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.
|Number of pages||3|
|Journal||Japanese Journal of Applied Entomology and Zoology|
|Publication status||Published - 1998|
- Oulema oryzae
- Rice leaf beetle
ASJC Scopus subject areas
- Insect Science