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Oviposition Model for Timing Insecticide Sprays Against Plum Curculio (Coleoptera: Curculionidae) in New York State

Reissig, W. H. ; Nyrop, J. P. ; Straub, R.

In: Environmental Entomology, 1998, vol. 27, no. 5, p. 1053-1061

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    Title
    • Oviposition Model for Timing Insecticide Sprays Against Plum Curculio (Coleoptera: Curculionidae) in New York State
    Author
    • Reissig, W. H.. Department of Entomology, New York State Agricultural Experiment Station, Barton Laboratory, Cornell University, Geneva, NY 14456
    • Nyrop, J. P.. Department of Entomology, New York State Agricultural Experiment Station, Barton Laboratory, Cornell University, Geneva, NY 14456
    • Straub, R.. Department of Entomology, New York State Agricultural Experiment Station, Barton Laboratory, Cornell University, Geneva, NY 14456
    Document Type
    • Postprint
    Language
    • English
    Published in
    • Environmental Entomology, 1998, vol. 27, no. 5, p. 1053-1061. Oxford University Press
    Other Version
    OAI-PMH Identifier
    • oai:doc.rero.ch:303912
    Summary
    Plum curculio, Conotrachelus nenuphar (Herbst), feeding and oviposition on apples during spring was measured for 3 yr in a heavily infested orchard in New York State. A logistic model was formulated to relate cumulative fruit injury to cumulative heat units (degree-days base 10°C [DD10]) following petal fall. Cumulative plum curculio injury was well described by the model in the trees from which data for the model were collected. However, injury progressed faster and ended earlier in smaller trees at the same site and at a different site, probably because of differences in tree architecture. Field trials showed that protection of the fruit via insecticide residue was no longer necessary after the model predicted that 40% of the cumulative plum curculio oviposition and feeding cycle had been completed (171 DD10 after petal fall). Based on historical weather records, use of the model to schedule insecticide treatments would save 1 insecticide application nearly half the time compared with a standard of 3 insecticide applications. A delay between initial plum curculio feeding and oviposition, which coincides with the petal fall, phenophase, and steadily increasing damage, which is influenced by temperatures after petal fall was observed. The effectiveness of delaying insecticide treatments until the rate of plum curculio damage was rapidly increasing was compared with treatments applied at petal fall. Delaying the 1st insecticide application resulted in higher levels of damage compared with making the 1st treatment immediately after petal fall