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Incidence Pattern of Rice Caseworm (nymphula Sp.)

MAINUL HAQ
Entomology Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

N. M. MOZADDEDUL HAQUE
Entomology Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

A. N. M. REZAUL KARIM
Entomology Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

Abstract/ Executive Summary:

Incidence pattern of rice caseworm were studied from T. Aman (July - December) 1995 to Boro (December - May) 1998 at BRRI farm, Gazipur. Rice caseworm mostly damaged the rice plants 2 to 4 weeks after transplanting. The incidence occurred at 15 th August and subsequent transplanting dates during T. Aman season and the highest leaf damage was observed in case of mid October planting. In Boro season, the incidence occurred in the late February. There were two peak incidence of caseworm in the month of August and October.

Keywords: Caseworm, Nymphula sp., Incidence, Leaf damage

Location: Bangladesh Rice Research Institute (BRRI) farm, Gazipur.

Start Date: 00-00-1995

End Date: 00-00-1998

Program Area: Pest Management

Commodity: Rice

Objectives:

To observe the incidence pattern and also the damage intensities of the rice caseworm.

Methodology:

The study on the incidence pattern of rice caseworm throughout the year has been conducted from T. Aman (July - December) 1995 to Boro (December - May) 1998 at Bangladesh Rice Research Institute (BRRI) farm, Gazipur. Thirty days old rice seedlings were transplanted in 4m x 4m plot with 20cm x 20cm plant spacing at an interval of 15 days. Each transplantation was replicated three times. The rice variety BR3 was planted during the tenure of the trial except in 1995 where variety BR11 was transplanted. The following transplanting dates were maintained in different years and seasons. The incidence and damage intensities of caseworm were assessed by random sampling of 20 hills from each plot of different transplanting dates at 10 -15 days interval. In addition, number of adult casewom moth trapped in light were collected and counted every day from the light trap operated at BRRI farm, Gazipur. Standard cultural operations and continuous standing water was kept in the field to facilitate the activity of caseworm.

Source of Information: J Agric Rural Dev 4(1&2), 75-81, June 2006 ISSN 1810-1860

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The caseworm caused damage to rice plant within 4 weeks after transplanting. The incidence pattern of caseworm generally occurred from the months of August to November. So effective management practices of caseworm should be taken at that crop stage and time of the year.

Knowledge Management: Journal