How to Manage Pests
UC Pest Management Guidelines
Dormant Shoot Sampling
(Reviewed 6/10, updated 6/10)
In this Guideline:
Dormant shoot sampling is used to determine the need for a dormant treatment for the control of San Jose scale, European fruit lecanium, and mite eggs (brown mite and European red mite).
HOW TO SAMPLE (View photos for identification)
Choice of Pesticides
Choice of pesticide depends on which pests are present at damaging levels and when treatment is being applied. During the dormant season, oils alone are effective against the white cap and black cap stages of San Jose scale, which are present at this time, and will also control populations of mite eggs and provide moderate control of fruittree leafroller eggs. Only the highest levels of San Jose scale will require addition of an insect growth regulator. Other pests such as peach twig borer and obliquebanded leafrollers will not be controlled by oil during the dormant season. Environmentally sound insecticides such as Bacillus thuringiensis, chlorantraniliprole (Altacor), diflubenzuron (Dimilin), and methoxyfenozide (Intrepid), however, applied at bloom will control peach twig borer and leafrolling caterpillars. Combining these bloomtime treatments along with a dormant oil application for scales, mite eggs, and leafroller eggs is a good IPM strategy for many orchards. Organophosphates applied during the dormant season for peach twig borer are particularly vulnerable to run-off into waterways, are no more effective than reduced risk products, and should be avoided. Never spray before an expected rainfall. If you wish to treat peach twig borer during the dormant season, consider an environmentally sound insecticide such as spinosad, spinetoram, or diflubenzuron. See the PEACH TWIG BORER guideline.
UC IPM Pest Management Guidelines:
W. J. Bentley (Crop
Team Leader), UC IPM Program, Kearney Agricultural Center, Parlier
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