Snapdragons, Leafminer Control, 1979

Snapdragons, averaging 10.5 inches in height planted in 4-inch plastic pots and naturally infested with a population of Liriomyza leafminers, were divided into groups of 10 plants. Treatments (test chemicals) were then applied to a group to runoff with a 3-gallon Hudson Climax sprayer maintained at full pressure. One group of 10 plants served as untreated checks. Spray solutions included 2 drops of Palmolive dishwashing liquid per gallon as a surfactant. The spray date, April 11, was sunny with the air temperature 62°F at the time of application. Test plants were examined with a stereo-microscope one week after application to determine the number of leafminers alive, the number of larvae mining and those that had successfully pupated as indicated by exit holes, and the number of larvae dead in the mines.