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Borer problems and their control in dwarf apple trees David Kain, Entomology, NYSAES, Geneva, NY
 

Summary: Borer problems and their control in dwarf apple trees
David Kain, Entomology, NYSAES, Geneva, NY
315-787-2333, dpk1@nysaes.cornell.edu
Dick Straub, Entomology, Hudson Valley Lab, Highland, NY
914-691-6516, rws9@cornell.edu
In the winter of 1998 it came to our attention (via Deb Breth, LOFT) that American plum
borer larvae, which we had recently identified as the prevalent borer pest of tart cherries in western
New York, were invading burrknots on dwarf apple trees. About the same time, Dick Straub,
entomologist in the Hudson Valley, was receiving reports from around the Northeast that dogwood
borer damage seemed to be becoming more common in dwarf apple plantings, as well.
Based on Deb's alert, we decided to conduct a survey in western New York to determine
how widespread American plum borer was in dwarf apples and how abundant it is compared to
dogwood borer. A similar survey had been conducted in the 1970's by Rick Wieres, et al showing
that dogwood borer was common in burrknots. Knowing that American plum borer has built up to
rather high levels in tart cherries over the last 20 years (it's also present in peaches), and that it will
invade apple burrknots, we suspected it may be more common in dwarf apple orchards than
anyone had realized up until now.
Survey Preliminary Results Most of the survey work will take place this fall, because
larvae of both insects can be found easily then. But, some orchards were surveyed this spring and
preliminary results indicate a few things: 1) Most dwarf apple orchards have burrknots and most

  

Source: Agnello, Arthur M. - Department of Entomology, Cornell University

 

Collections: Biology and Medicine