Resistance Level of Myzus persicae to Methomyl andλ-Cyhalothrin in Guizhou Tobacco Fields
MENG Jianyu
CHEN Xingjiang
CAO Yi
SHANG Shenghua?
Abstract：In order to provide a basis for the reasonable application of insecticides and controlling M. per-sicae in Guizhou province,the resistance level of 34 M. persicae field populations to methomyl andλ-cyha-lothrin collected from nine districts was determined with dipping method. The results showed that com-pared with the susceptible strain, the average resistance ratio of aphids collected from nine districts to methomyl ranged from 2. 53 to 5. 13,and that toλ-cyhalothrin ranged from 3. 15 to 4. 44. For methomyl, the average resistance of aphids collected from Liupanshui developed to low level,and the average sensi-tivity of aphids collected from Bijie, Qiannan, Anshun, Tongren, Qiandongnan and Zunyi was at the de-creasing level. For λ-cyhalothrin,the average sensitivity of aphids in all nine districts was at the decrea-sing level. In all the 34 populations tested,the resistance to methomyl of aphids collected from Shuicheng, Bijie,Jinsha, Changshun, Guiding, Ziyun and Dejiang developed to low level and the resistance ratio ranged from 5. 20 to 8. 56. The resistance toλ-cyhalothrin of aphids collected from Ziyun,Panxian,Xingyi and Zhenyuan developed to low level and the resistance ratio ranged from 5 . 39 to 5 . 82 . The other strains were still sensitive or at the sensitivity-decreasing level to the tested insecticides.
Keywords：Myzus persicaemethomylλ-cyhalothrinresistanceGuizhou
Publication Date：2015-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 82-85,89 )