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The Impact of Climate Change on the Changes in Abundances of Rice Insect Pests and Their Enemies Over Almost Two Decades in Bangladesh

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

Sheikh Shamiul Haque
PSO
Entomology Division BRRI, Gazipur 1701

ABM Anwar Uddin
SSO
Entomology Division BRRI, Gazipur 1701

Md. Panna Ali
SSO
Entomology Division BRRI, Gazipur 1701

MM Mir Kabir
SO
Entomology Division BRRI, Gazipur 1701

Abstract/ Executive Summary:

Rice ecosystems are important for the world population for livelihood, socio-economy and nutrition. Global warming is predicted to increase/ decrease frequency of precipitation, drought-intensity and solar-radiation which affect rice ecosystems e.g., pests and their natural enemies. We discuss influence 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. Decreasing rainfall over time reduce the last two years to about 2/3rd of the usual average rainfall over the last decades.

Keywords: Modeling, YSB, BPH, GMB, GLH, SPIDER, Weather variables

Location: BRRI farm, Gazipur

Start Date: 00-01-1996

End Date: 00-12-2012

Program Area: Pest Management

Commodity: Insects

Objectives:

To study the influence 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).

Methodology:

Light attracted rice arthropods (e.g., insect pests and predators) were collected from light trap, a permanent set-up/ device at the rice farm of Bangladesh Rice Research Institute (BRRI), Gazipur (24°0'0″N, 90°25'48″E). The monthly pooled number of insect pests and predators were analysed. In the present study, three rice insect pests namely, yellow stem borer (YSB), brown planthopper (BPH), Green leafhopper (GLH) and one predator- green mirid bug (GMB) were analysed. Also, rice insect pest, GLH and natural enemies- lady bird beetles (LBB) and spider (SPIDER) were collected by 100 complete hand sweep-net (double stroke) 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 °C), sunshine hours (h) and radiation ((MJ/m²)) were recorded and data were collected from nearest weather station or weather station at the BRRI Farm, Gazipur. Almost two decades data were collected during January 1996 to December 2012.

Source of Information: Proceedings of 5th International Conference on Environmental Aspects of Bangladesh [ICEAB 2014]. 93-96.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Development of some sorts of model to predict and forecast of rice arthropods.

Knowledge Management: Journal