Galls on oak leaves are harmless growths caused by specific insects. They have different shapes depending on the insect species causing the gall.

Those are insect galls that result when the female insect ... Can I raise them from the spores I see forming on their leaves? Assuredly you could. That is, after all, the way nature does it ...

Some of the most common galls form on oak trees. Of the 2,000 insect species that stimulate gall formation, at least 800 of them use oaks as their host. The photo I received (and is pictured here ...

What I was seeing here was a type of insect gall. Indeed, this is known as a ... The hatched larva bites into the bud and the plant responds by forming this cone-like structure.

Reach him via Katie Rohman at krohman@duluthnews.com. A pine cone gall as seen on a willow tree in winter. Note the scales, like a pine cone. The tiny insect, a midge, that made this gall is inside.

The galls expanded, and in this case, changed color to make room for all the creepy crawlies. “The gall-forming insects are really interesting because they have a symbiotic relationship with the plant ...

Answer. You have spotted the handy work of quite small insects or mites. Oaks, especially the live oaks, seem to be susceptible to a number of gall-forming insects that produce swollen tree ...

systemic insecticides that are transported inside the plant are not very effective in killing the gall-forming insects while they are feeding. Also, since the gall tissue is different from the ...

What causes them – insect, fungus? How should I treat ... Affected trees ordinarily show little injury and once the gall begins to form the process cannot be stopped. Treatment is not ...

A student plopped a leaf on my desk, pointed to several green lumps on its underside, and asked, “What are those green growths?” It was a stump-the-professor moment and in this case, I was, indeed, ...