Variation of brown planthopper population from major rice regions of Peninsular Malaysia

H. Habibuddin

Abstract

A field survey was conducted in 1986 to identify and monitor changes o f the brown planthopper (BPH) (Nilaparvata lugens Stal.J) population in major rice growing regions of Peninsular Malaysia. Result indicated a shift in their predominance. Biotype-1 is still dominant in the cast coast but in the west coast the population were of a mixture of biotype 1. biotype 2 and biotype-3 that could attack TNI (no Bph-resistance gene). IR 26 or Seberang( Bph/ gene) and IR 42 or IR 36 (bph2 gene) . he susceptiblity of  Seberang .IR 26 and IR 42 in the MADA region could be due to the presence of these newly developed biotypes as a result of extensive planting of varieties carrying those genes before and during the study period. The presence of mixture biotypes in Tanjong Karang could not be explained since the variety such as IR:12 was not widely planted there. The possibility of population migration from North Sumatera to the Peninsular could not be totally excluded. However, the variety Rathu Heenathi (with Bph3 gene) still remains highly resistant to all the BPH colonies tested.

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