I get striped worms in lots of plants - phlox, peppers, weeds - anything. Most of mine are not at the base and so I don't lose the whole plant. I usually lose the whole stem trying to find the worm but not always. I am glad you reminded me to dust my dahlia because they are the worst when they get borers. You don't know it until the wind blows and the your dahlia breaks because of borers. I assume a moth lays the egg on the stem and them the cat enters the stem and eats.
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