578 EXPERIMENT STATION RECORD. 



year's work. The iirinci])al investigations were for the presence of dodder seed, and 

 purity and fjerniination tests. Red, white, and alsike clover, serradella, alfalfa, and 

 various species of grass seed formed the bulk of all the seed investigated. The inves- 

 tigations for dodder showed the presence of varying quantities of seed of that parasite 

 in about 38 per (;ent of all the specimens examined. A detailed report is given show- 

 ing the maxininin, minimum, and average purity and germinative ability of the dif- 

 ferent kinds of seed tested, and also the variation from the percentages obtained the 

 previous year. Some of the special seeds investigated are discussed in detail. 



Report of the seed control station at Hernosand, C. G. Strokihk {Bfr. Verks. 

 Frokontrolldnsl. Hernosand, 1901, ]ip. 15).— X report is given showing the maximum, 

 minimum, and average vitality, i>urity, and intrinsic worth of 684 samples of seed 

 tested between July, 1900, and June 30, 1901. The principal seeds were those of 

 cereals, grass and forage plants. 



Report of the peed control station at Lulea, 1900-1901, P. Hellstrom {Ber. 

 Verks. Knn. VaxUriol. And. Frokoidrollanst. lAiled, 1901, pp. 33-38). — A report is 

 given on 234 analyses of seeds and upon the certification of 355 kilos of timothy seed. 

 The results of the different analyses are shown in tabular form, the maximum, mini- 

 mum, and average purity and germination being given. A report is also given of the 

 weed seeds which were found most al)undant in seed of rye, wheat, oats, timothy, 

 and vetch. 



Report of the seed control station at Molkom, 1901, J. A. Andersson [Red. 

 Venn. Frukoiitrulldu.st. ocli Kein. Lab. Molkom, 1901, jjp. 1-20). — Detailed reports are 

 given of tests made on 43(5 lots of seed which were tested during the year. In addi- 

 tion to the usual report of ])urity and germinations of the several samples, tables are 

 given showing the average jmrity, vitality, etc., for all seed tests made since 1893 to 

 the date of the report. The principal weed seeds and the relative amounts which 

 were found present in grass and forage ])hint seed are shown, as well as the results of 

 tests on the relative value of seeil obtained from different countries, effed oi treating 

 seed for snnit prevention, etc. 



A study of dodders, B. D. Halsted {New Jersey Stas. Rpt. 1901, pp. 451-457, pis. 

 2). — During the winter a study was made of a number of species of dodder, the seed 

 of which were collected from clover, flax, and other seed. The germination of the 

 dcdder was determined and its subsequent growth ascertained. Compiled notes are 

 given regarding different species of dodder and the plants which they attack. 



Experiments with weeds, B. I). H.alsted {New Jersey Stas. Rpt. 1901, p. 420). — 

 In (•oiitimiati(jii of the experiments previously reported (E. S. R., 13, p. 756) the 

 present status of the weed plat is described. At the present time brome grass, field 

 bindweed, and yellow daisy have become very aggressive, while some reported 

 previously have drojiped from the head of the list and others have almost totally 

 disai)peared. A number of new weeds have appeared, and there seems to be a tend- 

 ency for the ground to be covered with a growth of low plants such as clovers, 

 grasses, and Inndweeds, above which is a cover of tall growing plants such as sweet 

 clover, yellow daisy, smartweed, and velvet leaf. 



DISEASES OF PLANTS. 



Report of the botanist, B. D. Halsted {Nem Jersey Stas. Rpt. 1901, pp. 3S5-459, 

 ph. /.;,_//// i). — During the period covered by this report less attention has been 

 given to the su))ject ot i)lant diseases and their control than in previous years and 

 more to the l)reeding of various varieties of plants. These are noted elsewhere. Obser- 

 vations have been continued on the asparagus rust and the usual work reported on 

 weed investigations. Some studies were made on various species of dodder and these 

 are reported at some length. The experiments with turnijis, which have been carried 

 on for 7 years, have been terminated, as it is fullv demonstrated that lime is a satis- 



