32 



as when combined with Bordeaux mixture. A fuH account of 

 these experiments was pubhshed in Circular Xo. 54 of the Bureau 

 of Plant Industry. 



Experiments of 1910. 



During the past season experiments were conducted at Waynes- 

 boro, Va., on AA'inesap, York Imperial and Ben Davis. From 75 

 to 200 trees of such variety were sprayed and a check of about ten 

 trees of each varietv was left unsprayed. Each variety was divid- 

 ed into 4 plots and treated as follows : 



Plot I. Commercial lime-sulphur solution, i^/ to 50, with 2 

 lbs. arsenate of lead. 



Plot 2. Home-made lime-sulnhur solution, 2 lbs. of lime and 

 4 lbs. sulphur to so gals, water, with 2 lbs. arsenate of lead. 



Plot 3. Bordeaux mixture, 3 lbs. bluestone and 4 lbs. lime to 

 50 gals, water, with 2 lbs. arsenate of lead. 



Plot 4. Check, not sprayed. 



The Winesaps were sprayed, fi) after the cluster buds open- 

 ed, just before thev bloomed fApril 5) ; (2) as soon as the petals 

 fell (April 19) ; (3) three to four weeks later Qlav 17) : and (4) 

 nine weeks after the petals fell (June 26). The Ben Davis and 

 York Imperial received only three treatments, the first application 

 given the \\'inesaps having been omitted from these varieties, for 

 the reason that in A'irginia they do not suffer seriously from attacks 

 of scab. 



Effect on the Foliage. — The weather was unsually cold and 

 wet during April and ]\Iay and the conditions were favorable for 

 spray injury. Tov\-ard the end of Alay, soon after the second spray- 

 ing of the Ben Davis and Yorks, the leaves of these A-arieties showed 

 considerable spray injury on all the plots. On the lime-sulphur 

 plots the leaves of the voung shoots were somewhat scorched around 

 the margins, and as a consequence, some of them were crooked or 

 curled. A few dead spots appeared on some of the leaves and at 

 that time it looked as though the injury might prove serious. It 

 did not progress anv further, however, even after the next appli- 

 cation, and the trees soon grew out of it. Bv mid-summer nearly 

 all evidence of injury had disappeared and during the remainder 

 of the season the foliage was in excellent condition. In respect to 

 injury there was practicallv no difference between the home-made 

 and the commercial lime-sulphur. 



Bordeaux mixture caused more injury than either of the lime- 

 sulphur perparations and this injury increased as the season ad- 

 vanced. The leaves were more or less spotted with circular, brown 

 areas and a considerable percentage of them turned yellow and 

 dropped off. The trees sprayed with the lime-sulphur solutions 

 went through the season with much better foliage than those spray- 

 ed with Bordeaux mixture, demonstrating the superiority of the 

 former fungicide over the latter in this respect. 



