In this Palo Alto article, George Reno from Davey's Menlo Park office shares which leaf-eating pests to look out for. 

Posted: May 19, 2025

Leaf-feeding insects are a part of life in the Peninsula’s rich horticultural landscape. The region’s mild Mediterranean climate and diverse variety of native and ornamental trees create an ideal environment for many beneficial insects to thrive, but the landscape also is ideal for destructive leaf-feeding pests, as well. Common culprits in this area include aphids, oak moth caterpillars, oak silkworms and thrips. 

Green leaves stemming from a tree branch in the sunlight.

While occasional feeding is normal, heavy infestations can harm tree health and aesthetics. These pests can weaken trees, reduce vigor and leave unsightly damage if not properly managed. 

Regular tree inspections, proactive care, natural predators and targeted treatments are the best strategies for keeping these pests in check. 

Here are some tips on how to combat some of these destructive pests commonly found in the region.

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For more information, contact the Menlo Park Davey office

The Davey Tree Expert Company provides research-driven tree services, grounds maintenance and environmental and utility infrastructure consulting for residential, utility, commercial and environmental partners in the U.S. and Canada. Established in 1880 and headquartered in Kent, Ohio, Davey has over 12,000 employees who create and deliver sustainable solutions. Davey continues to grow through expertise with the SEED Campus, its newest commitment to training, research and safety. Become part of the Davey legacy by applying today and join one of the top ten largest employee-owned companies in the U.S.

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