Have you looked up at your live oak leaves recently? Cottonwood trees are huge deciduous trees that have large green leaves and thick foliage. What could they be? They tear apart much like a cigarette filter and are filled with hard seeds. This is the first time I have seen these here in 35 years. Oak trees can produce galls — fuzzy red growths that look like cotton balls — when they’re invaded by fungi, insects or mites. If they are galls can you give me a little more information such as what insect, how long do the take to mature? Several others are on the ground, blown down by wind. Is the gall specific to a tree species or to an insect? Hi, I have an oak tree that has fuzzy growths on the leaves. Like Like. They look like cotton. Oak galls come in many sizes, shapes and colors but are all products of the oak trees' reaction to the larvae of certain wasps known as gall wasps. Two weeks earlier had come a question from East Bethel in Anoka County: “I have an oak tree that has fuzzy growths on the leaves. I see these fuzzy balls dropping from my neighbor’s oak tree this year; some are also still attached to dropped leaves. It is a fluffy mass of around 20-30 mm in diameter which, as the name suggests, resembles a ball of cotton-wool in appearance and texture. The oak tree looks perfectly healthy, and has been dropping a few occasional balls for 2 years. Q.I have fuzzy light brown cotton balls on the underside of the leaves on my oak tree. I live in central MD, by the way. More noticeable when the wind blows. From a distance, a woolly aphid colony can appear to be a fuzz or moldy growth on a tree branch. They appear to have been opened by either birds or squirrels that were looking for food. Reply. These larvae cause the oak tree to manufacture cells and substances that produce the gall and in turn the wasp larvae use the gall as both food and shelter. Galls are irregular plant growths which are stimulated by the reaction between plant hormones and powerful growth regulating chemicals produced by some insects or mites. Peter L. Warren Facebook Upon closer examination, I see they appear to be cotton balls. They aren't oak galls, because I looked it up on the internet. This thread reminded me to look it up. Looking at a woolly aphid colony from above, you see tiny black dots amongst the fuzzy, white, cottony substance. I thought they were galls but I just see a little seed like thing inside. They look like cotton. Uh oh! One of the common features of all types of cottonwood trees is the fluffy cotton-like strands that appear every June. Cottonwood trees are common in North America, Europe, and some parts of Asia. Just as an oak tree's buds break open in February or March, an adult wasp would alight on a juicy, fast-growing leaf to lay eggs. What's That Fuzzy Stuff on My Tree? These are leaf galls. Internet says : " The highly distinctive cotton-wool gall develops on the male catkins of oak trees. If not, you might be surprised to see clusters of fuzzy yellow-beige balls on the underside of some of those leaves. Every year about this time I receive a number of calls from homeowners who have oak trees about a fuzzy ball growing on the leaf of their trees. They look like cotton. Shawn says: September 27, 2015 at 5:09 pm. Saw these on my deck this morning, below an oak tree.
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