Posts Tagged: walnut
Treatment Options for Management of Walnut Scale and Frosted Scale
Walnut scale (Figure 1) is an important economic pest of walnuts in California. High populations of...
Figure 1. The covering of a group of walnut scales forms a daisy shape. Removing the cover reveals the yellow adult females
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Figure 2. Ten weeks after the delayed-dormant application of IGRs, frosted scale populations were observed on untreated (A) and IGR-treated (B) trees. Photo B is from an excised branch of a CentaurĀ® (34.5 oz/acre)-treated tree, illustrating the lack of maturation of frosted scale resulting from the delayed-dormant IGR treatment.
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Figure 4. The average total number of crawlers emerged over the season was evaluated across treatments. P?0.01
Retired UC ANR Entomologists Support Ongoing Walnut Scale Research
Two UC ANR entomologists, Walter Bentley, IPM Advisor emeritus, and Richard Coviollo, Entomology...
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Walnut Scale: an insidious pest of walnut in California
Walnut scale (Quadraspidiotus juglansregiae) is a common pest of walnut throughout California's...
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Walnut Twig Beetle: How a 'Failed' Research Project Led to Success
A scientific research project may initially be deemed a failure, but failure can lead to...
Forest entomologists Jackson Audley (left) and the late Steve Seybold next to a black walnut tree, the victim of thousand cankers disease, in downtown Davis. (Photo by Kathy Keatley Garvey)
The walnut twig beetle is about the size of a grain of rice. In association with a fungus, it causes thousand cankers disease. (Photo by Kathy Keatley Garvey)
UC Davis Students Carry on Legacy of Walnut Twig Beetle Expert Steve Seybold
The legacy of chemical ecologist Steven Seybold thrives with the recent publication...
The walnut twig beetle, Pityophthorus juglandis, in association with a fungus, causes the thousand cankers disease. (Photo by Kathy Keatley Garvey)
Forest entomologist Jackson Audley (left) with his mentor, the late Steve Seybold, in front of an infested tree in Davis, Calif. The walnut twig beetle, in association with a fungus, causes thousand cankers disease. (Photo by Kathy Keatley Garvey)
UC Davis doctoral student Crystal Homicz (right) participating in a forest entomology open house at the Bohart Museum of Entomology. With her is Professor Lynn Kimsey, director of the Bohart. (Photo by Kathy Keatley Garvey)