thoroughly demonstrated. Thus a block. of 1,100 Elberta trees was 

 sprayed, first, with arsenate of lead at the rate of 2 pounds to 50 gallons 

 of water at the time the calyces, or shucks, were shedding; second, 

 with 2 pounds of arsenate of lead in self-boiled lime-sulphur mixture 

 (8-8-50) three weeks later; third, with self-boiled lime-sulphur mixture 

 alone a month later; and, fourth, with self-boiled lime-sulphur mix- 

 ture a month before the ripening period of the fruit. At picking time 

 95.5 per cent of the fruit from the sprayed block was free from brown- 

 rot, 93.5 per cent free from scab, and 72.5 per cent free from the cur- 

 culio. On the unsprayed block onh r 37 per cent of the fruit was free 

 from brown-rot, 1 per cent free from scab, and 2£ per cent free from 

 curculio injury. In packing the fruit for market it was found that the 

 amount of merchantable fruit on the sprayed block was ten times as 

 great as from the unsprayed block containing the same number of 

 trees. 



On a block of Waddell trees sprayed with the self -boiled lime-sulphur 

 mixture alone, one month after the falling of the petals and again one 

 month before the fruit ripened, the results were not quite so good, 

 owing to curculio infestation; but the yield of merchantable fruit 

 was, nevertheless, lot) per cent more than that on a similar block of 

 unspnvyed trees of the same variety. 



From these results and those of previous experiments we may con- 

 clude that the peach grower now has at his command a reasonably 

 safe and thoroughly effective remed} r for the peach scab, brown-rot, 

 and curculio. By carefully following the instructions given below he 

 should be able effectivel} T to prevent these troubles at a small cost. 



PREPARATION OF THE SPRAY MIXTURES. 



The sprays to be emplo}^ed are the self-boiled lime-sulphur mixture 

 and arsenate of lead. The arsenical is added to the lime-sulphur mix- 

 ture, permitting the treatment of both brown-rot and the plum curculio 

 at one and the same time. 



Self -hailed lime-sulphur mixture. — This mixture is composed of 8 

 pounds of fresh stone lime and 8 pounds of sulphur (either flowers or 

 flour ma}- be used) to 50 gallons of water. This appears to be about 

 the correct strength, although in mild cases of scab and brown-rot a 

 weaker mixture, containing 6 pounds of each ingredient to 50 gallons 

 of water, may be used with satisfactory results. The mixture can best 

 be prepared in rather large quantities — say, enough for 200 gallons at 

 a time, making the formula 32 pounds of lime and 32 pounds of 

 sulphur to be cooked with a small quantity of water (8 or 10 gallons) 

 and then diluted to 200 gallons. 



The lime should be placed in a barrel and enough water poured on to 

 almost cover it. As soon as the lime begins to slake the sulphur 

 should be added after first running it through a sieve to break up the 



[Cir. 120] 



