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Evaluating Management Options for European Red Mite and Sevin-Resistant Grape Leafhopper, and Postemergence Weed Management Demonstration in Finger Lakes Vineyards 1999

Project Leaders: T. Martinson, T. Weigle

Objectives:

1. Evaluate efficacy of dormant and early-season oil treatments on European red mite populations as an alternative to Rescue miticide sprays.

2. Document relative effect of early-season application of imidacloprid and methomyl on insecticide-resistant Eastern grape leafhopper populations.

3. Demonstrate use of postemergence weed management in Finger Lakes vineyards.

4. Compile weather and pest-monitoring information from baseline vineyards into pest management updates for distribution via code-a-phone messages and electronic (e-mail or fax) updates.

Results:

Dormant oil had no effect on European red mites, but early-season applications of stylet oil showed promise for mite control. Both imidacloprid and methomyl suppressed Sevin-resistant leafhoppers, but imidacloprid provided longer-lasting protection and is more compatible with biological control organisms than methomyl. Postemergence weed control programs resulted in weed control equivalent to that achieved with preemergence herbicides. Timely pest information was collected weekly from eight Finger Lakes vineyards and was incorporated into twice-weekly pest updates. These updates were distributed via electronic mail and telephone messages. The growers appreciated the timeliness of the e-mail messages.