Comments on: Tomato Hornworm Defoliation http://www.gardenfork.tv/tomato-hornworm-defoliation Cooking, DIY, Gardening, Green Videos & Podcasts Fri, 10 Feb 2012 03:51:56 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Amanda http://www.gardenfork.tv/tomato-hornworm-defoliation#comment-19393 Amanda Sun, 18 Sep 2011 19:54:52 +0000 http://gardenfork.tv/blog/?p=18#comment-19393 We have found Thuricide to be an effective remedy when we found a solitary Hornworm starting the defoliation process on our tomato plants. Thuricide is a natural and organic alternative to chemical pesticides. It's a liquid formulation of the bacteria Bacillus Thuringiensis (Bt), which is an organism that effectively kills leaf eating caterpillars including loopers, cabbage worms, tomato horn worms, leaf rollers, gypsy moths and many others. We have found Thuricide to be an effective remedy when we found a solitary Hornworm starting the defoliation process on our tomato plants. Thuricide is a natural and organic alternative to chemical pesticides. It’s a liquid formulation of the bacteria Bacillus Thuringiensis (Bt), which is an organism that effectively kills leaf eating caterpillars including loopers, cabbage worms, tomato horn worms, leaf rollers, gypsy moths and many others.

]]> By: Hamilton http://www.gardenfork.tv/tomato-hornworm-defoliation#comment-127 Hamilton Sat, 06 Oct 2007 07:17:03 +0000 http://gardenfork.tv/blog/?p=18#comment-127 On the premise that an ounce of prevention is worth a pound of cure, I did a bit of googling around. This one guy somewhat vaguely says on the Organic Gardening Forum at http://forums2.gardenweb.com/forums/load/organic/msg0210594620482.html that "I pinch the first or second leaf stem just hard enough to bruise it which causes the plant to produce an enzyme that is LETHAL to Hornworms. I have used this tech for 10 years and have not had one hornworm make it to adulthood." PNAS (Proceedings of the National Academy of Sciences of the US) has an article at http://www.pnas.org/cgi/content/full/102/52/19237 that elaborates. Any mechanical damage or herbivory (chewing upon) induces tomatoes to produce "proteinase inhibitors (PIs), which are expressed rapidly and systemically in response to wounding." The short version is, in response to localized damage a whole tomato will plant will interfere with mr. hornworm's metabolism and he'll die. Yay! If it doesn't work, as a backup try delivering the chemical to the hornworm via a tea spray... of tomato plant tea. My mother says she recalls Crockett, the Victory Garden guy, saying that if you clip off hornworm-chewed stems and make a tea, and spray that on the tomatos, that it will kill off the worms. On the premise that an ounce of prevention is worth a pound of cure, I did a bit of googling around. This one guy somewhat vaguely says on the Organic Gardening Forum at http://forums2.gardenweb.com/forums/load/organic/msg0210594620482.html that “I pinch the first or second leaf stem just hard enough to bruise it which causes the plant to produce an enzyme that is LETHAL to Hornworms. I have used this tech for 10 years and have not had one hornworm make it to adulthood.” PNAS (Proceedings of the National Academy of Sciences of the US) has an article at http://www.pnas.org/cgi/content/full/102/52/19237 that elaborates. Any mechanical damage or herbivory (chewing upon) induces tomatoes to produce “proteinase inhibitors (PIs), which are expressed rapidly and systemically in response to wounding.”

The short version is, in response to localized damage a whole tomato will plant will interfere with mr. hornworm’s metabolism and he’ll die. Yay!

If it doesn’t work, as a backup try delivering the chemical to the hornworm via a tea spray… of tomato plant tea. My mother says she recalls Crockett, the Victory Garden guy, saying that if you clip off hornworm-chewed stems and make a tea, and spray that on the tomatos, that it will kill off the worms.

]]>