Abstract
The entomogenous nematode, Steinernema feltiae, was field tested for its ability to control the seslid borer, Synanthedon culiciformis, in alder in the fall. When 6.5 or 11.5 million nematodes were applied to the entire trunk, 77-84% borer control was obtained. When each gallery opening was treated with 18,000 or 36,000 nematodes, 86-93% control was obtained. The entomogenous nematodes, S. feltiae and S. bibionis, were tested by trunk spray applications to control another sesiid borer, Synanthedon resplendens, in sycamore in the fall and spring. The fall application was not successful for either nematode species and the spring application provided 61% control of the borer with S. feltiae only. Synanthedon culiciformis occurs in the moist heartwood habitat of alder trees which is advantageous to nematode survival and searching abilities. Synanthedon resplendens occurs in the drier bark galleries and has small gallery openings which prevent nematode penetration into the galleries. Other factors that affect the success of the nematodes against these borers are discussed.
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