424 REPORT OF THE DEPARTMENT OF ENTOMOLOGY OF THE 
ordinary home-made mixture as it is used in this State for 
the treatment of the San José scale. To determine the 
strengths of efficient mixtures, experiments were made with 
commercial brands at various dilutions for the treatment of 
the scale and leaf blister-mite. 
EXPERIMENTS WITH CONCENTRATED SOLUTIONS ON THE SCALE. 
The concentrated lime-sulphur wash used in these experi- 
ments tested 35° Beaumé and was free from sediment. The 
range of dilution was from one gallon of the clear solution with 
four gallons of water, to one gallon of the concentrate with fif- 
teen gallons of water. Tests were made once in 1908 and were 
repeated in three different plats during 1909. The trees were 
of the same age and variety, and were generally well infested 
with the scale. 
Results on scale and discussion.—As compared with un- 
treated trees, all of the applications at the range of dilution 
given showed improvement in the conditions of the trees with 
respect to the scale. As was to be expected, the stronger mix- 
tures, broadly speaking, were more efficient and gave uni- 
formly better results than the weaker preparations. However, 
the experiments did not indicate as decisively as was desired 
the exact dilution, which, from the standpoints of reasonable 
efficiency and cost, would make a satisfactory spraying mix- 
ture for average orchard conditions. For practical use, the 
strengths of effective mixtures seem to range from one gallon 
of the concentrate diluted with eight gallons of water, to a dilu- 
tion as weak as one gallon of the solution to eleven gallons of 
water. Until there is more evidence by the fruit growers them- 
selves, showing the range of safe dilution for commercial mix- 
tures under the usual orchard conditions, it appears from 
these results that it would not be safe to take chances with as 
weak mixtures as have been advised. For spraying for the 
scale, especially if abundant, it is recommended that a lime- 
sulphur solution, testing 83° Beaumé, be diluted in the pro- 
portions of one gallon to either eight or nine gallons of water. 
Brands of less concentration should be diluted with propor- 
tionately less amount of water. In orchards that are regularly 

