Abstract
We investigated the LD50 values and acetylcholinesterase (AChE) sensitivity to carbamate insecticides in the rice leaf beetle, Oulema oryzae Kuwayama. Resistant populations showed high levels of resistance to PHC (> 28,000 ×), BPMC (135 × to 151 ×) and benfuracarb (21 × to 29 ×). The median inhibition concentration (I50) of carbamates to AChE in resistant populations was clearly greater than in susceptible populations. The acetylcholinesterase insensitivity ratio (IR) values ranged from 634 × (benfuracarb) to > 20,000 × (PHC and BPMC). Therefore, insensitivity to AChE is an important mechanism in carbamate resistance in the rice leaf beetle.
Original language | English |
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Pages (from-to) | 30-32 |
Number of pages | 3 |
Journal | Japanese Journal of Applied Entomology and Zoology |
Volume | 42 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1998 |
Keywords
- Acetylcholinesterase
- Carbamate
- Oulema oryzae
- Rice leaf beetle
- Risistance
ASJC Scopus subject areas
- Insect Science