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Research Detail

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Dr. Md. Nazmul Bari
Senior scientific Officer
Entomology Division, BRRI, Gazipur-1701

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

Dr. Nur Ahmed
CSO& Head
Entomology Division, BRRI, Gazipur-1701

The experiment was conducted at Bangladesh Rice research Institute (BRRI) farm Gazipur by growing nectar-rich flowering plants (Marigold) on bunds of rice crops to conserve natural enemies through different ecological engineering approaches. Highest natural enemies, per cent parasitism by Trichogramma zahiri were observed in rice field nearby nectar-rich flowering plants. However, least natural enemies and parasitism were found in rice field where four times (continuous/ prophylactic) insecticides were applied.  Moreover, there was no yield reduction observed in rice field surrounding by flowering plants compared with insecticide application.

  Eco-engineering, Pest, Natural enemies, Conservation, Flowering plants
  BRRI, gazipur
  01-07-2013
  30-06-2014
  Pest Management
  Predator
  • To conserve natural enemies through different ecological engineering approaches

The experiment was conducted in a large field divided in to three block and each block divided in to four plots. Nectar-rich flowering plants (Marigold) were planted on bunds of each four plots of the first block to provide food and shelter for different parasitoids. Normal cultivation was done in the second block except no insecticide. Prophylactic use of insecticide was applied (carbofuran 5G@10.0 kg/ha) at 15 days interval (4 times) in each of four plots of the 3rd block after 1st top dressing of urea fertilizer. Twenty complete sweeps were taken from all the blocks every 15 days interval up to flowering.  Insect pest and natural enemies number of all sweeps from different blocks were counted and recorded separately from four different treatments i.e., T1= One meter away from the flowering plants of rice bunds, T2=  Four meter away from the flowering plants of rice bund, T3= Prophylactic insecticide use  and T4= Control.Parasitism was determined from all the plots separately through retrieval method.

  Proceedings of the BRRI Annual Internal Review for 2014
  
Funding Source:
1.  Government Budget:  
  

Highest number of grasshopper (GH), green leafhopper (GLH) and white leafhopper (GLH) were found in T1 (6, 2 and 2 per 20 complete sweeps respectively). But the incidence was below the Economic threshold level. Incase of natural enemies, highest number of spider, damsel fly (Dam. fly) and lady bird beetle (LBB) (19, 6.75 and 2.5 per 20 complete sweeps respectively) were found in T1. In T3,  used insecticide was fourth time (carbofuran 5G@ 10.0 kg/ha) but yield was similar to that of T1 & T2 where nectar- rich flowering plants were grown in bunds surrounding rice crops. Lower yield was  observed in T4 where no insectiside applied and no flowering plants grown in rice bunds. Moreover lowest parasitism occurred by Trichogramma zahiri where continusly used insectiside.

Highest natural enemies, per cent parasitism by Trichogramma zahiri were observed in rice field nearby nectar-rich flowering plants. However, least natural enemies and parasitism were found in rice field where four times (continuous/ prophylactic) insecticides were applied.  Moreover, there was no yield reduction observed in rice field surrounding by flowering plants compared with insecticide application. So, farmers can avoid the toxic and hazardous insecticides to control the insect pests by growing nectar-rice flowering plants on the bunds of surrounding rice crops.

  Report/Proceedings
  

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