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Performance of early and late instars of the fruittree leafroller, Archips argyrospila (Walker), was quantified from bioassays using previously uninfested foliage of baldcypress (Taxodium distichum L.) and two other potential hosts. Initial survival and host preference tests indicated that open morphology baldcypress foliage was more suitable for first instars than either appressed morphology baldcypress or pondcypress. Growth, development, and host utilization indices, based on rearing of late instars, revealed that open morphology baldcypress foliage was most susceptible to defoliation. Late-instar bioassays also indicated that pondcypress foliage was the least susceptible cypress foliage type tested, due to mechanism(s) triggering early termination of larval development. The appressed morphology baldcypress foliage was of moderate susceptibility, apparently because of foliage characteristics deterring its consumption. Shumard oak, Quercus shumardii Buckl., and sweet citrus, Citrus siniensis (L.), did not support early-instar survival or late-instar development and, thus, appear to preclude the threat of fruittree leafroller defoliation in the Gulf States. The results indicated that there is a high potential for fruittree leafrollers to infest areas where pondcypress occurs.

Fruittree Leafroller, Archips argyrospila (Walker) (Lepidoptera: Tortricidae), Performance as Influenced by Host Foliage Type