Abstract
Abstract Seven insecticides were tested for efficacy against green-house whiteflies and for phytotoxic responses of red poinsettias. Plants were grown in 6-inch pots in 50% Metro Mix 350 and 50% sterilized field soil. The plants were pinched to 7 leaves on 2 Oct. Bracts started showing color during the second week of November. Each insecticide was applied with a 2-qt capacity hand pump sprayer to the upper and lower leaf surfaces of 3 plants, which were then placed randomly on benches. Applications were made on 15 Oct and again on 14 Nov. Whitefly populations were measured by inspecting 1 intermediate leaf per plant and counting the adults and immatures present.
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