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• W25609969 abstract "Several new insecticide was compared to Admire and Provado combinations for management of aphids in head lettuce in Yuma in two trials conducted in 1998. Foliar applications of Provado, Fulllfill, Aphistar and Acetamiprid appear to provide an alternative method of controlling aphids on lettuce comparable to prophylactic applications of Admire. In addition, at planting and side dress soil applications of thimethoxam provided aphid control comparable to Admire. The prevention of aphid colonization in lettuce heads with the foliar alternatives may depend greatly on the timing and frequency of applications before harvest occurs. Residual activity of the new foliar alternatives ranged from at least 7 -14 days. These studies suggest that more than one application of the foliar products will be necessary to adequately suppress aphid contamination in heads. Evaluations of thiamethoxam suggest that it is more mobile in the soil than Admire and may be a candidate for side dress applications for aphid management. Introduction Green peach aphid, Myzus persicae (Sulzer), is a common pest of iceberg lettuce, Lactuca sativa, in the western United States. This polyphagous aphid species causes economic damage to lettuce through direct injury, virus transmission, and contamination of heads. Because most Western iceberg lettuce is packed in the field at harvest, it must be relatively free of contamination by aphids and other pests. Consequently, lettuce is routinely treated with insecticides throughout the season to prevent aphid colonization. Over the past two years aphid populations in the Yuma area have occurred at manageable levels that growers can tolerate. These declines in pest populations can largely be attributed to the use of Admire 2F (imidacloprid) soil treatments which provide season long protection against green peach aphids. However, an important development in the past year has been the development of several new insecticides. We conducted two studies in the spring of 1998 to evaluate the effects of several foliar alternative chemistries and a new , soil applied chlornicotinyl insecticide compared with Admire. Our objective in these studies was to determine the proper timing and frequency of application of these chemicals for aphid management in head lettuce. Materials and Methods Two studies were conducted at the University of Arizona Yuma Agricultural Center in spring 1998 season. In the first trial, Lettuce 'Winterhaven' was direct seeded 2 Nov into double row beds on 42 inch centers and subbed up beginning on 3 Nov. In the second trial, Lettuce 'Van Max' was direct seeded 16 Nov into double row beds on 42 inch centers and subbed up beginning on 17 Nov. Plots consisted of 4 beds, 75 feet long with a two bed buffer between the plots. Plots were arranged in a randomized complete block design with four replications. Treatments consisted of the following table (1):" @default.
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• W25609969 date "1999-02-01" @default.
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• W25609969 title "New Insecticide Alternatives for Aphid Management in Head Lettuce" @default.
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