It's that time of the year! Jumping oak galls may be found under the canopy of our mighty valley oaks. When Cynipid wasps sting the the underside of the leaves, the oak forms a gall that holds an egg. When the galls fall to the ground, the jumping movement of the developing wasps helps move the gall further into the soil and leaf litter for overwintering. While there may be leaf scorching from this interaction, most trees remain healthy. Enjoy observing these seasonal wonders! #ucdavisoaks #ucda
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It's that time of the year! Jumping oak galls may be found under the …
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Have you ever seen these strange leafy growths on oak trees? They show up often in spring and many people mistake them for flowers. They’re actually leafy oak galls, one of the hundreds of unique galls created by tiny gall wasps in the family Cynipidae. When the female wasp lays an egg, the plant responds by forming this protective structure around the developing larva. Inside the gall, the larva feeds, grows, and eventually emerges as an adult wasp. Watch as we cut open one of these galls to re
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