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Effect of Time of Planting on the Incidence of Gall Midge

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

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

Abstract/ Executive Summary:

Gall midge is going to be a major pest of rice in Bangladesh. But sufficient registered pesticide and technology are not available to control this pest. So the experiment was conducted during T. Aman season to find out the damage intensity and peak incidence period of rice gall midge to escape its damage. Despite a low infestation of Gall midge at Gazipur, comparatively higher infestation was observed in 15th August planting. However, infestation was higher with 30th June planting at 20-25 and 50-55 DAT at Rangpur.

Keywords: Incidence, Gall midge, Pattern, Time of planting

Location: BRRI, Gazipur, BRRI reginal Station, Rangpur and Rajshahi

Start Date: 01-07-2005

End Date: 30-06-2006

Program Area: Pest Management

Commodity: Rice

Objectives:

To find out the damage intensity and peak incidence period of rice gall midge

Methodology:

The experiments were conducted at BRRI farm Gazipur, BRRI regional station Rajshahi and Rangpur during T. Aman 2005. Twenty-one days old rice seedlings of BR3 variety was transplanted following RCBD with four replications at 15 days intervals from 15th May to 15th September. There were nine transplanting dates.The individual plot size was 20m², BRRI recommended fertilizer doses were used in all the plots. Agronomic and other cultural activities were remained same for all the treatments. All the plots remained exposed for the natural infestation of Gall midge. The gall midge incidence was counted from 20 randomly selected hills from each plot at 20-25, 40 and 50-55 days after transplanting (DAT) from each transplanting date.

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:

There was no infestation of gall midge at BRRI R/S, Rajshahi. The gall midge infestation was below the ETL (5%) at all the planting dates at Gazipur. Rice transplanted from 30th July to 30th August suffered relatively higher gall midge infestation than the other plantings. The highest gall midge infestation was found in 15th August planting. Due to heavy rainfall and water logged conditions rice plants of two planting dates (15th May and 30th May) in BRRI R/S, Rangpur were destroyed. The infestations of gall midge were highest in 30th June plantings at 20-25 and 50-55 DAT. The 15th June and 30th August plantings also suffered higher gall midge infestation at 40 DAT.

Knowledge Management: Report/Proceedings