Abstract
Abstract Thirty tomato plants 7 to 9 weeks old were placed in an isolated greenhouse containing tomato plants heavily infested with whiteflies. Twenty-four hours later the plants were moved to another isolated greenhouse free of plants and pests and any adult whiteflies on the test plants were killed with a thorough treatment of Cyanogas that evening. Thirteen days later whitefly crawlers were observed as anticipated. Therefore, on day 14, 24 of the test plants were divided into 6 groups of 4 each for treatment (prepared in water and applied to runoff with a Hudson Climax sprayer). The other 6 plants were treated with water from a Hudson sprayer with no history of chemical use. On day 7 and 8 post-treatment, 6 leaf discs 2.45 cm2 were removed from areas on each plant determined to contain high numbers of whitefly nymphs. Each disc was observed for the number of live and dead nymphs with a stereo-microscope. Data were analyzed by the f-test to determine significance, and means were separated by DMRT.
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