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Research Detail

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Nur Ahmed
CSO (C.C)
Head, Entomology Division BRRI, Gazipur 1701

Björn Holmquist
Professor
Department of Statistics Lund University, Lund Sweden

Sultana Nasrin
Researcher
Department of Statistics Lund University, Lund Sweden

S.S Haque
PSO
Entomology Division BRRI, Gazipur 1701

A B M A Uddin
SSO
Entomology Division BRRI, Gazipur 1701

M M Kabir
SO
Entomology Division BRRI, Gazipur 1701

J. C. Biswas
CSO
Soil Science Division BRRI, Gazipur 1701

N. U. Sekhar
Director (Asia projects)
BIOFORSK, Norway

Global warming is expected to increase/decrease frequency of rainfall/precipitation, drought intensity and solar radiation which may affect rice ecosystems particularly arthropods e.g., pests and their natural enemies. The present study discuss influences of climatic variations from almost two decades, on yellow stem borer (YSB), brown planthopper (BPH), green leafhopper (GLH) and their natural enemies (spider, lady bird beetle-LBB, green mirid bug-GMB). Light trap and sweep net catches of arthropods from different rice habitats shows a strong bi-annual periodicity for BPH, YSB and GMB. The increasing trend, in the GLH, LBB and SPIDER abundance series between 1996 and 2005 has flattened out and is decreasing from 2006 to 2012. This indicates a periodic, slowly varying population abundance characteristic. Two different sampling methods showed different association with climatic variables particularly GLH population.

  YSB, BPH, GLH, GMB, LBB, Spider, Modeling, Climate
  BRRI farm, Gazipur
  01-01-1995
  31-12-2012
  Pest Management
  Insects
  • The present papers discuss with the influence of climatic variation of rice insect pests and their natural enemies.

Rice insect pests and predators those attracted by light were collected from light trap, a permanent device at the rice farm of Bangladesh Rice Research Institute (BRRI), Gazipur (24°0'0″N, 90°25'48″E), for details see Ahmed et al. (2013). The monthly pooled number of insect pests and predators were analyzed. In the present study, three rice insect pests namely, yellow stem borer (YSB), brown planthopper (BPH), green leafhopper (GLH) and one predator of BPH, green mirid bug (GMB) were analyzed. Also, rice insect pest, GLH and natural enemies- lady bird beetles (LBB) and a general predator group, spider (SPIDER) were collected by 100 complete (double stroke- from left to right and right to left) hand sweep-net from three rice ecosystems (rice field, either rain-fed or irrigated, seedbed and ratoon - regenerated rice plant from left over portion of rice plant after harvest) thorough out the year on weekly basis (depend on availability of these three ecosystems during sampling; note this, those ecosystems should be available otherwise not taken). Furthermore, rainfall (mm), temperature (maximum and minimum in 0C), sunshine hours (h) and radiation ((MJ/m²)) were recorded and data were collected from weather station at the BRRI Farm, Gazipur. Almost two decades data were collected during January 1995 to December 2012.

 

  Climate change and adaptation: Crop production in drought and saline prone area of Bangladesh (Biswas & Muniruzzaman ed.) published by Bioforsk, Norway and BRRI, Bangladesh, pp. 93-113. 2014
  
Funding Source:
1.  Government Budget:  
  

Climatic variation particularly temperature and rainfall are important for insect pests and their natural enemies abundance which has also been shown in the present study.

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