Seasonal Development of the Tarnished Plant Bug 1 on Apple in Vermont 23

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Abstract
Population studies of the tarnished plant bug (TPB) and selected arthropod predators were conducted in an untreated and in a pesticide-treated orchard in the northern Champlain Valley, VT. At least 2 generations of TPBs were present in 1973 and 1974. There was no significant difference between numbers of TPBs collected in experimental areas in either year. As a result of pesticide use, in 1974 the numbers of arachnids and coccinellids were significantly fewer in the insecticide-treated area. This combination of pesticide use and the cultural control methods used in this area could have influenced the numbers of TPBs remaining on the orchard floor, while predators helped to keep populations in the other 3 experimental areas at similar levels. Plant bug injury to fruit was most severe in the abandoned, untreated orchard area, but fruit damage was more often attributable to other pests.