lo Maine; agricui^turaIv e:xpe;rime;nt station. 1909. 



even though it causes some injury, apple scab causes a far 

 greater loss than Bordeaux injury." 



At the same time there is need for a fungicide which will pro- 

 tect fruit trees from fungus diseases and yet never injure the 

 fruit and foliage. From the published results of preliminary 

 experiments made by Scott of the U. S. Department of Agricul- 

 ture, self-boiled lime-sulphur appears to have considerable merit 

 in this respect.t In experiments conducted at Bentonville, 

 Arkansas, the self-boiled lime-sulphur was found to be equally 

 as effective as bordeaux mixture in treating the bitter rot of 

 apple caused by Glomerella rufomoculans (Berk.) Sp. and von 

 Schr. It also appeared to be effective in controlling leaf-spot 

 caused by Sphaeropsis malorum Pk., and caused no injury to 

 the leaves. Its use on the more tender foliage of the peach at 

 Koshkonong, Missouri, produced no injury and at the same time 

 was very much more effective in controlling peach rot and scab. 

 Bordeaux mixture, applied at the same time, was so injurious 

 to the peach foliage that most of the leaves dropped off after 

 the second application. 



In view of the promising results recorded above it seemed 

 advisable to at once make tests of this new fungicide as a pre- 

 ventative of apple scab, — Venturia inaequalis (Cke.) Aderh.) 



Accordingly in 1908 a small orchard, consisting of about an 

 acre, planted to four or five varieties of apples on land in 

 Orono owned by Director Woods was very kindly set apart for 

 these tests. As originally planned one-half of the orchard was 

 to be sprayed with bordeaux mixture (3-3-50 formula) and 

 one-half with self-boiled lime-sulphur mixture using hot water 

 in preparation. However, after the first application, a letter 

 was received from Mr. Scott advising the comparison of hot and 

 cold water in making the latter preparation.* Therefore, one- 

 half of the lime-sulphur plot on the second and third application 

 was sprayed with a mixture prepared with hot water and one- 

 half with a mixture prepared with cold water. 



t Scott, W. M. Address before the American Pomological Society, 

 Sept., 1907. Circular No. i. Bureau of Plant Industry, U. S. D. A., 

 April, 1908. 



* This, on account of the fact that he had found that where the lime 

 is exceptionally good, enough sulphur can be brought into solution with 

 hot water to slightly burn the foliage. 



