142 PEACH LEAF CURL! ITS NATURE AND TREATMENT. 



sprayed trees above the yield of the unsprayed trees of 24.8 times the 

 yield of the latter. In other words, there was a gain in yield of 2,481 

 per cent from spraying. Much valuable information was also supplied 

 by Mr. Ciitts in relation to the preparation and application of sprays, 

 and the writer has considered these subjects in other portions of the 

 bulletin. Some of the more striking photographs of sprayed and 

 unsprayed trees have also been obtained from Mr. Cutts's orchard, 

 as well as the records of fruit buds elsewhere discussed (Pis. VII 

 and XX). 



The report of a test of the Bordeaux mixture (5 pounds copper 

 sulphate, 10 pounds lime, and 45 gallons water) was furnished by Mr. 

 H. B. Gaylord, of Auburn, Placer County. This experiment was 

 made in the spring of 1896. Mr. Gaylord sprayed 10 Heaths Cling 

 peach trees and 4 nectarine trees, the variety of which was not stated. 

 The spraying was done February 16. Mr. Gaylord states that the 

 unsprayed nectarines curled so badly that they bore no fruit at all, 

 while the 4 sprayed trees yielded 320 pounds. He says that every 

 alternate tree was sprayed in a row of nectarines, and that the sprayed 

 peach trees were in the worst places in the orchard. Respecting the 

 result of the work Mr. Gaylord writes, in part: 



I herewith send you a partial report on the experiment for leaf curl. I used only- 

 one formula. The result is perfectly satisfactory. I sprayed some peach and some 

 nectarine trees, both with good results. One nectarine tree sprayed has not a curled 

 leaf, while one of the same kind, about 15 feet from it, which was not sprayed, has 

 lost nearly all its leaves. The contrast is so great that it would be worth while to 

 have them photographed. A neighbor, Mr. G. P. Dixon, used formula 3 (2 pounds 

 copper sulphate, 3 pints ammonia, and 45 gallons water) with the same results, so 

 that I am satisfied that the copper sulphate is what does the work. 



Mr. Gaylord also states that no leaves were lost from the peach trees 

 sprayed, while all of the leaves curled on the unsprayed trees of the 

 remainder of the orchard. 



In Amador County an extensive experiment was made in the spring 

 of 1895, by Mr. George Woolsey, of lone. Mr. Woolsey sprayed some 

 2,600 trees of various varieties of peach and nectarine with 6 pounds of 

 copper sulphate, 10 pounds of lime, and 45 gallons of water, and left 

 720 trees unsprayed for comparison. The spraying was done from 

 February 20 to March 10. Most of the sprayed trees lost no foliage, 

 but a few in a wet situation lost not to exceed 25 per cent, while the 

 unsprayed trees lost not less than 50 per cent of the leaves and a large 

 amount of fruit. 



Mr. Woolsey gives some notes respecting the work in the spring of 

 1895, as follows: 



A block of about 200 trees, Salways 12 to 15 years old, on well-drained soil, and 

 500 Salways 4 years old, adjoining, I did not spray, thinking they were curl proof. 

 I regret I did not spray them. * * * The leaves are dropping, as well as a large 

 percentage of the fruit. I shall certainly spray them in the future. * * * The 



