Uninvited Guests: Hornworms

We had several of these guys drop in for lunch without an invitation this week. The ate a few plants to the stalk before we noticed them, they are on ice now.

5 thoughts on “Uninvited Guests: Hornworms”

  1. Pingback: Red Headed Blogger
  2. To avoid hurting butterflies, carefully treat just the infested plants. An even safer approach is to release trichogramma wasps which are inexpensive and very effective. Do not use Sevin. Although having a reputation being a low toxicity product, it is one of the most toxic products still on the market. Just as it says on the label, it is severely deadly to bees and other pollinators.


  3. By Howard Garrett

    As usual at this time of the year, we have some caterpillar problems. You can apply trichogramma wasps for the control of many worms such as canker worms or forest tent caterpillars. If they are already feeding, it’s too late to apply these tiny wasps for the control of other worms. In that case Bt sprays are needed. Details next.

    Various larvae, the worms of moths and butterflies, eat the buds, leaves and flowers of many different species of food crops and ornamental plants. These worms can be sprayed and killed with Bt products or citrus-based products. For better control, add one ounce of molasses per gallon of spray. The better approach is to release tiny wasps called trichogramma wasps. They are purchased at all organic garden centers and feed stores on 1” cards that contain about 3000 moth eggs. Simply pin the squares on tree trunks or on fences. The almost microscopic wasps emerge from the moth eggs (that look like sandpaper granules) and fly off to parasitize and destroy other pest eggs. Nothing works better for the control of greenworms, loopers, armyworms, pecan casebearers, tent caterpillars, webworms and other vegetarian worms. Trichogramma wasps must be put out before the pests hatch and start eating. Again Bt is the alternative if damage is underway.


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