05) among all the factors. It was found that single sprayed insecticide treatment was fruitful to cover up to 40 % yield loss.