340 Pflanzenkrankheiten. 



the dilch banks, the natural habitat of Distichiis. The salt grass turf 

 may be burnt in the fall or winter; it is probable that the fungus 

 is entirely killed by this method. When the turf of the salt grass 

 was plowed under, its subsequent development was hindered greatly. 



M. J. Sirks (Haarlem). 



Potter, A. A., Head smut of sorghum and maize. (Journ. 

 Agr. Res. IL p. 339-372. pl. 31—37. 7 textflg. Aug. 15, 1914.) 



Sorosporiuni Reilianum is held not to be carried by the host- 

 seed, but is wind-distributed in the locality in which it occurs, 

 doubtless infecting the seedling from the soil. Trelease. 



Rand. F. V., Some diseases of pecans. ([ourn. Agr. Res. I. 

 p. 303—338. pl. 33 -37. 8 textfig. Jan. 10, 1914.^ 



Discussion of the attacks of Phyllosticia Caryae, Cercospora fusca, 

 Gloinerella cingulata, and a new species, Coniothyrium caryogenuni. 



Trelease. 



Reed, G. M., An unusual outbreak of apple blossom 

 blight. (Phytopathology. IV. p. 27—30. 1914.) 



From the three forms, under which the disease, caused by 

 Bacillus mnylovorus (Burrill) de Toni appears, is blight canker quite 

 common in Missouri on the trunk and larger limbs of the pear. but 

 not common on the apple, twig blight is ver}'' common and destruc- 

 tive on the pear and on some varieties of apples, while blossom 

 blight has been reported as injurious to the pear and quince, but 

 not common on apple. In the season 1913 the disease atlracted 

 special attention as a blossom blight. A somewhat careful study of 

 this blossom blight was made by the writer. In regard to the supposed 

 immunit}'^ of some varieties against this disease, the writer found 

 by counting the number of blighted and healthy Clusters of blossoms 

 on a number of limbs, as very susceptible the varieties Ingram 

 (990/0 blighted), Melonen (91o/o blighted), Jeneton (90^Vo)' Devonshire 

 Duke (88'J/o), Stayman Winesap (84%) and others; perfectly immune 

 seemed to be Ben Davis, Ontario, Early Harvest and Gano. In 

 cases of very bad infection the effect of the disease was very striking. 

 Practically all of the flower Clusters had blighted and the disease 

 had spread back to the few leaves near the base of each flowering 

 shoot. In the same orchard blossom blight was also very common 

 on the pear, while twig blight was also conspicuous. A large percen- 

 tage oS. blighted flower Clusters was also found on wild crabs and 

 haws, particularly on Crataegus Crus-galli. The sudden appearance 

 of blossom blight in such a grade, can be explained by the excep- 

 tionally mild winter 1912 — 1913 in Missouri, where the lowest tem- 

 perature recorded during the winter at the Columbia Weather 

 Bureau Station was 1° above zero, or it can be explained by the 

 fact, that spring 1913 was unusually late, the apple trees Coming 

 into bloom perhaps two weeks later than usual. Bees were much 

 more common at this late blooming period and may have caused 

 by their increased number a very wide spreading of the bacteria 

 and the disease through the orchard. M. J. Sirks 1 Haarlem). 



I 



