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Validation of Integrated Pest Management Practices for Rice Insect in North-west Region of Bangladesh

M N Bari
Entomology Division, Bangladesh Rice Research Institute, Gazipur 1701

N Ahmed
Entomology Division, Bangladesh Rice Research Institute, Gazipur 1701

S S Haque
Entomology Division, Bangladesh Rice Research Institute, Gazipur 1701

M F Rabbi
Entomology Division, Bangladesh Rice Research Institute, Gazipur 1701

K M Iftekharuddaula
Plant Breeding Division, Bangladesh Rice Research Institute, Gazipur 1701

Abstract/ Executive Summary:

Integrated Pest Management (IPM), developed by the Bangladesh Rice Research Institute (BRRI) for management of rice insect pests, was demonstrated and validated through intensive investigation in farmer’s fields of Pirganj and Taraganj in Rangpur district during 2012–2014 in two T. Aman and Boro seasons. A portion of each farmer’s field kept under the respective farmers’ supervision without any intervention, which was treated as control treatment (T4). The other portion was managed with three treatment combinations ie, T1=Prophylactic use of insecticide, T2=Perching + sweeping + need based insecticide application and T3=Perching only. BRRI dhan52 and BRRI dhan58 were used in Aman and Boro seasons respectively. RCB design was followed with eight replications for data analysis. The insect infestation was monitored fortnightly by visual counting from 20 hills and also 20 complete sweeps. The insect infestation, yield and yield contributing characteristics were analysed by one way analysis of variance by Tukeys’ post hoc test. The objective of this studies were to validate and demonstrate the IPM techniques in farmers' field. Yellow stem borer, rice leaf roller, long horned cricket, grasshopper, green leafhopper, brown planthopper, white-backed planthopper and gall midge were found as pests in both the locations. However, insect infestation was below the economic threshold level (ETL). No significant differences were observed for insect infestation among the treatments. Natural enemies eg, spider, ladybird beetle, dragon fly, damsel fly, carabid beetle and staphylinid beetle were noticed in both the locations. In some seasons and also locations some natural enemies were not found particularly where indiscriminate/continuous insecticide was used. Thus, it was indicated that indiscriminate/continuous use of insecticide has the detrimental effect on the population of natural enemies. Also, refrained from insecticide application at early crop stages (30-40-day after transplanting) natural enemy populations increased, which might reduce insect population below the ETL. Significantly lower yield was observed at farmers managed fields in both the locations. Therefore, it was found that indiscriminate/continuous use of insecticide had no effect on yield and yield contributing characters of rice, when insect infestation below the ETL. So, farmers could avoid continuous/indiscriminate use of insecticide, which might ultimately save production cost and the environment from insecticidal pollution as well.

Keywords: Validation, Perching, Sweeping, Insect pest and natural enemies

Location: Farmer’s fields, Pirganj and Taraganj in Rangpur district

Start Date: 00-00-2012

End Date: 00-00-2014

Program Area: Risk Management in Agriculture

Commodity: Rice

Objectives:

1. To validate different IPM practices/techniques against rice insect pests in Bangladesh particularly in northern parts from where most of the rice produced.

Methodology:

Eight experiments were conducted in farmers’ fields of Pirganj and Taraganj of Rangpur district by the Entomology Division of BRRI under Integrated Agricultural Productivity Project (IAPP) during T. Aman 2012, T. Aman 2013, Boro 2012-13 and Boro 2013-14. Locations and fields for the component treatments were selected based on land type, variety cultivated and transplanting time. The field size for each farmer was 0.18-0.20 ha. One portion of each farmer’s field was remained under the respective farmers’ supervision without any intervention, which treated as control treatment (T4). The other portion was managed with three treatment combinations ie, T1=Prophylactic use of insecticide, T2=Perching + sweeping + need based insecticide application, T3=Perching only. Eight field experiments were conducted (four farmers’ fields at each upazila) at Taraganj and Pirganj of Rangpur district in each season. The crop was grown in all the farmers’ fields using same seedling age and other agronomic practices. Each experiment was conducted in completely randomized design and one farmer’s field was treated as a replication. The insect infestation (eg number of arthropods ie insect pests and natural enemies and damage) was monitored fortnightly by visual counting of 20 hills and also number of arthropods from 20 complete sweeps. BRRI dhan52 and BRRI dhan58 were grown during T. Aman and Boro season respectively. The insect infestation, natural enemies, yield and yield contributing characteristics were compared by one way analysis of variance using Tukeys’ post hoc test.

Source of Information: Bangladesh Rice J. 19(1): 17 – 31, 2015

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Prophylactic use of insecticide had no effect on yield and other yield contributing characters of rice, when insect pest infestation below the ETL. So, farmers could avoid indiscriminate use of insecticide, which would finally save production cost and the environment from insecticidal pollution. Also, farmers need to visit their fields on regular basis and need to use different IPM techniques eg perching, sweeping etc.

Knowledge Management: Journal