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Test of Candidate Insecticides Against Major Insect Pests

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

Sheikh Shamiul Haque
SSO
Entomology Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

Due to environmental changes and intensive cultivation, outbreaks of insect pests is most common. To control this outbreaks new insecticides are essential. Every year different commercial formulations of insecticides are imported from different companies for registration. The experiments were conducted to evaluate the commercial formulations of insecticides against different insect pest of rice. The experiment were laid out in a CRD with four replications and the individual plot size was 20 m² (4m X 5m). One hour after spraying ten 3rd-4th instar BPH nymphs or adult rice hispa beetle were confined by mylar film cage on each of four randomly selected rice hills. 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 YSB egg masses. Each hill represented a replication. One day after hatching insecticides were applied. The dead hearts were counted 20 days after insecticides application.A total of 53 commercial formulations of 16 generic products were tested against brown planthopper (BPH), rice hispa (RH) and yellow stemborer (YSB). Among them 29 formulations (11 generic products) against BPH, 29 against RH and 6 (4 generic products) against SB were found effective (giving more than 80% mortality). A total of 58t out of 62, 8 out of 11 and 25 from 26 commercial formulations of candidate insecticides were effective against BPH, YSB and Hispa respectively.

Keywords: Insecticide, Evaluation, BPH, YSB and RH

Location: BRRI, Gazipur

Start Date: 01-07-2005

End Date: 30-06-2006

Program Area: Pest Management

Commodity: Insecticide

Objectives:

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

Methodology:

Brown planthopper (BPH) and rice hispa (RH): The field trial was conducted in a completely randomized design (CRD) with 4 replications. A large rice field divided into unit plots. Each plots measuring 4mX5m (20 m²) and the variety was BR3. In each unit plot a test insecticide was applied with standard doses and four hills were selected randomly from each plots. Each hill represented a replication. One hour after spraying of test insecticides, ten 3rd-4th instar BPH nymphs/RH adults of greenhouse populations were confined by mylar film cages on each of four randomly selected rice hills. Another plot of same size was used as control without insecticide. in each replication. Four hills were also selected randomly from the control plots and same number of test insects were confined with the same procedure. The granular insecticides were broadcasted 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. Yellow Stemborer (YSB): The trial was designed in CRD with four replications at BRRI farm. Each plot was 20 m² in size. Twenty to thirty larvae were placed in randomly selected four hills from each plot. Each hill represented a replication. Insecticide was sprayed after the release of larvae on the hills. Dead heart number was counted at 15-20 days after the application of the insecticide. Percent dead heart reduction over control was estimated by using the formula of Gomez (1994).

Source of Information: Proceedings of BRRI Annual Internal Review for 2005-2006

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Sixty-two, 34 foliar and 18 granular, insecticides were evaluated against BPH. Among the insecticides 10 were tested in T. Aus, 33 in T. Aman and 19 in Boro seasons. Fifty eight insecticides were found effective (gave more than 80% mortality) against BPH. Eight insecticides out of 11 were found effective against yellow stem borer reducing dead heart 80% and above.Out of twenty six insecticide tested, twenty five were found effective against rice hispa.

Knowledge Management: Report/Proceedings