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Six insecticides (lindane, phosmet, diazinon, acephate, propoxur, and carbaryl) were tested to determine effects on predators and parasites associated with southern pine beetle, Dendroctonus frontalis Zimmerman, in eastern Texas. Eleven species of parasites and predators emerged from insecticide-treated pine bolts. The most prevalent species was Coeloides pissodis followed by Medetera bistriata, Roptrocerus xylophagorum, Corticeus glaber , and Thanasimus dubius . In terms of emergence from treated pines, only diazinon significantly reduced the total number of associated insects. They were 65% fewer in number following diazinon treatment. The insecticides differed in their effects on the 11 associates. C. glaber, C. pissodis, M. bistriata, R. xylophagorum , and Dinotiscus dendroctoni were the only species showing significant effects due to chemical treatment. R. xylophagorum emergence was significantly greater from all insecticide treatments than from the untreated pines.

Effects of Six Insecticides on Emergence of Some Parasites and Predators from Southern Pine Beetle 1 Infested Trees 2