212 THE PLUM CURCULIO. 
with this combined spray on peaches under varying climatic condi- 
tions seems to leave no doubt that by this combination the injurious 
properties of the arsenate of lead, as when used alone, are so reduced 
as to be practically negligible. This probably results from the ex- 
cess of lime in the self-boiled wash. In Circular 120 of this bureau, 
published in the spring of 1910, a schedule of applications for this 
combined spray was given, including 2 applications of arsenate of 
lead with an additional one of the lime-sulphur wash alone. This 
schedule was followed by many orchardists in the South and a large 
ageregate of trees was thus treated. The results have been uni- 
formly satisfactory, so far as controlling the curculio and the diseases 
are concerned, and without noticeable injury to the foliage and fruit 
above referred to. It may therefore be assumed that a satisfactory 
combined spray for the insect and the brown rot and scab of the 
peach has been established, as has so long been in use on other 
deciduous fruits. 
Results of further experiments with this combined spray for the 
curculio, brown rot, and scab during 1910 have been given in Far- 
mers’ Bulletin 440, fully confirming previous results as to its great 
usefulness for the practical control of these three troubles. It is 
practically certain that its use will be equally effective in preventing 
losses to other stone fruits, as plums, cherries, apricots, etc. Direc- 
tions for making the self-boiled lime-sulphur wash and arsenate of 
lead spray, with a schedule of treatments for peaches, are quoted 
from the bulletin above referred to. 
DIRECTIONS FOR THE PREPARATION OF SELF-BOILED LIME-SULPHUR 
WASH. 
The standard self-boiled lime-sulphur mixture is composed of 8 
pounds of fresh stone lime and 8 pounds of sulphur to 50 gallons of 
water. In mild cases of brown rot and scab a weaker mixture con- 
taining 6 pounds of each ingredient to 50 gallons of water may be 
used with satisfactory results. The materials cost so little, how- 
ever, that one should not economize in this direction where a valu- 
able fruit crop is at stake. Any finely powdered sulphur (flowers, 
flour, or ‘commercial ground” sulphur) may be used in the prepa- 
ration of the mixture. 
In order to secure the best action from the lime, the mixture should 
be prepared in rather large quantities, at least enough for 200 gal- 
lons of spray, using 32 pounds of lime and 32 pounds of sulphur. 
The lime should be placed in a barrel and enough water (about 6 
gallons) 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 lumps, if any are present. The mixture 
should be constantly stirred and more water (3 or 4 gallons) added 
