246 EXPEEIMENT STATION EECOED. 



A bibliography of the more important literature relating to the diseases of the 

 sweet potato eomi)letes tlie bulletin. 



A new bacterial disease of the pods of some leguminous plants, E. von 

 Oven (Centbl. Bait, [efc], 2. AM., 16 (1006). Xo. 1-3, pp. 67-7-J, pi. 1).—A 

 description is given of a bacterial disease of peas and other leguminous plants 

 that was investigated by the author in 19(»5. The disease was first noticed 

 in the vicinity of Berlin and proved very desti-uctive. Its cause is said to be 

 Bacillus leguminiperdiis n. sp., which attacks the fruiting pods of peas, beans, 

 wax beans, lupines, etc., and possibly will be able to destroy the fruits of other 

 plants, particularly those of tomatoes. The diseased pods appear to be smaller 

 and ripen earlier, the ripened fruits being darker and quite unlike the normal 

 ones. The organism was isolated and cultivated in pure cultures, and inocula- 

 tion experiments showed the possibility of transfering it to all available 

 legumes, tomatoes, etc. The organism is said to be very unlike that of 

 Bacillus phaseoli, previously recognized as causing disease of beans, etc. (E. 

 S. R., 9, p. 1058.) 



Apple scab in eastern Washington, W. H. Lawrence {'Washington Hta. Bui. 

 7J, pp. 14). — In a previous publication (E. S. R., IG, p. 573) the author gave the 

 results of a study of the life history of the fungus causing apple scab in 

 western Washington, and also some experimental work in combating it. In 

 the present Inilletin an account is given of additional work recently carried 

 on in the eastern part of the State, where the climatic conditions are quite 

 different from those reported in the previous publication. 



The general development of the fun.gus in the eastern part of the State was 

 noted, but no additional facts were found regarding its life history. The rapid 

 increase in tlie amount of disease is shown in a table, giving the percentage 

 of the disease on 12 varieties during the past season, \^'hich shows an average 

 increase of 52 per cent in scabby fruit. 



Experiments were carried on for the prevention of the disease in which trees 

 were sprayed with ordinary Bordeaux mixture and also dust Bordeaux. On 

 85 trees representing 15 varieties sprayed with dust Bordeaux, the average 

 percentage of clean fruit was 13 per cent, while on 50 trees representing the 

 same numlier of varieties that were not sprayed the average percentage of 

 clean fruit was G per cent. On the other hand, GO trees representing 8 varieties 

 that were sprayed with liquid Bordeaux gave an average of 89 per cent clean 

 fruit, showing the evident superiority of the liquid Bordeaux for the prevention 

 of this disease. 



Notes are given on the r»reparation and aiiplication of the fungicides. 



The black rot of apples due to Sclerotinia fructigena, F. D. Heald (Ne- 

 hraska titu. lipt. lOOo, pp. 82-91, pis. 2). — Attention is called to the fact that the 

 rotting of fruits by Sclerotinia fructigena has generally been characterized as the 

 brown rot, and that some symptoms attending this rot have hitherto escaped 

 American and English investigators. 



The form here described is that known as black rot, which has been noted by 

 several German in\estigators, and is attributed to attacks of Monilia. As the 

 black rot due to Monilia and that caused by Sphwropsis malorum have been 

 confused, attention is called to some of the external differences. In apples 

 affected by the Monilia the skin is shiny, coal black, smooth, and perfectly free 

 from external evidence of fungus mycelium or fruiting bodies, while in the case 

 of fruits attacked by Sphjeropsis the surface of the apple is sometimes brown and 

 soon becomes dotted with black pustules containing the pycnidia of the fungus. 

 Ihe areas between the pustules are darkened, giving the whole surface a dark 

 In-own or black color. In Monilia-affected apples the fruit does not shrivel 



