Options for controling sunflower stem boring bugs

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2QandLearn Menifee, CA(Zone 9a) Aug 01, 2011

I have volunteer sunflowers every year, but around July-August they begin to show signs of stem boring bugs, and it makes their flowers not develop properly, sometimes leading to stems bending over, & whether they do that or not, they do die back. Thus they become quite unsightly.

Would it help if I didn't allow them to grow every year, but pulled them all out every other year, instead? Or would that help at all? I don't know which bug it is, as the grubs I find are bright yellow, instead of the white I've seen pictured online.

I cannot use chemicals, so please do not suggest using them.

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