Sign up for the
Weekly Harvest Newsletter!

Published every Wednesday, the Weekly Harvest e-newsletter is a free Web digest of sustainable agriculture news, resources, events and funding opportunities gleaned from the Internet. See past issues of the Weekly Harvest.
Sign up here

Sign up for the Weekly Harvest Newsletter

What Is Sustainable Agriculture?

Master Publication List

Search Our Databases

Urban Agriculture

Energy Alternatives

Beginning Farmer

Field Crops

Horticultural Crops

Livestock & Pasture

Local Food Systems

Food Safety

Marketing, Business & Risk Management

Organic Farming

Pest Management

Soils & Compost

Water Management

Ecological Fisheries and Ocean Farming

Other Resources

Sign Up for The Dirt E-News

Home Page

Contribute to NCAT


Newsletter sign up button

· Privacy Policy · Newsletter Archives

RSS Icon XML Feeds

RSS 2.0: Events, Breaking News, Funding Opportunities Atom: Events, Breaking News, Funding Opportunities


NCAT strives to make our information available to everyone who needs it. If you are a limited-access or low-income farmer and find that one of our publications is just not in your budget, please call 800-346-9140.


How are we doing?


Home  > Question of the Week

Question of the Week

Permalink What and when do I apply to crepe myrtles to prevent aphid damage?

Answer: Aphids overwinter as eggs and emerge in the spring, and continue to reproduce all season. They reach maturity in about 10 days, which makes for several generations each growing season. Because of their rapid life cycle, they are difficult to control with insecticides. Several species of predatory insects will feed on aphids, including ladybugs, green lacewings, and parasitic wasps.

Using insecticides will harm the good insects along with the bad, so spraying all season is seldom beneficial or economical. However, if you have an infestation and want to spray, I recommend a least-toxic pesticide such as insecticidal soap, horticultural oil, pyrethrins, or neem oil. A good source of information for least toxic and organic approved pesticides can be found in ATTRA's Biorationals: Ecological Pest Management Database.

Another useful resource is the ATTRA tipsheet Aphids — Botanical Control Formulations, which discusses the use of garlic, rosemary, papaya leaves, and mint to control aphids. Its references list can lead you to additional sources of information on this topic.



« I want to raise sheep. What is the best breed to buy? :: What can you tell me about soil nutrition for high tunnel tree fruit production? »


No Comments for this post yet...

Question of the Week Archives