10-1-2 EVALUATION OF THE EFFECTIVENESS OF DIFFERENT INSECTICIDES AT DIFFERENT TIME OF APPLICATION AGAINST RICE YELLOW STEM BORER (SCIRPOPHAGA INCERTULAS)


U. K. Roy, K. S. Islam*, S. N. Islam, M. N. Sarkar, S. Shahanaz, S. Roy and M. Z. Tareq*


*Corresponding author, Email: zablulbarj@gmail.com


Abstract


Rice yellow stem borer (Scirpophaga incertulas) is considered as one of the major pest of rice. An experiment was carried out in the field laboratory, department of Entomology, Bangladesh Agricultural University to find out the effectiveness of different insecticides at different time of application against rice yellow stem borer during the period from January to June, 2014. The treatments included Impride 17.8 SL (Imidacloprid), Mascodan 5 G (Carbofuran), Aroma 50 SC (Fipronil), Morter 48 EC (Chlorpyrifos) at the rates per hectare of 125 ml, 3.24 kg, and 81.78 ml respectively and also Neem (Azadirachta indica) Extract at the rate of 15 ml per liter. The effectiveness were determined by counting dead heart and white head caused by the attack of rice yellow stem borer infestation on rice at vegetative, booting and panicle initiation stages. The reduction of dead heart and white head varied significantly with time interval due to differential dose of insecticides. Minimum number of dead heart symptoms were observed in Mascodan 5 G and minimum with Aroma 50 SC. Percent reduction over control of dead heart was also high with Mascodan 5 G at both vegetative and booting stages; and percent reduction over control of white head was high with Aroma 50 SC in panicle initiation stage. Again Mascodan 5 G showed highest yield compared to other selective insecticides. On the other hand, Neem extract was the least effective one among the applied insecticides showing lower yield although it was higher than control plot having no insecticides application.


Keywords: Rice, stem borers, insecticides, growth stages


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