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Old 07-17-2016, 07:20 PM
 
392 posts, read 751,723 times
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I think I am experiencing a new problem with our tomatoes. Some leaves curl and decay turning black in color, when I unfold the leaves I find lots of black droppings. The decay looks like frost decay. Will try to take pictures tomorrow if I found more decayed leaves. I just sprayed use norm oil last week.
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Old 07-17-2016, 08:38 PM
 
Location: East of Seattle since 1992, 615' Elevation, Zone 8b - originally from SF Bay Area
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You no doubt have the infamous tomato hornworm. Those are their droppings, and they lay eggs on the underside of the leaves, the curling protects them. Cut off and burn or throw the affected leaves in the trash. If not too many you can try to find them pick off and stomp. You can also treat with BT, which is a bacteria safe for beneficial insects and can be applied right up to harvest time.
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Old 07-20-2016, 07:42 PM
 
Location: Denver/Boulder Zone 5b
1,371 posts, read 3,691,780 times
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Quote:
Originally Posted by Hemlock140 View Post
You no doubt have the infamous tomato hornworm. Those are their droppings, and they lay eggs on the underside of the leaves, the curling protects them. Cut off and burn or throw the affected leaves in the trash. If not too many you can try to find them pick off and stomp. You can also treat with BT, which is a bacteria safe for beneficial insects and can be applied right up to harvest time.
^ This.^

Hornworms are pretty easy to deal with, but you must act quickly at the first sight. Where there is one there are usually more and they are SNEAKY. Even though they can get larger than your middle finger (ew, by the way), they are notoriously difficult to find. 3 or 4 mature worms can strip a tomato plant overnight.

I hand picked them last season, as I only had a few, but the season before I used BT with excellent results.
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Old 07-21-2016, 06:10 AM
 
392 posts, read 751,723 times
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Yesterday I sprayed with neem oil. Folding each leaf to spray it thoroughly, found a worm nestled inside munching on the leaf. They are really sneaky. I think our most mature plant is the one hardly hit by the pest, hope it's not too late to be saved.
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