Posts Tagged: lady bugs
Mark your calendars! The next open house at the Bohart Museum of Entomology, located in Room 1124 of the Academic Surge Building on Crocker Lane, UC...
Booklice are nearly microscopic insects, Liposcelis bostrychophila, or "psocids" (pronounced "so kids"). They are common pests in stored grains. (Photo by Kathy Keatley Garvey)
A lady beetle (aka ladybug) is a beneficial insect in the garden. It eats aphids and other soft-scale insects. (Photo by Kathy Keatley Garvey)
Monarch butterflies aren't the only insects that like milkweed. Honey bees, lady beetles and aphids, do, too. We found all three insects, plus a...
Labor Day activity: A honey bee and a lady beetle (see center of blossoms) forage on a scarlet milkweed. (Photo by Kathy Keatley Garvey)
Oleander aphids also like the scarlet milkweed (along with honey bees and monarch butterflies). The milkweed is the host plant of the monarch butterfly but this plant "hosts" other insects, too. (Photo by Kathy Keatley Garvey)
A monarch butterfly laying eggs on a scarlet milkweed. (Photo by Kathy Keatley Garvey)
Sometimes in a world of towering skyscrapers, jumbo jets and warehouses big enough to hold a small planet--or at least a state the size of...
A lady beetle, a monarch caterpillar and an infestation of oleander aphids. (Photo by Kathy Keatley Garvey)
An oleander aphid on "the nose" of a monarch caterpillar. (Photo by Kathy Keatley Garvey)
An oleander aphid on the back of a monarch caterpillar. (Photo by Kathy Keatley Garvey)
An oleander aphid crawling on a tentacle of a monarch caterpillar. (Photo by Kathy Keatley Garvey)
Think of them as "the good guys" and "the good girls." Insects such as lacewings, lady beetles and flower flies. We're delighted to see that the...
A syrphid fly, aka flower fly or hover fly, nectaring on a tower of jewels. (Photo by Kathy Keatley Garvey)
A lacewing glows in the afternoon sun. Larvae eat such soft-bodied insects as mealybugs, psyllids, thrips, mites, whiteflies, aphids, small caterpillars, leafhoppers, and insect eggs, according to the UC IPM website. (Photo by Kathy Keatley Garvey)
The lady beetle, aka ladybug, is well known for its voracious appetite of aphids. (Photo by Kathy Keatley Garvey)
Lady beetles sold at nurseries for aphid control are convergent lady beetles, named for the converging white marks on its thorax. Suppliers collect beetles from large overwintering aggregations in California's foothills and mountains. Many other species of lady beetles occur naturally in California landscapes but don't aggregate in the mountains and aren't sold commercially.
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:
Lady beetles deteriorate rapidly if not handled properly. Lady beetles need to be kept refrigerated until they are released. Live lady beetles on display in stores are attractive for customers, but beetles left out at room temperature rapidly deteriorate. Also, lady beetles are often dehydrated and need water, especially if they have been held at room temperature, even for a few hours. Stores or gardeners are advised to mist lady beetles with water in a squirt bottle before placing them in the refrigerator for storage, making sure not to let water puddle in containers. When purchasing lady beetles, inspect the container and make sure almost all beetles are alive. Lady beetles purchased from primary suppliers (those who obtain beetles directly from collectors) may be healthier than those held in stores for several weeks.
Use adequate release rates. UC research shows that high numbers of lady beetles are required to control aphids. One large, heavily infested rose bush in the landscape required two applications of about 1,500 lady beetles each, spaced a week apart. Most packages sold in stores contain only enough lady beetles to treat one aphid-infested shrub or a few small plants. Larger qualities can be purchased from online lady beetle suppliers.
Lady beetles need a good supply of aphids. There is no point in releasing them on plants with few aphids. Lady beetles are voracious aphid feeders and an adult beetle will eat 50 or more aphids a day. The convergent lady beetle, which is the species sold for release, feeds almost entirely on aphids and will not remain on plants with low aphid populations and will not control other garden pests.
Release lady beetles at dusk or early evening. Lady beetles will fly away almost immediately if released during the heat of the day or where the sun is shining, so wait until evening to release them. Spray a fine mist of water on the plants before the release. Giving beetles a drink may keep them around longer. Place beetles at the base of plants or in the crotches of low branches. Lady beetles will crawl higher into the plant in search of aphids. Once lady beetles begin to fly, they are likely to fly a substantial distance, often outside the boundaries of your garden. Don't release lady beetles on plants that have been sprayed with insecticides. Residues from most insecticides are likely to kill the beetles. However, insecticidal soaps and oils, once dry, won't leave toxic residues.
Expect lady beetles to fly away in a few days. Even when released with care, lady beetles will fly away within a few days. About 95 percent of released beetles in research studies flew away within 48 hours. The remainder were gone within 4 or 5 days. Lady beetles are unlikely to lay eggs on the plants they are released on. If aphids return a week or two later, gardeners will need to release more lady beetles, hose aphids off with water, use insecticidal soap sprays, or wait for other native aphid natural enemies to fly in.
See the convergent lady beetle page in UC IPM's Natural Enemies Gallery for information about its life cycle and view journal articles about UC research on lady beetle releases for controlling aphids.
This article was modified from the original version published in the June 2011 issue of the Retail Nursery and Garden Center IPM News.