Throughout the summer you can find a variety of galls – the wool sower gall, the oak apple gall, the scrub oak gall and many others. Many galls, like the ones listed here, are found on oaks, which are common host plants for many gall-producing insects. But a few weeks ago, I noticed a gall on staghorn sumac (Rhus typhina) for the first time. If I hadn’t been inspecting the undersides of the leaves closely, in search of a butterfly…
Although I’m sure many of you are waiting as eagerly for the first flower buds, returning migrant birds, and other signs of spring as I am, I do still appreciate some of the nature observations that are just plain easier in the winter. Galls are certainly one of them. With no leaves on trees and shrubs, any galls remaining on woody stems are easily visible. Galls come in a variety of unique shapes and sizes; I’ve written about a number…
I hope you had an opportunity to get out and enjoy the mild temperatures we had this weekend. During my typical winter walks, I tend to walk rather quickly in an effort to build up some heat and keep warm. But this weekend’s weather afforded me the opportunity to slow down (without fear of freezing) and explore the tiny winter world of lichens, mosses and galls. One abandoned fence post I came across seemed to have an entire miniature world…
Galls are formed when a plant is stimulated to develop irregular growths, caused by growth regulating chemicals produced by some insects or mites, or in some cases a fungus. Examples of galls include cedar apple rust and oak apple gall. These growths can occur on any part of the plant, including the leaves, bark, flowers, buds, acorns, or roots, however leaf and twig galls are often the most noticeable. In the case of an insect induced gall, the irregular growth…
This time of year, with the leaves still absent, it’s hard not to notice the tan spheres attached to the ends of some oak branches. These ball-like objects are oak apple galls, and can range in size from 1 to 2 inches in diameter (approximately golf ball sized). A “gall” is a general term for a plant deformity caused by an insect or a fungus. These oak apple galls are caused by gall wasps in the family Cynipidae. Female wasps…