NINETEENTH ANNUAL MEETING. 163. 



made on the condition of the foliage several times at inter- 

 vals during the season. 



in every case, except on Winesap, where Paris ^reen 

 was used with the commercial lime-sulphur solution the 

 foliage was badly burned, and in some instances the tree 

 sprayed with this combination lost half its foliage. The 

 \\ inesap did not suffer so much injury from this or any of 

 the sprays as did the other varieties. It seems from these 

 tests that it is entirely unsafe to use Paris green with the 

 lime-sulphur preparations. 



The commercial lime-sulphur at the rate of 1 '/, > gals. 

 to ?0 gals, of water and 2 lbs. of arsenate of lead, injured. 

 the foliage only slightly — scarcely enough to be notice- 

 able to the casual observer. At the rate of 2 gals, to 50 

 gals, of water with arsenate of lead this preparation injured 

 the foliage considerably, so that a small per cent of the 

 leaves dropped oft. This injury was manifested by a slight 

 scorching around the margins and at the tips of the leaves, 

 and in some cases by the formation of irregular brown 

 spots. Even here, however, the injury was no more severe 

 than that caused by 3-3-50 Bordeaux mixture on the same 

 varieties. 



At a strength of 2 to 50 without any poison, the com- 

 mercial solution injured the foliage slightly more than the 

 same mixture with the addition of arsenate of lead. . The 

 same is true of the \ l / 2 to 50 strength. The arsenate of 

 lead apparently reduced the caustic properties of the sul- 

 phides, rendering the mixture less injurious to apple 

 foliage. 



The same solution at a strength of 2'_> gals, to 50 

 gals, of water with and without arsenate of lead injured 

 the foliage very badly, causing a partial defoliation of the 

 trees. 



It appears from this test that 2 gals, of the commercial 

 solution to 50 gals, of water is the very maximum strength 

 that can be used on apple foliage with any degree of safety 



