Answer: Budworm populations usually are held in check by a combination of predators, parasites, adverse climatic conditions, or inadequate food supply. Spiders, insects and a variety of birds are important predators. If you time it right, you can control the budworms with Bt (Bacillus thuringiensis) sold as Dipel in garden stores. You need to spray within 2-3 weeks of new growth (that's when the worms are most susceptible to the sprays).
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