Garden Pest Solution: Encarsia & Delphastus,
Biological Whitefly Control
Encarsia (Pronounced: EN-CAR-SEE-A)
Encarsia is a tiny black and yellow parasitic wasp about 1mm in length. Adult females lay their eggs into whitefly scales (the static, sap-sucking whitefly larvae).
Encarsia Life Cycle:
An adult female will lay up to 60 eggs during her short lifetime of 10 to 14 days. Whitefly scales that have been parasitised by Encarsia turn black after about 10 days. Development from egg to adult takes about 28 days at 20°C or 14 days at 30°C.
- Encarsia should only be used in greenhouses or conservatories.
- Encarsia should be introduced at the first sign of whitefly, yellow sticky traps can be used to monitor when this is.
- If temperatures are not high enough, use Eradicoat to keep the numbers down before Encarsia can be introduced.
- If the whitefly population is already high, it is necessary to spray first with Eradicoat to reduce the numbers. It may also be necessary to repeat Eradicoat sprays after Encarsia are introduced, to help establish control at low whitefly levels. In this case, apply Eradicoat only to leaves that are densely infested with scales or adults. Generally, scales will be found on slightly older leaves and adults on young leaves towards the growing point of shoots. Spray undersides of leaves, where most of the whitefly are located.
- Encarsia cannot be stored, and should be used on the day of receipt.
- Temperatures should not fall below 10°C (50°F) at night, Encarsia will be most effective when temperatures are at least 18°C (64°F) during the day.
- Encarsia may not work well on daturas or regal pelargoniums.
- Like all Defenders biological controls, Encarsia is harmless to children, pets and wildlife and will not become a pest in its own right.
Delphastus (Pronounced: DEL-PHAS-TUS)
Delphastus is a member of the ladybird family, it is a small black beetle. Both its larvae and adults feed on eggs and larvae of whitefly. Delphastus is a voracious feeder and can consume up to 150 whitefly eggs in a day. Delphastus larvae are small and pale yellow in colour.
Delphastus Life Cycle:
Females can lay up to 3 eggs a day, and will live for up to 60 days. The life cycle from egg to adult will take 21 days at 28°C.
- Unfortunately, Delphastus is no longer available. Use Eradicoat for dense patches of whitefly.
Biological Whitefly Control Product Details
Defenders supply Encarsia as parasitised whitefly scales, these are supplied in tubes attached to hanging cards and simply hung amongst the plants. The programmed delivery is recommended to give control over the entire whitefly life cycle. The single treatment is properly used for additional top-ups.
Eradicoat is supplied in bottles of concentrate.
|Product Code||Area Treated||Price|
|ENC01||Contains 750 Encarsia enough to treat up to 60m² (70yd²).||£6.95|
|ENC13||Is a programme of 3 deliveries of 750 Encarsia sent at fornightly intervals.||£14.95|
All packs of Encarsia and Eradicoat are sent with complete instructions, and a free information sheet on Biological Whitefly Control entitled "Your Questions Answered" .
Remember! Biological controls are living creatures and can be effected by chemical usage. If you've used any persistent pesticides recently, check with us before ordering Encarsia. As a general rule stop using pyrethrum 4 days before, derris 1-2 weeks before and soft soap insecticides 1 day before releasing Encarsia.