834 WEED FLORA OP IOWA 



ported on an examination of several hundred samples of seed with 

 special reference to the occurrence of dodder, Russian thistle, and 

 Centaurea rep&ns; an earlier report by the same author reported 

 on seed tests made at the station. Further discussion is found in 

 the New York Agricultural Experiment Station Circular 8 :l-4, 

 Dodder in Alfalfa, by F. C. Stewart and G. T. French. Mr. M. 

 T. Munn in Bulletin 362 gives the seed tests made in 1912, giving 

 results of examinations made for purity of commercial samples. 



North Dakota. — ^H. L. BoUey discussed the pure seed law of 

 North Dakota and seed work ending December 31, 1909, with an 

 account of weed seeds found. 



Wisconsin. — A. L. Stone in a circular of information discussed 

 the seed inspection law of the state, adding some general informa- 

 tion. "With G. T. Moore he also discussed the question of the eradi- 

 cation of farm weeds which have been introduced by means of im- 

 pure seed. 



Mr. George T. Harrington discussed the worst weeds in connec- 

 tion with grass and clover seeds. D. L. Beach made a study of 

 commercial feeds with reference to the germination of weed seeds 

 found in these feeds. Feed subjected to steaming before feeding 

 contained no germinable weed seeds. 



Texas. — ^According to 0. M. Ball alfalfa seed sold in. Texas con- 

 tains the following chief impurities: Russian thistle, ribgrass, 

 tumbleweed, pigweed, two kinds of dodder, green foxtail, curled 

 dock, bur clover, and sweet clover. The vitality varied from 49.5 

 to 96.5 per cent. A subsequent report also on alfalfa seed was 

 made. 



Arizona. — Prof. Thomber made an examination of alfalfa seed 

 sold in Arizona. This showed a high percentage of germination. 



Iowa. — The Iowa Agricultural Experiment Station has produced 

 several publications relating to weed seeds. Ball discussed im- 

 purities in grass seed; Pammel, Buchanan and King have pub- 

 lished a bulletin eoveoring impurities of commercial seed. Two 

 bulletins by L. IT. Pammel and Charlotte M. King, "Results 

 of seed investigations for 1907" and "Results of seed investiga- 

 tions for 1908 and 1909," give the results of analyses of seed sent 

 by farmers to the Station. The results of the 1907 investigation 

 indicated that the weed seeds were different in many cases from 

 those reported in a previous publication; dropseed grass was 

 common, occurring in 3.3 per cent of the samples; Canada thistle 

 seed was also less frequent. The investigations for 1908-1909 in- 



