Chrysopidae - Green Lacewing

lacewing cycle
Lacewing Larva
Lacewing Larva
Green lacewing adults

Green lacewing (scientifically known as Chrysoperla rufilabris or Chrysoperla carnea) is widely used in various situations to control many different pests. Many species of adult lacewings do not kill pest insects, they actually subsist on foods such as nectar, pollen and honeydew. It’s their predacious offspring that get the job done. If you’re looking for effective aphid or Psyllid control, lacewing larva should help do the trick.

The adult lacewing lays her eggs on foliage where each egg is attached to the top of a hair-like filament. After a few days the eggs hatch and a tiny predatory larva emerges ready to eat some aphid pests.

Lacewing larvae are tiny when emerging from the egg, but grow to 3/8 of an inch long. They’re known as aphid lions since they voraciously attack aphids by seizing them with large, sucking jaws and inject a paralyzing venom. The hollow jaws then draw out the body fluids of the pest, killing it. Of all available commercial predators, this lacewing is the most voracious and has the greatest versatility for aphid control in field crops, orchards, and greenhouses.

Each green lacewing larva will devour 200 or more pests or pest eggs a week during their two to three week developmental period. After this stage, the larvae pupate by spinning a cocoon with silken thread. Approximately five days later adult lacewings emerge to mate and repeat the life cycle. Depending on climatic conditions, the adult will live about four to six weeks.

Each adult female may deposit more than 200 eggs. For best results, habitats should encourage the adults to remain and reproduce in the release area. Nectar, pollen, and honeydew stimulate their reproductive process. If these food sources are not available, adults may disperse. An artificial diet called Wheast is available to provide the adults with the necessary nutrition they need for reproduction. Wheast powder mixed with sugar and water is used at beneficial insectaries to help mass-rear the lacewing. Studies by universities and the USDA have shown that spraying field crops with a Wheast/sugar/water mixture increases egg laying considerably. Green lacewing adults can survive the winter in protected places but have a difficult time surviving cold winters. 

 

 


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