Aphidius ervi


SKU: WRAE250

These are live insects and MUST be shipped OVERNIGHT. No USPS or ground shipping.

Aphidius Ervi is  parasitic wasp used for natural aphid control mostly in greenhouses producing vegetables and ornamentals. Adult wasps are black 4-5 mm long. Adult females lay eggs from their abdomen by quickly curling their abdomen and puncturing an aphid simultaneously with its ovipositor. The egg once inside the aphid will hatch into a larva and consumes the aphid. The larvae when fully grown will cut a slit in the carcass and attaches it to a fixed object. The larvae then pupates (spins a cocoon) inside the dead aphid. The mummified aphid swells into a characteristic round, golden brown mummy. The emerging adult will cut a symmetrical hole at the bottom end to escape from the mummified aphid.After injecting the aphid with an egg it takes about a week for the mummy to form and then another week for the adult to appear. Each female can lay more than 100 eggs. 

LIFE CYCLE: Aphidius Ervi work by laying eggs in aphids and each adult is capable of laying 200-300 eggs. The larvae develop inside the aphids and then kill them by drying them out into hollow shells using a process called endoparasitism. This insects spends two weeks in the larvae stage before becoming an adult. The average lifespan of an adult is two weeks. 

RELEASE INSTRUCTIONS: Upon receiving your shipment, release at sundown the same day. These insects cannot be stored and should be released the same day. To release, open the container in the crop and allow the wasps to fly out on their own as you walk among the plants. You can speed up their exit by gently tapping them out. If they begin to exit too quickly or if dispersal control is not manageable (which may happen when they’re warm), re-secure the cap between release points. Concentrate the bulk of them at release points on or near the most heavily infested plants or where aphids are most likely to make an appearance. 

For any that will not readily come out of the bottle, or if some remain non-emerged, simply tuck the bottle into the foliage of a plant, preferably one with the heaviest pest population. The “mummies” may also be sprinkled out. I recommend the removal of most yellow sticky traps prior to release. Do not store the emerged adult wasps in the bottle for more than 18 hours. Hold at a humid 45-55°F (fridge best). Do not attempt to cold-store the wasps’ pupae for periods exceeding 72 hours.

RELEASE RATES: *Note: These rates are for preventative control only, multiple releases and/or higher quantities are necessary for heavier infestations. Click each product pic to get more information about that product.

 

QUANTITY PER PACKAGE
APPROX. COVERAGE
250 100 sq. ft.
500 200. sq. ft.