PROBING BEHAVIOUR OF BROWN PLANTHOPPER, NILAPARVATA LUGENS (STAL.) ON RICE PLANT AS INFLUENCED BY NITROGEN APPLICATION

摘要

Rice is an important cereal crop of the world which is known to be attacked by several insect pest during its different development stages out of these brown plant hopper (N.lugens) is an important insect pest of rice. The main approach for the management of this pest has been through the chemical methods which has resulted several problems; therefore the fertilizer components affecting the biophysical parameters of the host ultimately influencing the probing behaviour of BPH (N.lugens) was thrust point of investigation. In present study the major components of fertilizer viz., nitrogen was tested at 0, 40, 60, 100, 160, 220, 280, 340, 400 and 460 kg/ha and its impact on the probing behaviour of N.lugens was recorded. There was significant negativecorrelationship (r = -0.85) between probe marks and nitrogen doses. The regression equations for probe marks in relation to different nitrogen levels applied was = -.0324x + 22.304.