“Attacking the Solidago or Golden Rod.” “Quite common in eastern New York.” “Slender, straigh, smooth stalks of the Golden Rod quite often have one and sometimes two large, round galls or ball-like swellings upon them, an inch in diameter, when the stalk above and below is less than a quarter of an inch.” “In the winter season most of them are found to be empty, with a round hole perforated in them, the worm having completed its growth, and the winged fly having come out through this perforation the preceding autumn.