what is a oak gall - Gardening Tips
An oak apple or oak gall is a large, round, vaguely apple-like gall commonly found on many species of oak. Oak apples range in size from 2 to 4 centimetres (1 to 2 in) in diameter and are caused by chemicals injected by the larva of certain kinds of gall wasp in the family Cynipidae. What are Oak Galls?
Understanding the Context
Oak galls are abnormal plant growths found on foliage and twigs that are produced by small oak gall wasps. Shapes of galls vary from spherical to urn-shaped to star-shaped to fuzzy. Inside the galls are the eggs and larvae of the insects. In this post, I’ll explain oak galls, how they form, and how they can be used for everything from natural dyes to historical ink.
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Key Insights
What Are Oak Galls? Oak galls are knobbly, sometimes marble-like growths on oak trees when tiny gall wasps lay their eggs in the tree’s tissues. Twig and stem galls, such as the gouty oak gall and horned oak gall, are solid, woody masses that can girdle branches or make them droop from the sheer weight of the heavy growths. The galls can grow to more than 2 inches in diameter. Galls are abnormal growths created by the oak tree in response to tiny insects such as wasps, months, aphids, etc.
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These critters lay eggs or feed on the tree, triggering the plant to form a protective (and sometimes quite bizarre-looking!) structure around them. Oak galls primarily result from small insects, most notably gall wasps (Cynipidae) and sometimes midges. These insects initiate gall formation by laying eggs into specific oak tree tissues, such as leaves, twigs, buds, or roots. Oak apple galls are conspicuous, abnormal growths that occur on the leaves of oak trees (Quercus spp.). As their name suggests, these spherical, green galls resemble apples. The galls are induced by several species of wasps that utilize nutrients from the growth for larval development.
Demystify oak galls. Learn what these unique tree growths are, how they originate, and their actual impact on tree health. What Is an Oak Gall & Are They Harmful to Trees? - Biology ...