In Northern New York, acorns ripen in late summer and normally drop from oak trees from September through October. They may fall earlier, however, for a host of reasons, from eager squirrels getting a head start on gathering nuts for the winter to environmental stress, including excessively hot or rainy weather.
Prematurely dropped acorns are green, whereas ripe acorns are brown. Other reasons acorns may drop early include poor pollination and tree infestation by insects or diseases. The most peculiar cause of premature acorn drop that I have encountered is the acorn pip gall wasp. [Read more…] about The Peculiar Acorn Pip Gall Wasp
The elm zigzag sawfly (Aproceros leucopoda) is an insect that only eats elm leaves and can cause severe defoliation (leaf loss) that threatens tree health. 
The eastern white pine (
