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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. Mainul Haq
CSO and Head
Entomology Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

Abstract: A total of 137 insecticides were evaluated against different insect pests of rice showed that 63 insecticides were effective against brown planthopper, 21 against rice hispa and 23 against yellow stemborer. These insecticides were recommended for registration.

Keywords: Insecticide, Evaluation, Major insect pest, Rice

Location: BRRI,Gazipur

Start Date: 01-07-2008

End Date: 30-06-2009

Program Area: Pest Management

Commodity: Rice

Objectives:

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

Methodology:

The experiments were laid out in a CRD with four replications and the individual plot size was 4m X 5m. After one hour of spraying of each insecticide, four randomly selected rice hills of each plot were confined by mylar film cages. Ten 3rd - 4rth instar BPH nymphs or adult rice hispa beetles were released on each of those confined plants. Each hill represented a replication. The granular insecticides were broadcasted one day before infestation. Mortality of insects was counted at 24 and 48 hours after treatment (HAT) and results were adjusted by Abbott's formula. For yellow stemborer trial, four randomly selected rice hills/plot were separately infested with 1st instar larvae emerged from one egg masses. Insecticides were applied two hour after release of the larvae. Each hill represented a replication. Stemborer larvae were released again one day after spraying in all the selected hills. The dead hearts were counted 20 days after insecticide application.

Source of Information: Proceedings of the BRRI Annual Internal Review, 2008-09

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Out of 137 insecticides 63 insecticides (23 in Aus, 12 in T. Aman and 28 in Boro season) were found effective (gave mortality 80% or above) against BPH. Twenty one insecticides (11 in Aus, 3 in Aman and 7 in Boro season) were found effective (gave more than 80% mortality) against rice hispa. Twenty three insecticides (10 in Aus, 2 in Aman and 11 in Boro season) were found effective against yellow stemborer (reduced deadheart 80% or above over control).

Knowledge Management: Report/Proceedings