Effect of row spacing and different levels of nitrogenous fertilizer on population density of thrips (Thrips tabaci Lind.) in onion (Allium cepa L.)

摘要

A field experiment was conducted to find out the effect of row spacing and different levels of nitrogenous fertilizers on the population densities of thrips (T. tabaci) infesting onion. A spacing of 30 cm between rows and 150 kg/ha nitrogen had low level of thrips population and gave highest yield.