Control of yellow stem borer in boro paddy field
Yellow stem borer (YSB), the most destructive pest of rice in Asia, causes serious yield losses in boro paddy fields. It feeds on the stem of the rice plant, causing death of the tillers and reduced grain yield. Therefore, effective management of YSB is crucial for achieving higher rice productivity.
YSB Management Strategies
Integrated pest management practices must be followed to manage the YSB population in boro paddy fields. These management strategies include:
Cultural Practices
Cultural practices play a crucial role in managing YSB in rice fields. Proper early planting can help reduce the incidence of YSB as it avoids the peak emergence period of the pest. The incorporation of rice straw and stubble after harvesting can help to reduce YSB emergence from overwintering sites.
Varietal Choice
Varietal resistance is an effective method in rice pest management. Varieties like BRRI dhan51, BRRI dhan 52, BRRI dhan55, BRRI dhan56, BINA dhan10, BINA dhan11, MTU1010, etc. have shown resistance to YSB.
Chemical Control
Chemical insecticides can be used to manage YSB populations. The most commonly used insecticides are carbofuran, imidacloprid, thiamethoxam, and fipronil. Spray insecticides should be applied at the appropriate time based on YSB population density.
Biological Control
Biological control of YSB in rice fields has proven to be effective in some regions. The egg parasitoid Trichogramma japonicum, the larval parasitoids Telenomus spp., and the predatory bug Cyrtorhinus lividipennis can all be used to control the YSB population.
Use of Traps
Trapping is an effective technique for managing YSB populations. Blue light traps or pheromone traps can be used to attract and trap adult YSBs.
Conclusion
Successful management of YSB in boro paddy fields requires a combination of cultural, biological, and chemical control strategies. Farmers must adopt integrated pest management practices to minimize the yield loss caused by YSB. The adoption of resistant varieties, proper planting time, incorporation of rice straw, and the use of biological and chemical control methods can all contribute significantly to YSB management.