Residual Toxicity Studies of Eight Insecticides on Tarnished Plant Bug, 1981

Tarnished plant bugs, Lyguslineolaris, were collected from butterweed, Erigeroncanadensis, near Auburn, AL. An indoor spray table equipped with a conveyor belt, a 500 ml spray tank, and a #8001 Teejet nozzle was used to simulate field spraying. The spray table was calibrated to deliver 5.2 gpa at 20 psi. Discs, 2.5 cm dia, were cut from leaves of greenhouse-grown cotton plants. The discs were placed on a moistened paper towel on a wooden board and sprayed with insecticides. Sprayed discs were placed in 0.75 oz plastic creamer cups containing a 2.5 cm disc of moistened filter paper to keep leaf tissue turgid. Cups were sealed with plastic caps. Five adult tarnished plant bugs were placed on each treated leaf disc at 0, 18, 24, 48 and 74 hr post-treatment, and checked for mortality after 24 hr. Each of 10 treatments were replicated 6 times.