How Hawk Moths Know Where to Lay Hornworm Eggs

deluxestogie

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Tobacco Hawk Moth (Manduca sexta) Smells with its Wings

If you have ever wondered how the moth that produces tobacco hornworms finds the right plants, even before any blossoms appear, this research has found the answer.

The Hawk Moth wings have stubby, porous, sensory hairs, and can smell various aromas.

"...they concluded that the moth's wings likely sense bitter flavors and the aroma of amines, which smell like rotting fish to us."
"...the wing only picked out two odors, pyrrolidine and piperidine, both of which are stinky amines found in the leaves of nightshade plants, on which tobacco hawkmoths prefer to lay their eggs."

And of course, tobacco is in the nightshade family.

Bob
 

StoneCarver

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I'd like to know how hawk moths find the tobacco in my basement that's in the process of color curing. I've found way more hornworms on them than on my plants outdoors on an order of like 20:1. What's weird is I brush and inspect each leaf when I bring it in. So, I'm pretty sure I'm not bringing in leaves with hawkmoth eggs on them. I have found stinkbug eggs on the leaves. Durn moths breaking and entering. Idk.
 

deluxestogie

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Hawk Moths are huge. They are sometimes called "hummingbird moths". They are just as noisy. But they are nocturnal.

In the 17 years that I've grown tobacco, I actually saw a Hawk Moth once. I was sitting out on my porch, smoking a cigar well after dark, when a bat-sized thing began to loudly bang into the windows behind me. I quickly realized that it was a very big moth. Using my extra-heavy, extra-thick, "Black Flag" brand fly swatter, I whacked it as hard as I could. It fell to the floor, paused, then flew upward again. It took me three good hits with that fly swatter to subdue it. Its wingspan was easily 6 inches.

Bob
 
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