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Pest and Natural Enemy Incidence at BRRI Farm

A.B.M. Anwar uddin
Scientific Officer
Entomology Division, BRRI, Gazipur-1701

Mahfuj Ara Begum
SSO
Entomology Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

Green leafhopper (GLH), white leafhopper (WLH) and grasshoppers (GH) were the most abundant pests during the reporting period and Aus and T. Aman season had comparatively higher incidence of insect pests than the Boro season. Staphylinid beetle (STPD), spider (SPD) and ladybird beetle (LBB) were the dominant natural enemy population in the reporting year. The domination of SPD population, irrespective of habitats, was observed in Aus and Aman season, but that of LBB was observed in seed beds, grass fallow lands and irrigated rice of Boro season.

Keywords: Pests, Natural enemy, Rice

Location: BRRI, gazipur

Start Date: 01-07-2009

End Date: 30-06-2010

Program Area: Pest Management

Commodity: Rice

Objectives:

To study the pest and their natural enemy incidence patterns in rice and to create a data base.

Methodology:

Populations of rice insect pests, their natural enemies and crop damage intensities in five habitats (seedbed, rice ratoon, grass fallow, irrigated rice, and upland rice) were monitored weekly at BRRI farm, Gazipur. From each habitat one hundred complete sweeps were made and the collected pest and natural enemies were counted. Damage intensity due to some major insect pests and their populations were also estimated from 20 randomly selected hills in each week.

Source of Information: Proceedings of the BRRI Annual Internal Review, 2009-10

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The overall insect pest incidence was found low in the reporting year. Green leafhopper (GLH), white leafhopper (WLH) and grasshoppers (GH) were the most abundant pests and were found in all the three seasons. Aus and T. Aman season had comparatively higher incidence of insect pests than the Boro season. The rice fields and seed beds of Aus and Aman seasons harboured higher population of GH and the highest population of the pest was observed in Aus seed bed. The ratoon, grass fallow and the irrigated rice fields of T. Aman season harboured almost a similar population of GLH. However, Seed beds of Aman season had considerably low population of GLH in T. Aman season. The GLH population observed on grass fallow land in T. Aman season and the GH population found on seed beds of Aus season dominated the pest population in the mentioned seasons. Despite a lower population of insect pests in Boro season a comparatively higher population of GLH was observed on seed beds in comparison to those of the other habitats. Among the natural enemies, the population of spider (SPD), lady bird beetle (LBB) and staphylinid beetle (STPD) outnumbered the other natural enemy populations in different habitats in different seasons. Domination of SPD population, irrespective of habitats, was observed in Aus and Aman season, but that of LBB was observed in seed bed, grass fallow land and irrigated rice of Boro season. Only the seed beds of Aus and Boro season had higher population of STPD and that was highest in Boro season. As the incidence of insect pests, in general, was poor neither the pest number nor the damage incidences caused by them crossed the ETL in the reporting year. However, a relatively higher number of dead hearts (DH) in Aman and a little greater leaf damage in Aus season, incurred by stem borer (SB) and GH respectively was observed in rice fields.

Knowledge Management: Report/Proceedings