The Asian Citrus Psyllid (ACP) is a small, aphid-sized insect that poses a serious threat to California's citrus trees. This invasive pest can carry and transmit a fatal bacterial disease called Huanglongbing (HLB) to all citrus species. HLB has already decimated citrus groves throughout Florida, costing the citrus industry millions of dollars. The psyllid is currently present in Southern California, but preventative measures can keep the disease and insect from spreading to California's citrus growing regions.
What does the Asian citrus psyllid look like?
Asian citrus psyllid adults are 1/6 to 1/8 inch long with brown wings and red eyes. They feed on plants at a 45-degree angle, with their...
The 10th annual California Invasive Species Action Week (CISAW) will kick off Saturday June 3rd and runs to Sunday June 11th. This week is designed to raise awareness and encourage public participation in the ongoing fight against invasive species. These invaders are non-native plants, animals, or pathogens that can negatively impact our waters, native ecosystems, agriculture, health, and economy. Every day this week we will be spotlighting a different invasive species and its impacts.
You can participate during Action Week and all year long by doing the following:
- Check out UC IPM's previous blog posts on
The invasive pest spotlight focuses on emerging or potential invasive pests in California. In this issue we are covering the emerald ash borer.
Emerald Ash Borer Facts
The emerald ash borer is a small (roughly 3/8 to 5/8 inches long) beetle with metallic green wing covers and a coppery red or purple abdomen. While there are other metallic wood-boring beetles, the emerald ash borer's body is longer and more cylindrical than others. Adults feed on the edges of leaves and lay eggs under tree bark flaps and in bark crevices. Once the eggs hatch, the larvae burrow into the tree to feed, creating S-shaped galleries in the wood. This disrupts the flow of nutrients through the tree and causes branch...
- Author: Belinda J. Messenger-Sikes
The jumping worm, Amynthas agrestis, is an invasive earthworm capable of harming native forests that has been recently reported in some areas of California. This pest devours leaf litter and other organic matter, changing soil texture and nutrient availability to a point where some plants may be unable to survive. Its feeding can lead to a decline in diversity and population of native plants and other organisms within forests.
Although these worms are native to eastern Asia, they have been detected in dozens of states; including Massachusetts, New York, Wisconsin, and Minnesota. Jumping worms have since moved west to Washington...
Ripe, juicy, sweet blackberries: what's not to love? Blackberries are grown for us to eat and enjoy, but some species can be considered weeds when they take over home landscapes, roadsides and waterways, and other areas. The most problematic species are the introduced wild blackberries, cutleaf blackberry and Himalayan blackberry. Blackberries can be highly competitive, smothering existing plants with their dense stands. Accumulation of dead stems can create a dangerous fire hazard.
In urban landscapes, blackberry brambles can create habitat and food for wildlife and birds, but also for rats and other pests. When invasive wild blackberries take over a...