Effect of different nitrogen doses on the incidence of hyadaphis coriandri (das)

Effect of five different doses of nitrogen was observed on the incidence of aphid, Hyadaphis coriandri (Das) on coriander. The data revealed that peak population was recorded in the eight standard meteorological weeks. The maximum incidence was observed on 150% of RDN, while minimum was recorded in untreated check. The maximum yield was obtained in the treatment of 100% of RDN, minimum in untreated check. A positive correlation was found between different doses of nitrogen and aphid population and seed yield.