Deploy pheromone traps in vineyards to monitor the flights of omnivorous leafroller or orange tortrix (coastal areas).
General Guidelines for Using Pheromone Traps
- Place traps in each vineyard for which you need to make pest management decisions, using at least 2 traps per block.
- Distribute traps uniformly through the vineyard. Use the same trap locations each year. Place additional traps in hot spots.
- Hang traps in the shade inside the vines and at least 15 vines from the end of the rows.
- Check traps twice a week until the biofix is established; thereafter, check traps weekly.
- Remove trapped insects from the trap bottom after you count and record the trap catch on the pheromone trap and degree-day monitoring form (example form—PDF)·
- Replace trap bottoms monthly or when they become covered with debris.
- Follow the manufacturer's recommendations for replacing pheromone lures. Store lures in a refrigerator or freezer.
When To Put Out Traps
| Pest | Where and when to set traps | Biofix |
|---|---|---|
| Omnivorous leafroller | Central Valley and other warm inland valley vineyards—just before budbreak | First night moths are caught consistently in traps |
| Orange tortrix | Coastal regions—late December | When low catches are observed between late January through early February and again in early June |