Defoilators on Garry oak (Quercus garryana)- aging a garry oak without boring it.
Can you please help me identify the defoliators on this oak. I have attached a few pics of insects I found on the leaves. One is an aphid like insect. The tips of the leaves are rolled, where a worm is hiding underneath. Please refer to pics. Not sure whether both of the insects are related or attribute to the defoliation. Are these insects considered a problem?
Another question. Is there a way of ageing a Garry oak without boring it. I have heard that every cm of diameter is equal to 2-3 years. Therefore a tree 60 cm DBH tree would be 120-180 years. Fact or fiction or reasonable?
Terrific. Thank you so much for you help.