Chrysoperla carnea, lacewing
Adult lacewings are 23 - 30 mm in size, they have a slim yellow-green body. They have big wings with some minor veins in them. Eggs are green-white coloured and they are deposited on stalks of 1-2 cm. Larvae have big jaws and very well developed legs. Larvae are creamy-white colured with 2 dark bands alongside their body. The final larval stage pupates into a white round cocoon. Remains of aphids that are attacked by the lacewing larvae are not easy recognizable; they are fully shriveled.
Mode of action:
Lacewing larvae prefer aphids as their food source but they may consume other insects and mite as well, even beneficials may be preyed upon. Adult lacewings feed themselves with pollen, nectar and honeydew. Larvae are most active during the night and hide during day time on hidden places on and around the plants. They hunt for their prey and as soon as they have got hold of some prey they inject some saliva to make digestion more easy. Afterwards the prey is sucked empty. A singel lacewing larva may eat up to 300 - 400 aphids of different size during development into pupa.
Lacewing larvae may be used in greenhouse cultures as well as indoor plantscapes against aphids but also in urban green and against woolly beech aphid in nurseries. The product is not particularly useful in more high-up grown crops. Especially in greenhouse crops keep in mind that CHRYSOPA may also prey upon other biocontrol agents. Apart from aphids CHRYSOPA may also prey upon ogher pests such as whitefly of thrips. CHRYSOPA is mainly introduced whenever a quick clearance is needed; introduction in hot spots of infestation. Lacewings will only very rarely establish a population within a greenhouse so consider regular repeated introductions. The product is sensitive to several chemicap pest control products. Ask for advise on application technique.
effect of CHRYSOPA:
- immediately after introduction larvae start with feeding themselves on pest organisms present
- larvae are rather mobile; however they will not disperse over bigger distance within a greenhouse
- pupae are found incidentally
- adult lacewings will hardly produce any eggs in the greenhouse; they tend to fly away
The product CHRYSOPA
bottle of 500 ml containing 1000 lacewing larvae (second stage) in buckwheat.
maximum 2 days at 6-10°C laying in the dark.
Adult lacewings die at temperatures above 35°C. When temperature stayes below 35°C for a longer period of time there will be no full development. Larvae remain active at lower temperatures; around 13°C they are still active.
- mainly used against all kind of aphid species
- of minor use against other pests such as mealybugs