effect of seed treatment on reduction of damage caused by sugar beet harmful moths (spodoptera exigua hbn, agrotis spp. )

to study the effect of seed treatment on damage of harmful moths of sugar beet, an experiment was conducted in rcbd with nine treatments in four replications in karaj for three years (1996-1998). the treatments were applied as follows: t1, check, t2, t3 and t4, sugar beet seeds treated with imidacloprid, fibronil and orten, respectively; t5, pelleted seeds without insecticide; t6, t7 and t8, pelleted seeds with imidacloprid, fibronil and orten, respectively; t9, sprayed traditionally. each plot consisted of six rows in ten meter long. in t9 eterimphos 50% with 0.002 dosage was used. data were taken on harmful moths of sugar beet, including, cut worm (agrotis spp.) and armyworm (spodoptera exigua). percentage of infested plants with each pest (% damaged plants) was determined separately. statistical analysis of three years data showed no significant difference between treatments for percentage of damaged plants by cut worm, but significant difference for those of armyworm.