DISEASES OF PLANTS. 171 



and healthy cahbage plants inoculated with these germs ehowed the presence of black 

 rot in from 1 to .'! weeks. 



It was also shown that seed produced by cabbage plants infected with Mark rot are 

 able to carry the organism and infect seedling plants. The details of tins investiga- 

 tion arc to be published in a forthcoming bulletin of the New York State Station. 



Peach diseases, III, A. I). Selby (Ohio Sla. Bui. 148, pp. 55-67, />/■■<■ 7).— This 

 bulletin gives notes on the prevalence, surrounding conditions, and methods 

 employed i'or the prevention of leaf curl and scab of the peach during recent years 

 in Ohio, and is in continuation of notes previously given (E. S. Ii., 10, p. 557; 11, 

 p. 357). 



The occurrence and distribution of the leaf curl in northern Ohio for the past 11 

 years is traced, and an attempt made to correlate the occurrence of the disease with 

 weather conditions. It is stated that the leaf curl was prevalent during seasons of 

 Erequent rainy days in April, May, and June. When these months were warm and 

 fairly bright the amount of leaf curl was greatly reduced. Spraying the trees with a 

 single application of Bordeaux mixture before the opening of the blossoms proved 

 effective for the prevention of leaf curl, and where fungus diseases only are to be 

 combated Bordeaux mixture is to be preferred. Where it is desired to treat the 

 trees simultaneously for leaf curl and scale insects some of the sulphur sprays are 

 recommended. 



The results of 7 year.-' study of the prevalence and injury of the fruit spot or scab 

 fungus confirm the popular opinion that this fungus is influenced in its development 

 by the amount of rainy weather in the late summer and early fall. The severe los-es 

 that frequently follow the presence of this fungus may be largely prevented by the 

 proper use of fungicides, and in addition to 1 spraying before the blooming period 

 tee in observations indicate that 2 applications of weak Bordeaux mixture, one about 

 June 1"> and the second .'! or 4 weeks later, will largely or entirely prevent the occur- 

 rence of scab. 



Crown gall, J. B. S. Norton- (Maryland Sta. Oirc. J!"!. 56, 2. "/., pp. 8, ph. G). — 

 The attention of growers is called to some of the principal characteristics of the crown 

 gall and hairy root, which are considered by some to be forms of the same disease. 

 According to the author, the nurseries of the State, which are subject to regular 

 inspection, are practically free from crown gall, and nurserymen are especially careful 

 to discard infected stock when shipping. Care in the selection of stock and the use 

 of resistant strains where known are recommended as preventive measures. 



A note on the collar rot of the orange, R. A. Davis (Transvaal Agr. Jour., ; 

 (1904 I, No. 6, pp. 133, 134, pi. 1)- — The author shows that the collar rot of the orange 

 has been present in the Transvaal for a considerable time, in spite of the frequent 

 assertion that the disease does not exist in that region. 



The usual method of irrigating the orange, which consists of the formation and tilling 

 of a basin around the trunk of the tree, is held to be partially responsible for the pres- 

 < if the disease. Fully nine-tenths of the orange trees are said to be suffering from 

 the application of water around the trunks. This with the improper drainage fre- 

 quently leads to disease. Where the trees have become badly infested the author 

 recommends total destruction, but where only slightly affected it is recommended 

 that the bark be cut away from about the spots, leaving the wood exposed for several 

 days. If no exudation of gum be observed it maybe considered that the disease has 

 been removed and the wounds should be protected by a coating of some fungicide. 

 S.i far as practicable the use of resistant stock for grafting and budding is suggested. 



The sooty mold of the olive, Zacharewicz (Bui. Dir. Agr. et Com. [Tunis], 'J 

 (1904), No. SI, pp. 208-211). — The sooty mold of the olive, according to the author, 

 is due to the fungus Fumago salicina, which develops over various portions of the 

 tree as a black coating, from whence it gets its name. It follows the Lecaniurn 



8405— IS 1 ) . 2—04 5 



