How to Manage Pests

UC Pest Management Guidelines

Set out pheromone traps in vineyards to monitor the flights of omnivorous leafroller or orange tortrix.

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-days monitoring form (100KB, 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 (View leafroller photos.)

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.	Central coast regions—late December	when low catches are observed between late January through early February and again in early June

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PUBLICATION

UC IPM Pest Management Guidelines: Grape
UC ANR Publication 3448
General Information
W. J. Bentley, UC IPM Program, Kearney Agricultural Research Center, Parlier
L. G. Varela, UC IPM Program, Sonoma Co.
F. G. Zalom, Entomology, UC Davis
R. J. Smith, UC Cooperative Extension, Sonoma Co.
A. H. Purcell, Environmental Science, Policy and Management, UC Berkeley
P. A. Phillips, UC IPM Program, Ventura Co.
D. R. Haviland, UC IPM Program, Kern Co.
K. M. Daane, Kearney Agricultural Research Center, Parlier
M. C. Battany, UC Cooperative Extension, San Luis Obispo Co.

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