EFFECTIVENESS OF GRANULAR INSECTICIDES ON INSECT PESTS MANAGEMENT IN THREE AMAN RICE VARIETIES

Abstract

A field experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during August to December, 2016 in T. aman season to find out the performance of three transplanted aman rice varieties viz. BRRI dhan33 (V1), BRRI dhan49 (V2) and BRRI dhan51 (V3) against major insect pests with three granular insecticides viz. Furadan 5G (T1), Diazinon 10G (T2), Fifronil 3G (T3) using two factorial randomized complete block design (RCBD) with three replications. Insect pest population for 5 selected hills/plot were observed and in the experimental plot yellow stem borer, leaf folder, rice hispa, grasshopper, brown plant hopper, green leaf hopper, rice bug and rice stink bug were observed. The highest number of the insect pests was recorded from V3T4 treatment combination whereas the lowest number of insect pests was observed from V1T1. In case of tillers, leaf and panicle infestation in different crop stages caused by different rice insect pests, the lowest infestation was recorded from V1T1 treatment combination whereas the highest infestation was observed from V3T4. In consideration of yield contributing characters the maximum number of filled grains/panicle (88.67) was recorded from V1T1 treatment combination while the minimum number of filled grains/panicle (79.33) was counted from V3T4. The highest grain yield (22.33g) was recorded from V1T1 treatment combination while the lowest grain yield (17.33g) was recorded from V3T4. In respect of three granular insecticide Furadan 5G (T1) showed the best achievement against insect pests of rice than T2 and T3. In case of varieties, V1 revealed the best performance than V2 and V3.