Journal of Entomological Science (2001) 36, 244-250

Tong-Xian Liu, Alton N. Sparks Jr. and Bisong Yue (2001)
Toxicity and efficacy of triazamate against turnip aphid (Homoptera: Aphididae) on cabbage
Journal of Entomological Science 36 (3), 244-250
Abstract: Toxicity of triazamate (Aphistar®, Rohm and Haas, Philadelphia, PA) to a laboratory and a field population of the turnip aphid, Lipaphis erysimi (Kaltenbach), was studied on cabbage in the laboratory, and the efficacy of triazarnate against the aphid was tested in the field in comparison to lambda-cyhalothrin (Warrior®, Zeneca, Wilmington, DE) and imidacloprid (Provado®, Bayer, Kansas City, MO) in 1999 and 2000. Results from the laboratory bioassays indicated that field populations of L. erysimi apterous adults and nymphs were significantly less susceptible to triazamate than the laboratory population. The LC₅₀ values for adults, early and late instars of the field population were 6.7-, 2.7-, and 1.4-fold greater than the corresponding stages of the laboratory population, respectively. Similarly, the LC₉₀ values for adults, early and late instars of the field population were 6.4-, 2.6-, and 1.7-fold greater than the corresponding stages of the laboratory population, respectively. Results from field trials in 1999 and 2000 showed that triazamate and lambda-cyhalothrin reduced the aphid population faster than irnidacloprid after the first application. Triazamate was as effective as lambda-cyhalothrin with low aphid population levels on the plants throughout the season except the last 2 wks in the 1999 trial. In the 2000 trial, an extremely high aphid population was found on untreated plants, whereas two applications of triazamate, as well as lambda-cyhalothrin and imidacloprid, kept aphid population levels suppressed for the entire season.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Tong Xian Liu

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.
	Lipaphis erysimi	Cabbage (Brassica oleracea)	U.S.A. (mid S)