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Article: Attack Of The Tomato Hornworms! Controling the Tomato Hornworm: Bt questions

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TexasTammy
Pearland, TX

August 11, 2008
12:37 PM

Post #5398564

My tomatoes are frequently attacked by tomato hornworms. I read about using Bt, but I wasn't sure it would be effective. Doesn't it take days to work? I wondered if the worms would continue their destruction while I waited for the Bt to affect them. Also, does Bt prevent the hornwoms from attacking? I wondered if I should use it frequently to prevent the attacks -- my plants are often stripped before I realize the worms have arrived.

melody

melody
Benton, KY
(Zone 7a)


August 11, 2008
12:54 PM

Post #5398622

It won't prevent an attack. The hornworm has to eat part of a treated plant. After eating the treated leaf, they still will live for a few days, but they have little desire to eat.

Rainwater washes it off, and sunlight will degrade the Bt after a few days also. It is usually most effective when you have a great number of plants that you can't hand-pick.

It isn't like putting a pesticide on your plants. It acts totally different. It is effective on all caterpillars, so if you encourage butterfly cats, think twice about spraying it.

Sheila_FW

Sheila_FW
Fort Worth, TX
(Zone 8a)

August 11, 2008
1:55 PM

Post #5398946

Yes think before using any pesticides... our butterflies are in short supply now!

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