Abstract
Invertebrate predators of Choristoneura pinus Freeman (Lepidoptera: Tortricidae) were studied in the laboratory and observed under field conditions in an investigation of their feeding response and behavior. Observations were made on the biology of important predators in northern anil central Michigan. The distribution, number, and kinds of spiders associated with 6 jack pine trees were investigated in Baraga County. Eight species of insects were recorded preying on various stages of C. pinus. Anatis occllata (L.), Podisus sereventris Uhler, and Camponotus novchoracensis Fitch were the most abundant of this group. Field observations suggested that populations of P. serieventris exhibited a numerical response to increases in buclworm numbers. Fifty-one species of spiders were collected from jack pine trees. Three-quarters of them were hunting spiders that belonged to the families Thomisidae, Salticidae, and Oxyopidae. One species, Metaphidippus flavipedes Peckham, accounted for 48.0% of this group. Theridion murarium Emerton, Dictyna phylax Gertsch ' Ivie, and Grammonota pictilis O. P.-Cambridge were the most common web-spinners encountered. Observations suggested that defoliation and natural stand closure are factors that limit populations of spiders in jack pine stands. No crown level or type of stand could be characterized by specific groups or species.
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