Keep up to date with

Special Gift Offer
URL:
http://www.gardengatemagazine.com/newsletter/2007/07/24/tomato-hornworm/
Share:

Tobacco hornworm

By: Garden Gate staff
These 3- to 5-inch-long giants of the caterpillar world have a large harmless spike, or horn, on their tails. Their green color blends into the foliage of tomato and tobacco plants, some of their favorite foods.

pest watch

Tobacco hornworm Manduca sexta

IDENTIFICATION – These 3- to 5-in.-long giants of the caterpillar world have a large harmless spike, or horn, on their tails. Their green color blends into the foliage of tomato and tobacco plants, some of their favorite foods. They also eat plants in the nightshade family, such as datura, petunia and nicotiana.

DAMAGE – In early to midsummer, caterpillars can quickly strip a plant of foliage and may sometimes even chew on green tomatoes.

CONTROL – If numbers are small, handpick caterpillars; spray Bt on affected leaves only (thuricide, which contains the kurstaki strain of Bacillus thuringiensis, works well on tobacco hornworm and is safe to spray right up to harvest, but be sure to wash fruit well before eating); grow alyssum, dill or Shasta daisy to attract braconid wasps, which lay dozens of eggs within each larva, parasitizing and killing it.

Published: July 24, 2007
Share:
Tags:
  • None

Also in This Newsletter


Last Week’s Newsletter

July 17, 2007

Video: Watering hanging plants

If you live where it’s hot and dry, you’re probably spending lots of time watering, especially if you have containers. Here are some tips and a tool to help make that task easier and more enjoyable.

Pepperweed

If you crush or bite into a pepperweed seed pod, you’ll know where it gets its name. It has a definite pungent scent and taste. A biennial, pepperweed sprouts in the fall and spends the winter as a small rosette of leaves.