- Author: Belinda J. Messenger-Sikes
- Posted by: Lauren Fordyce
Many people think wild rabbits hopping around are adorable—there's even an international rabbit day celebrating wild and domestic rabbits—but they're less welcome when they're eating your carefully tended garden. Wild rabbits in California can devour your garden vegetables, just like Peter Cottontail. And they don't stop at lettuce and beans. Rabbits and hares will gnaw tree bark, flowers, most green vegetation, and even drip irrigation tubing.
UC Davis Wildlife Specialist Roger Baldwin has revised the Pest Notes: Rabbits and included more detailed management methods for jackrabbits, cottontails, and other wild rabbits. Managing...
- Posted by: Lauren Fordyce
- Author: Belinda J. Messenger-Sikes
Abiotic plant disorders are generally caused by environmental conditions, rather than microorganisms. They are sometimes called noninfectious diseases. Abiotic disorders can develop if a plant's needs are not being met. Abiotic disorders can not only damage a plant directly but could predispose trees and shrubs to attack by insects and pathogens. Disorders and pests often act in combination, such as when drought stress or root injuries make trees susceptible to bark beetles and root decay pathogens.
Common causes of abiotic disorders include too much or not enough water, compacted soil, nutrient deficiency (often caused by imbalanced soil pH), excess soil...
- Author: Karey Windbiel-Rojas
If you have eucalyptus trees, you might have noticed white, crusty growth on the leaves. Or maybe you saw a sticky, blackened mess of fallen leaves under a eucalyptus tree. These are signs of the redgum lerp psyllid, one of the most common psyllid pests that damages eucalyptus trees in California.
The adult psyllid is very small and as nymphs, they are concealed under a waxy cap, or lerp. As they feed, they excrete honeydew which can lead to the growth of black sooty mold, the source of those sticky leaves under the tree.
Although under biological control in coastal areas, this pest is still a problem under some growing conditions and on specific Eucalyptus species. Cultural practices to manage...
- Author: Casey Hubble
[Originally published in the Summer 2022 issue of the UC IPM Green Bulletin]
The three-lined cockroach, Luridiblatta trivittata, (Figure 1) is the smallest cockroach species in California, with adults averaging only 5–7 mm in length. This newly introduced cockroach is native to North Africa and the Eastern Mediterranean. It was first detected in California around 2004 in Marin County, but it was not positively identified until 2009. Since then the three-lined cockroachhas slowly expanded its range to include the entire San Francisco Bay Area, south to San Luis Obispo, east to the foothills of...
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