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Evaluation of Commercial Insecticides Against Major Insect Pest of Rice

Md. Nazmul Bari
Senior Scientific Officer
Entomology Division, BRRI, Gazipur-1701

Dr. Mohammad Fazle Rabbi
CSO and Head
Entomology Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

A total of 165 insecticides (114 against BPH, 29 against RH and 22 against YSB) were found effective out of 190 candidate insecticides tested during 2011-12.

Keywords: Rice, Insecticide, Evaluation, BPH, YSB and RH

Location: BRRI, Gazipur

Start Date: 01-07-2011

End Date: 30-06-.2012

Program Area: Pest Management

Commodity: Rice

Objectives:

To evaluate the efficacy of different commercial formulations of insecticide against major insect pests of rice.

Methodology:

Brown planthopper (BPH): The experiments were conducted in a large field of BR3 divided into unit plot of 20 m². In each of the plots a test insecticide was applied and one hour after spraying of test insecticides, ten 3rd-4th instar BPH nymphs were confined by mylar film cages on four randomly selected rice hills. Each hills represented a replication. Another plot of the same size was used as control without insecticide. Four hills were also selected randomly from the control plots and same number of test insect were confined with the same procedure. The granular insecticides were broadcast one day before infestation. Mortality of insects was counted both from treated and untreated plots at 24 and 48 hours after treatment (HAT) and the results were adjusted by Abbott's formula. Rice hispa (RH): Same procedure like BPH was followed for evaluating insecticides against RH. Adult beetles were used in the trials. Yellow stemborer (YSB): For YSB trial, the field lay-out and unit plot size was similar to as described above. Four randomly selected rice hills per plot were separately infested with the 1st instr larvae emerging from one egg mass. Test insecticides were applied after one to two hours of infestation. The same plants were infested again with new larvae at 48 hours of spraying. The dead hearts were counted 20 days after insecticide application.

Source of Information: Internal review workshop, 2011-12

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Out of 190 insecticides, 114 (32 in Aus, 33 in Aman and 49 in Boro season) against BPH, 29 (11 in Aus, 9 in Aman and 9 in Boro season) against RH (showing more than 80% mortality) and 22 (13 in Aman and 9 in Boro season) against YSB (reduced deadheart 80% or above) were found effective in the trials conducted during the year 2011-12.

Knowledge Management: Report/Proceedings