Grape
Grape Weed Photo Gallery, with Common and Scientific Names of Weeds Commonly Found in California Vineyards (12/02) ... [... more]
University of California IPM |
Orange Tortrix
In the Salinas Valley the dominant parasite of orange tortrix is Exochus nigripalpus subobscurus. The adult Exochus wasp is about 0.25 inch (6 mm) long, with a black head and body and yellow legs. This internal ... [... more]
University of California IPM |
Omnivorous Leafroller
The adult omnivorous leafroller is bell shaped with blackish grey snouthlike mouthparts that protrude forward from the head. Forewings are dark rusty brown with the tip being tan in color. Size varies from 0.38 to 0 ... [... more]
University of California IPM |
Grape Weed Photo Gallery, With Common And Scientific ...
C. L. Elmore, Vegetable Crops/Weed Science, UC Davis D. R. Donaldson, UC Cooperative Extension, Napa Co. redmaids (desert rockpurslane)Calandrinia ciliata willowherb, northern or fringedEpilobium cilatum willowherb, panicle-leafEpilobium ... [... more]
University of California IPM |
Sharpshooters
A treatment is warranted if after several successive warm days above 70°F there is a sharp increase in the number of blue-green sharpshooters trapped, or if more than an average of seven sharpshooters are found ... [... more]
University of California IPM |
Western Grapeleaf Skeletonizer
The metallic bluish or greenish black western grapeleaf skeletonizer moths fly during the day. Body length is about 0.6 inch and the wing span is 1 to 1.3 inches. There are three generations per year in the Central ... [... more]
University of California IPM |
Eutypa Dieback
Eutypa dieback is not generally visible in vines younger than 5 to 6 years old and is seen most frequently in vineyards established for 10 or more years. The fungus survives in diseased woodand produces perithecia in ... [... more]
University of California IPM |
Crown Gall
Agrobacterium tumefaciens is systemic in grapevine wood. The pathogen can be transmitted by any agent that contacts the contaminated material. Galls commonly develop where plants have been suckered or injured during ... [... more]
University of California IPM |
Phomopsis Cane And Leafspot
Tiny dark to brown spots with yellowish margins occur on leaf blades and veins. Spots first show 3 to 4 weeks following rain. Leaf death may occur if large numbers of spots build up. Basal leaves with heavy infection ... [... more]
University of California IPM |
Leafhoppers
Leafhoppers overwinter as adults and are found in spring on basal grape leaves and weeds. The adult grape leafhopper is about 3 mm long and light to pale yellow with distinct dark brown and reddish markings. Eggs of ... [... more]
University of California IPM |
Branch And Twig Borer
The best way to manage branch and twig borer in vineyards is to prevent invasion and establishment of the beetles through cultural methods. Wood and brush piles of any kind of tree or shrub should be completely ... [... more]
University of California IPM |
Summer Bunch Rot (Sour Rot)
Chemical treatments are generally not effective in preventing summer bunch rot. In fact, research has shown that in the warmer areas of the San JoaquinValley, where Botrytis is a less important component of summer ... [... more]
University of California IPM |
