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Effect of Insecticides on the Natural Enemies of Rice Insect Pests

Dr. Mainul Haq
Principal Scientific Officer
Entomology Division, BRRI, Gazipur-1701

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

Abstract/ Executive Summary:

Farmers of Bangladesh used chemical insecticides to control the pests of rice.The chemical insecticides are most costly and often create health hazards, environmental pollution and adverse effect on natural enemies. The experiment was conducted to observe the adverse effects of different types of insecticides on natural enemies.The trials were conducted in a RCB design with four replications. The unit plot size was 4m x 5m. The insecticides were applied at recommended rate and an untreated control was also maintained. Natural enemy population was estimated by direct hill count (20 hill/plot) before and after application of insecticide. Two applications at vegetative (early-mid tillering and maximum tillering) and one application at reproductive phase were done.Four group of insecticides namely, cartap, carbosulfan, chloropyriphos and diazinon had adversely affected the natural enemy population in the rice field. The population of spider and LBB reduced to 37-100% and 34-100%, respectively due to application of different formulations of insecticides.

Keywords: Insecticide, Adverse effect, Natual enemy

Location: BRRI, Gazipur, BRRI reginal station, Rajshahi and Barisal

Start Date: 01-07-2003

End Date: 30-06-2004

Program Area: Pest Management

Non-commodity: Rice, Performance

Objectives:

To observe the adverse effects of different types of insecticides on natural enemies

Methodology:

The effect of commonly used insecticides on natural enemies of rice insect pest were evaluated during Aus and T. Aman 2003 and Boro 2004. The insecticide formulations were cartap, chloropyriphos, carbosulfan and diazinon. The trials were conducted in a RCB design with four replications. The unit plot size was 4m x 5m. The insecticides were applied at recommended rate and an untreated control was also maintained. Natural enemy population was estimated by direct hill count (20 hill/plot) before and after application of insecticide. Two applications at vegetative (early-mid tillering and maximum tillering) and one application at reproductive phase were done.

Source of Information: Proceedings of the BRRI Annual Internal Review for 2003-2004

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In all the trials the most commonly found natural enemies of rice insect pest like, spiders and lady bird beetle were affected by the application of different formulations of the insecticides. Spiders were abundant in all the season and at all stages of the rice crop, while the LBB population was comparatively higher at maximum tillering stage during T. Aman season. Direct hill count before and after application of insecticides in each stages of the rice crop indicated that the population of spider and LBB reduced to 37-100% and 34-100%, respectively due to application of different formulations.

Knowledge Management: Report/Proceedings