1911.] PUBLIC DOCUMENT — No. 31. 165 



rot." Thin the fruits so tbat they do not at least come in con- 

 lact with one another. By using the above precautions and 

 applying the following s])ray mixtures for "' brown rot," '' scab " 

 and '' plum curculio '' 1 believe that the fungus can be almost 

 entirely controlled. For the Elberta, Belle, Reeves, and other 

 varieties of peaches of about the same ripening season, the fol- 

 lowing is advised: (1) about the time the calyces of shucks are 

 shedding, spray w'ith arsenate of lead at the rate of 2 jwunds 

 to 50 gallons of water. In order to reduce the caustic proper- 

 ties of the poison, add milk of lime made from slaking 2 pounds 

 of stone lime. The date of this treatment is too early for scab, 

 and ordinarily no serious outbreaks of brown rot occur so early, 

 so that the lime sulphur may be omitted with reasonable safety ; 

 but during warm, rainy springs, especially in the south, the 

 lime sulphur will doubtless be necessary in this application. 

 (2) Two or three weeks later, or about one month after the 

 petals drop, spra}^ with self-boiled lime sulphur; 8 pounds of 

 lime, 8 pounds of sulphur and 2 pounds of arsenate of lead to 

 each 50 gallons of water. (3) About a month before the fruit 

 ripens, spray with the self-boiled lime sulphur, omitting the 

 poison. 



For earlier maturing varieties, such as Waddell, Carmen and 

 Hiley, the first two treatments outlined above would probably 

 be sufficient ordinarily, but in very wet seasons varieties sus- 

 ceptible to rot would doubtless require three treatments. Late 

 varieties, such as Smock and Salway, having a longer season, 

 ^\'ould not be thoroughly protected by three applications. In 

 view of the results obtained on midseason varieties it seems 

 likely that three ti-eatments will ordinarily be sufficient for the 

 late varieties. 



Black Spot or Scab (Cladosporium carpophylhim, Thiim.). 

 History and Disfrihufioi). — This fungus was first noticed in 

 1876 by Von Thiimen of Austria, who was at that time botanist 

 to the Austrian Experiment Station. In the year following, 

 1877, he described the fungus, giving it the above name. Since 

 that time it has been met with quite commonly in this country. 

 In Saocardo's " Syllogo Fuugorum " we find a co]iy of Von 



