|I have a small greenhouse, plants, particularly angel trumpets, are covered with white flies. How can I get rid of them?|
|There are a number of biological controls that you can try to get rid of white flies. Since the problem is inside a greenhouse, there are several natural enemies that you can purchase to help control the white fly population.
A predacious wasp (Encarsia formosa) can be released inside the greenhouse to control white flies. The wasps are available through: Buglogical Services (http://www.buglogical.com/enca...), American Insectaries (http://www.betterbugs.com/Pric...), and Arbico Organics (http://www.arbico-organics.com...) among others.
Other control methods include yellow sticky traps - basically cardboard painted bright yellow and coated with mineral oil or petroleum jelly, and suspended near the tops of plants. Insecticidal soaps work well against white flies, too. Just be sure to spray both top and undersides of leaves. Insecticidal soaps can cause burning of leaves if applied during hot weather, so use caution.
Good luck in getting rid of those pesky pests!