- Author: Belinda Messenger-Sikes
After years of drought, we welcome rain in California. But we also recognize that rain can help spread a number of plant diseases. Rain and wind can splash bacteria and fungi from infected leaves, branches, and blossoms to uninfected parts of the tree. The fungal diseases anthracnose, peach leaf curl, scab, shot hole blight, and the bacterial disease fire blight can all be spread by rain splash. This ability to spread by water makes these diseases more common after a wet spring. With 2023 bringing quite a bit of rainfall and 2024 looking similarly wet, we want to focus on some common rain-dispersed diseases.
Anthracnose
Anthracnose affects many trees including almond, citrus, Chinese elm, and...
/h2>- Author: Dong Hwan Choe
- Author: Chow-Yang Lee
- Author: Michael K Rust
Ants are one of the major seasonal pests around structures in California's urban environments. Pest management companies throughout the state report that ants are responsible for a significant proportion of their pest control services. In urban residential areas of California, the Argentine ant, Linepithema humile, is the most common nuisance ant species treated by pest management professionals (PMPs) as well as the public themselves (Figure 1).
While contact insecticides are frequently used to control Argentine ants, they also contribute to environmental contamination via drift and runoff. However, insecticide applications following California's recent regulatory changes and label updates may fail to control...
- Author: Niamh M Quinn
- Author: Roger A Baldwin
- Author: Carolyn Whitesell
Pocket gophers can cause significant damage to valuable turf, girdle trees, and chew irrigation lines. Their mounds can create tripping hazards and lead to erosion concerns when found on slopes. Luckily there are multiple successful management options to choose from when it comes to managing pocket gophers.
Do I have a pocket gopher?
Pocket gophers are small burrowing rodents that are often identified from the damage they cause rather than a sighting of the animal itself. Pocket gophers spend most of their time below the surface and while it is possible to see them above the ground, or peeping out of a burrow (Figure 1), the easiest way to determine the presence of pocket gophers is by the...
/h2>- Author: Lauren Fordyce
Follow these general tips for the month of March to prevent pests in the garden and landscape. To view more tips specific to your region, visit the Seasonal Landscape IPM Checklist on the UC IPM website.
- Look for aphids and their natural enemies such as predaceous bugs, lacewings, lady beetles, and syrphid flies. On small plants, spray a strong stream of water or apply insecticidal oils or insecticidal soaps to kill them.
- Author: Lauren Fordyce
If you've used disinfecting wipes to clean surfaces in your home, an herbicide to control weeds in your garden, or insect repellents while on a hike, then you have used a pesticide. A pesticide is any material (natural, organic, synthetic, or even homemade remedies) that is used to control, prevent, kill, or repel a pest. Pesticides are designed to be toxic against certain pests like weeds, insects, or bacteria. But when they are not used properly, pesticides can also be toxic to people and pets, and harm the environment including water quality, pollinators, and natural enemies.
February is National Pesticide Safety Education Month, a time to raise awareness about...