Plant Protection Bulletin (Taipei) (2005) 47, 115-127

J.C. Hsu, G.L. Li and H.T. Feng (2005)
Susceptibility of cowpea aphid (Aphis craccivora), cotton aphid (Aphis gossypii), turnip aphid (Lipaphis erysimi) , and green peach aphid (Myzus persicae) to several insecticides in Taiwan
Plant Protection Bulletin (Taipei) 47 (2), 115-127
Abstract: Field populations of 4 aphid species, the cowpea aphid (Aphis craccivora Koch), cotton aphid (A. gossypii Glover), turnip aphid (Lipaphis erysimi (Kaltenbach)), and green peach aphid (Myzus persicae (Sulzer)), were collected from Hsinchu, Taichung , Changhua, Yunlin, Chiayi, and Kaohsiung in Taiwan to evaluate the insecticide susceptibilities using a leaf- or seedling-dip bioassay. Susceptibilities to 9 conventionally adopted insecticides, i.e., phenthoate, benfuracarb, carbosulfan, pirimicarb, bifenthrin, cyfluthrin, deltamethrin, flucythrinate, and imidacloprid, were the lowest in the green peach aphid and the highest in the cowpea aphid, which differed significantly from cotton aphids and turnip aphids with respect to their susceptibilities to these insecticides. The insecticide susceptibilities significantly differed with respect to aphid species as well as collecting locations. On the average, the 4 aphids exhibited the lowest susceptibility to phenthoate and the highest to bifenthrin except for the green peach aphid. Moreover, cotton aphids exhibited the same susceptibilities between bifenthrin and deltamethrin, and the turnip aphid exhibited the same susceptibilities among imidacloprid, cyfluthrin, and bifenthrin. Although having the lowest susceptibilities to phenthoate and flucythrinate, the highest susceptibilities to imidacloprid and cyfluthrin were recorded in green peach aphids, since the LC50 values of phenothoate, deltamethrin, and flucythrinate were larger than the concentrations of field recommendations by 15.7-, 162-, and 216-fold, respectively. The field control effect of these 3 insecticides against the green peach aphid must be extensively evaluated. Based on the susceptibilities and resistances to various insecticides in these 4 aphid species, separate control and resistance management strategies must be adopted for individual aphid species.
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Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Aphis gossypii		Taiwan
	Myzus persicae		Taiwan
	Aphis craccivora		Taiwan
	Lipaphis erysimi		Taiwan