Trees that are in known areas of infestation can be treated preventatively in the early spring with TREE-äge at least 4-6 weeks prior to activity. Look for signs of leaf feeding or fecal pellets around the base of the tree for activity or worms raining down on you. Oaks that are experiencing other stresses, such as drought, can decline from oak worm infestation at a quicker rate. Many leaves appear partially chewed (skeletonized) and will turn brown and die, while other leaves may be completely eaten. Damage may appear sporadically or throughout the entire canopy. Healthy oaks affected by Oak Worm experience defoliation in the Spring and throughout the Summer from one or more of these pests. Tussock moth is common in San Francisco but can also be found along the Central Coast. In California, Oak Worm is most commonly found on coastal live oak in San Francisco, Monterey Bay, Santa Barbara, and other areas close to water sources. Tussock moth larvae are very distinctly hairy with three prominent creamcolored dots towards the head capsule. They can range from 1/10 to 1 inch in length throughout their development.

Oak worms are smooth, small, yellow-green caterpillars with brown heads and dark stripes down their sides. There are several caterpillars that feed on oaks including the California oak worm and tussock moth.Įach of these caterpillars feed on oak leaves.

Spongy Moth, formerly known as “Gypsy Moth”.

Download black willy worms