Cornell has reported sustained SWD catches in several counties. Numbers are not high yet, but have been increasing. Be vigilant in your trap and fruit monitoring, weeding, and irrigation/drainage, and employ a spraying routine that works with your picking schedule. Follow this basic guide:
- Maintain an open canopy to increase sunlight and decrease humidity
- Eliminate weeds within rows to increase sunlight penetration and improve spray penetration into and deposition on the canopy
- Repair leaking drip lines and avoid overhead irrigation when possible. Allow the ground and mulch surface to dry before irrigating, and eliminate areas that encourage puddles.
- If you’ve set your own traps, check them regularly—daily, if possible. Females usually arrive first, but males are quick to follow.
- Check your fruit regularly. Pick groupings of 15-25 ripe fruit from different locations in your field, especially along the edges. Lightly squeeze each fruit. In a resealable bag, mix 1 cup salt and 1 gallon water. Add the fruit and mix well. After 30 minutes, check for small white larvae floating at the top. Repeat for each fruit grouping.
- Apply pesticides every 5 to 7 days; repeat if it rains.
- Rotate pesticides to prevent resistance.