What do you spray on evergreen shrubs with cobwebs but no spiders?

If you find cobwebs on evergreen shrubs without visible Spiders, it's likely due to spider mites or other pests. You can spray the shrubs with a solution of insecticidal soap or horticultural oil, which helps suffocate and control these pests. Additionally, a strong stream of water can help dislodge any webs and pests present. Always test any treatment on a small area first to ensure it won't harm the plants.