Are you surprised to see aphids on some of your plants this time of year? With the current mild temperatures in California, aphids may continue living and reproducing in some locations this winter, with female adults giving birth to live young every day.
Low to moderate numbers of aphids aren't usually damaging, but allowing them to continue reproducing on your plants may mean more aphids this spring. Once aphid populations explode in spring, their feeding can turn leaves yellow and stunt shoots on certain plants. Aphids can also produce a great deal of honeydew, a sticky byproduct of their feeding.
For information on how to manage aphids in many situations, consult the
- Author: Niamh Quinn
[From the Winter 2017 issue of the UC IPM Green Bulletin]
Rodenticides are essential tools in the IPM toolbox for rodent management. Exclusion and cultural practices, such as landscape management and sanitation, are also very important tools that should be considered when managing rodent populations. However, persistent and chronic infestations often require the use of rodenticides.
Rats (Fig. 1) and mice are vectors of disease such as plague, leptospirosis, and salmonellosis. Commensal rodents are also associated with the onset of.../span>
Many areas in California have experienced a hot and dusty summer, perfect conditions that favor spider mites! These tiny arachnids are plant pests whose numbers can get very high during the warm months of June through September.
Spider mites damage plants by sucking cell contents from leaves. If you see plant leaves with light dots on them (stippling) that turn yellowish or reddish and drop off, and/or large amounts of fine webbing on leaves, twigs, and fruit, your plants might have spider mites.
Spider mites look like tiny, moving dots that will move around rapidly when disturbed. To correctly identify these pests, use a 10x hands lens to view...
Many retail nurseries and garden centers sell lady beetles for controlling aphids in gardens and landscapes. Gardeners often ask, “Does releasing lady beetles really work?
University of California research has demonstrated that lady beetle releases can effectively control aphids in a limited landscape or garden area if properly handled and applied in sufficient numbers. However, because of inadequate release rates or poor quality, lady beetles often fail to provide satisfactory control; other low toxicity aphid management practices such as hosing off or insecticidal soap or oil sprays may be more effective. Here are some things to consider if you decide to try lady beetle releases:
If you grow roses, you might be noticing damage on the flowers caused by hoplia beetles (Hoplia callipyge). Hoplia beetles, which are common between March and May, especially in the Central Valley, feed on the blossoms of light-colored roses and other flowers in your landscape.
Hoplia beetle adults are small, reddish-brown scarab beetles that are often found resting inside a blossom. If you hold one in your hand, you'll notice that most of the body is a beautiful, iridescent silvery green color in the sunlight.
These beetles may also occasionally be found feeding on other plants with light-colored petals.
Some people believe they have the rose chafer or Japanese beetle in their landscape, however...