Abstract
Abstract Cabbage was transplanted on 17 Dec at the University of Arizona Yuma Valley Agricultural Center onto 40-inch beds with a 10-inch spacing between plants. Plot size was 4 beds by 25 ft long, replicated 4 times in a randomized complete block design. Applications were made on 23 Mar using a C02 backpack sprayer equipped with a 2-nozzle boom with Teejet D2-23 nozzles at 40 psi and at a rate of 10 gal/acre. Efficacy was determined by examining 10 leaf samples per plot from the outer rosette of leaves surrounding the head. Samples were rated on a scale of 1 to 5, with 1 being few to no aphids and 5 representing a heavy infestation. Both green peach aphids and cabbage aphids were present with no differentiation made between the two. Evaluations were made on 24, 26, and 27 Mar and 1 Apr.
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