Species Responsible
There are two species mainly responsible for defoliation and browning of birch trees in the United States and Canada. In Northern forests, it is the Amber Marked Leafminer, Profenusa thomsoni, which were accidentally introduced from Europe to North America early in this century. The other is the Birch Leafminer, Fenusa pusilla, which is more common in Eastern forests.
Read more about this topic: Birch Leafminer
Famous quotes containing the words species and/or responsible:
“Not only does every animal live at the expense of some other animal or plant, but the very plants are at war.... The individuals of a species are like the crew of a foundered ship, and none but good swimmers have a chance of reaching the land.”
—Thomas Henry Huxley (1825–95)
“... women of the North, I ask you to rise up with earnest, honest purpose, and go forward in the way of right, fearlessly, as independent human beings, responsible to God alone for the discharge of every duty, for the faithful use of every gift, the good Father has given you. Forget conventionalisms; forget what the world will say, whether you are in your place or out of your place; think your best thoughts, speak your best words, do your best works, looking to your own conscience for approval.”
—Susan B. Anthony (1820–1906)