They might be the squash bug they suck the life out of thenplants. https://www.google.com/search?q=squ...XJ4APSjIHoBA&ved=0CAkQ_AUoAA&biw=1024&bih=644
We get them and the squash big borer that bores holes into the stem basically killing the plant. I have miraculously been about to grow muskmelon/cantaloupe this year I think because of the weeds and hiding them in the tomatoes. Usually those buggers get them early here. The only squash I can grow easily here is the Seminole pumpkin. It isn't a pumpkin in our traditional sense. It is a squash that was grown in FL by the Seminole Native Americans. It produces smallish fruit that taste great when they can fully ripen and stores for a good amount of time.
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I did some research last night & came to that conclusion as well. Apparently wearing at night encourages them and that's usually when I water.
I found some natural way to defeat them so today I will be making up some spray to see if it works. I finally have some pumpkins growing and don't want to lose them. Especially since the girls ate 2 of the small ones :/