No. 7. DEPARTMENT OF AGRICULTURE. 657 



boiled preparation, especially in the control of peach diseases, and 

 also of Quaintance in showing its value in the summer control of 

 scale on peach are worthy of special note. Wallace's extensive work 

 at Cornell against apple diseases, his development of a laboratory 

 method of testing fungicides, his demonstration of the special value 

 of the lime-sulphur-lead-arsenate combination, and his emphasis of 

 the relation between broken epidermises, by scab or insects, and 

 lime-sulphur injury are also noteworthy. This injury is thus brought 

 in line with that of Bordeaux, as i)ointed out by Crandall in Illi- 

 nois, and with that of arsenicals, as pointed out by Gillette in 

 Iowa (Iowa Bui. 1(1, 1890). Parrott, at Geneva, has demonstrated 

 the value of sulphur sprays against blister mite, and has shown 

 the worthlessness of the sediment against scale. Van Slyke and 

 Bosworth at the same place have em])hasized the general undesira- 

 bility of magnesium in the lime used in the ingredients; and Waite 

 at Washington has called attention to possible values of copper and 

 iron sulphids. Besides these workers, Taylor in Missouri, Fulmer 

 and Caesar in Ontario, Bonus in Maine, Ballard and \"olck in Cal- 

 ifornia, and many others are doing their share in the present move- 

 ment of advancing, verifying and perfecting our knowledge of the 

 making and use of suli)liur sprays, aud still there is work to be 

 done. 



THE SUMMEK SPRAYING OF PEACHES 



By J. P. STEWART, State College, Pa. 



During the season of 1910, an opportunity was offered to the 

 Department of Experimental Horticulture, at State College, to 

 make some further studies on the summer spraying of peaches. A 

 block of trees in the extensive orchard of Mr. W. Fred Reynolds 

 of Bellefonte was very kindly offered for this' purpose, and the 

 necessary additional assistance was provided in the Department. 

 The results secured, though not conclusive in all cases, are believed 

 to be of sufficient interest to warrant presentation at this time, es- 

 pecially as a report of progress. 



The primary object of spraying peach orchards in summer is 

 to control brown rot. The control of curculio is a prerequisite for 

 this, and the practical prevention of peach scab, the black spotted 

 disease that often cracks the fruit and makes it more or less lop- 

 sided, is incidentally secured. The object in our work was essen- 

 tially to try out the best known method of accomplishing these 

 ends, and to compare it with other available sprays in order to 

 secure possible improvements. The relative safety of these sprays 

 upon the foliage and fruit was also considered, as Avell as their ef- 

 fect upon the carrying quality of the fruit in shipment. 



In the experiment, a block of some 280 trees about 10 years old 

 were chosen. The i)each trees were Early Crawford, which had 



42—7—1910 



