556 EXPERIMENT STATION RECORD. 



In doing this plats were given varying numbers of sj^rayings, ranging 

 from 1 to 4, to test the number and time of applications necessary. 

 The earliest treatments gave tbe poorest results. Two s}3rayings, on 

 May 1 and 15, or May 1 and June 1, gave results that indicate 2 spray- 

 ings are sufficient treatment. Additional applications gave only slight 

 imi)rovement over those receiving but L* sprayings. It is recommended 

 that the first spraying should be delayed until late in the sirring, so as 

 to have the leaves well covered at the time of the first attack of the 

 fungus, and the second application should be given just before the prin- 

 cipal attack and late enough to last throughout the season. The method 

 of treatment of the orchard as a wliole is given in detail. The cost of 

 spraying the orchard 4 times was $522 for the 16,000 trees, or about 

 $2.50 per acre. As it is shown that 2 apidications are sufficient, the 

 cost may be reduced one-half. 



Experiments with fungicides to prevent leaf hlujlit of nursery stocTc, 

 J). G. Faircliild (pp. 338-353).— A report is given of the details of experi- 

 ments carried on at Geneva, New York, in cooperation with S. A. Beach, 

 of the New York State Exiieriment Station, who has already rei)orted in 

 part upon this work.^ The experiments here reported on were conducted 

 with pear seedlings. In all, 25 mixtures of fungicides were used, the 

 formulas and reactions of which are given. Of these mixtures the only 

 ones that did not injure the foliage and retarded to some degree the 

 progress of the disease were copper acetate, cojiper borate, copper car- 

 bonate, copper ferrocyanid, copper hydrate, copper phosphate, co])per 

 silicate, and eau celeste with soap. The author is of the opinion that 

 had Bordeaux mixture been tried it would have proved superior to any 

 of those used. Notes are also given on the treatment of horse-chest- 

 nut leaf blight {PhyJlosticta spluvropsoidea). The x)i"tdiminary experi- 

 ment warranted the recommendation of Bordeaux mixture as a 

 preventive of this disease. 



Prune rust, JV. B. Pierce (pp. 354-363). — Notes are given on the dis- 

 tribution and action of prune rust {Puccinia pruni) on the stocks. It 

 is reported as affecting the prune, plum, peach, nectarine, apricot, 

 cherry, and almond. Experiments were conducted in one orchard with 

 modified eau celeste, while in another modified eau celeste and ammo- 

 niacal copper carbonate were used. A striking contrast was noted at 

 the end of the season in com])aring the si)rayed with the check trees, 

 proving the eflicacy of the treatment. All things considered, ammo- 

 niacal copper carbonate is preferred to the eau celeste. The number 

 of applications necessary can not be definitely stated, but 2, if thor- 

 ougldy applied, will usually suffice. The cost will be about 3 cts. per 

 tree for each application. 



Preliminary notice of a fungns parasite on Aleyrodes citri, H. J. Webber 

 (pp. 363, 364). — The author reports finding a fungus attacking Aleyrodes 

 citri and it has been i)rovisonally determined as Aschersonia tahitensis. 

 ~ 'N. Y. State Sta. Bui. 72; E. S. E.,6, p. 302. 



