344 EXPERIMENT STATION EECORD. 



:i root disease of the pomelo. It lias also been found on the coconut, but prob- 

 ably it is only saprophytic on this host. It is said that this species does not 

 often form fruiting bodies on the tea plant, since the bushes die and are usually 

 uprooted before the mycelium has ascended in the stem to the ground level. 



Physiolog'ical diseases of the vine, F. T. Bioletti {Pacific Rural Press, 

 78 (1009). Xo. 7, p. 5). — Popular descriptions are given, with suggestions for 

 prevention so far as means are known, of a number of physiological diseases 

 of the vine. The forms most generally recognized are said to be folletage and 

 apoplexy, rougeot and red leaf, brunissure, the Anaheim disease, and sunburn. 



The coulure of the vine, F. T. Bioletti (Pacific Rural Press, 77 (1909), 

 Xo. 22, p. J/Ol). — The author describes the coulure of grapes, two conspicuous 

 forms of which are noted. The iirst is characterized by the failure of the 

 flowers to set, or by the berries dropping off without growing, while the second 

 is indicated by the falling of the berries after they are well formed. To the 

 first the name early coulure is given, while the second form is called late 

 coulure, or, as it is commonly known in the United States, shelling. 



A number of causes of this disease are described, among them the presence 

 of imperfect flowers, excessive vigor, which results in a tendency to the pro- 

 duction of abnormal flowers, and unfavorable weather. The variety of grapes 

 known as Muscat seems to be pretlisposed to this trouble, and the cause lies in 

 the structure of the flower, which is said to lead to imperfect pollination. 



The black rot of the grape and its control. Second report, C. S. Wilson 

 and D. Reddick (Xgw York Cornell Sta.BMl.266,pp. 391-411, figs. 12). — In con- 

 tinuation of the previous report (E. S. R., 20, p. 249), the authors give an ac- 

 count of spraying experiments for the control of the black rot of the grape 

 (Guignardia hidiveUii). The correlation between rainfall during the growing 

 season and the abundance of black rot has been pointed out in France, and the 

 authors have verified these relationships when applied to New York conditions. 



The previous investigations on methods of control are briefly reviewed which 

 indicated that a moderate degree of spraying will control the black rot, that iron 

 sulphate as a fungicide is of little value, that the addition of a sticker, such as 

 resin, flsh oil soap, etc., is of no practical value, that burning the tendrils on 

 the trellis is a means of destroying some of the winter spores, and that the times 

 of application of the fungicide bear an important relationship to the control of 

 the disease. 



In 1908 experiments were carried on to demonstrate on a commercial scale 

 that black rot can be controlled and also to determine the minimum strength 

 of mixture, the value of cultivation in the control of the disease, and the best 

 time to apply the mixture in relation to the blooming period and the weather 

 conditions. 



The results of the experiments give evidence that the rot can be controlled 

 commercially by thorough spraying with mixtures properly made and applied, 

 although it has not been demonstrated that spraying will control the rot in 

 exceptionally wet seasons. 



For the control of the black rot the authors recommend the plowing of the 

 vineyard to cover all the rotten clusters and leaves, keeping down the weeds 

 and grass, the destruction of mummied fruits, keeping the vines off the ground, 

 and thorough spraying, the spray to be applied at a pressure of at least 100 

 pounds. The applications will depend on the weather, and contrary to the 

 common belief, it is recommended that the spray be applied before rather than 

 after a rain. In general the first spraying should be with a 5 :5 :50 Bordeaux 

 mixture at the time when the second or third leaf is showing, followed by a 

 second application just before the blossoms open, and a third soon after they 



