Tobacco Hornworms on Nicotiana

We have two Nicotiana plants, also known as flowering tobacco, being raided by the tobacco hornworm. Want to know how to tell the difference between a Tobacco Hornworm and Tomato Hornworm?

The tobacco hornworm is generally green with seven diagonal white lines on the sides and a curved red horn. The tomato hornworms have eight V-shaped marks on each side and their horn is straighter and blue-black in color. These hornworms are the larvae of hawk or sphinx moths.

The plants were cutback today to promote new growth and I'll probably spray later this evening with Southern Agriculture Thuricide, a product that contains Bacillus thuringiensis (BT). I used BT a month ago and with one treatment it worked very well to get rid of the caterpillars. The trick is to spray in the evening because BT degrades quickly in sunlight.

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