This time of year, you may notice a white, powdery looking growth on fruit, vegetable plants or ornamental plants in your garden. What is it? It could be powdery mildew.
Powdery mildew is caused by several different fungi that may attack plant leaf surfaces, shoots, fruits, and flowers. There are several species of powdery mildew; all are spread by wind and thrive in shady areas when temperatures are between 60-80 °F. The fungi attack both new and old foliage, and can be a problem on certain plants. The disease usually occurs first on new leaves, before spreading to older parts of the plant. This is why over fertilizing worsens powdery mildew.
Ornamental Plants
Many woody and herbaceous...
- Author: Pamela Kan-Rice
The incurable citrus tree disease huanglongbing, or HLB, has been detected in Los Angeles and Orange counties and most recently in
[From the Summer issue of the UC IPM Retail Nursery & Garden Center News]
The incurable citrus disease huanglongbing (HLB) has been detected in dozens of backyard trees in Los Angeles and Orange counties and most recently in Riverside. The bacterium that causes this disease is spread from tree to tree by Asian citrus psyllids (Figure 1). HLB, also known as citrus greening, has already devastated the citrus trees in Florida, Georgia, Louisiana, South Carolina, and Texas. There is no known treatment for the disease, which usually kills the tree within three to five...
/span>The California Department of Food and Agriculture (CDFA) and the United States Department of Agriculture (USDA) have confirmed the detection of the citrus disease known as Huanglongbing (HLB), or citrus greening, in Riverside County. The disease was detected in plant material taken from a grapefruit tree...
- Author: Niamh Quinn
[From the May 2017 issue of the UC IPM Green Bulletin]
The West Coast Rodent Academy (WCRA) is a three-day intensive educational workshop hosted by University of California Cooperative Extension in association with the Pest Control Operators of California, Target Specialty Products and Univar. The event was recently held at the University of California's Agricultural and Natural Resources South Coast Research and Extension Center (SCREC) in Irvine, CA.
Managing rodents in urban environments can often be very challenging. The WCRA was created...
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