Adults are black, approx. 1,5 mm in size. Females are black but have a brown coloured head. Larvae are grey/white, they have short hairs on their back. Pupae are orange/yellow, more or less round-shaped.
Mode of action:
Delphastus is effective both against greenhouse whitefly as well as tobacco whitelfy. Adults and larvae prey upon whitefly eggs and larvae by sucking them. After being preyed upon only an empty skin remains of egg, larva or pupa of the whitefly. Presence of the typical yellow faeces on the leaves do indicate preying activity of the beetles. Adults prefer eggs of whitefly as their prey; more often you can find them in the upper parts of the plant. For their reproduction the predators need a considerable number of whitefly eggs. Sometimes the adult beetles look as if they are dead; they can hide legs and head beneath their scale cover. Adult beetles are good searchers; inside a greenhouse they are able to locate hot spots of whitefly accurately. Larvae are not very much moving around. Most of the time they stay around spots where they were born.
Delphastus is being used in greenhouse cultures as well as indoor plantscapes. Whitefly larvae that are parasitized have a low incidence of predation so predatory beetles and parasitoids such as Encarsia formosa and Eretmocerus eremicus may be used next to each other. Delphastus is of (sub)tropical origin so will not survive outdoors in northern european countries during wintertime. In greenhouses the predators will remain active through wintertime although activity will be far less than during summer time. Preventative introductions are not recommended since Delphastus needs presence of whitely for their survival. In greenhouse conditions repeated introductions are recommended. The beetles are sensitive for chemical pest control products. Ask advice for proper introduction strategy.
effect of DELPHIBUG:
- introduce in hot spots of whitefly
- eggs as well as young larvae of whitefly are being preyed upon
- first larvae appear 3-4 weeks after introduction on underside of leaves
- pupae mostly on lower part of the plant, along veins
- first new adults appear 5-6 weeks after introduction
The product DELPHIBUG
Product: tube with 1000 adult beetles in buckwheat
Shelf life: 1-2 days at 12-14°C, in the dark (tube horizontally).
Climate: minimum temperature 20°C, optimum at 22-30°C. Temperatures to 35oC will not be harmfull to Delphastus.
- greenhouse whitefly
- tobacco whitefly