REPORT OF THE STATE ENTOMOLOGIST 1906 49 
and vicinity, only a few miles to the north. The scurfy scale, for 
- some reason, has been abnormally abundant in this section, af- 
fecting mostly young fruit trees. Experience has repeatedly shown 
the practicability of controlling this pest by timely applications 
of contact insecticides, either whale oil soap or kerosene emulsion, 
the latter part of May or early in June at the time the minute, 
reddish young are crawling in large numbers. 
San Jose scale (Aspidiotus perniciosus Comst.). This 
insect is one of prime importance to the small as well as the large 
fruit grower. The latter, if he is to continue in business and 
has infested orchards, must find some way of controlling the pest. 
The small fruit grower will soon find his fruit of very little value 
if this insect is ailowed to breed unrestricted on the trees for a 
period of several years. The experiments and experience of the 
past decade have shown beyond all question the practicability of 
controlling this dangerous scale insect. The weight of evidence is 
decidedly in favor of employing a lime-sulfur wash which, if prop- 
erly prepared and thoroughly applied, will give fully as satis- 
factory resuits as any other preparation. Recent experience has 
demonstrated the absolute necessity of great care in the making 
of this compound and thoroughly emphasized the value of most 
careful application. 
Several experiments were conducted the past season, largely 
for the purpose of determining whether the lime-sulfur wash could 
be further modified to advantage. A lime-sulfur wash was made 
in the normal manner except that the ordinary burnt lime of this 
vicinity was replaced by a finely prepared hydrated magnesium 
lime known as limoid. The results were decidedly adverse to the 
employment of this material despite its improved physical condition. _ 
The reaction between the limoid and the sulfur was not nearly so 
vigorous, even when hot water was employed. 
The following formula was used with very satisfactory results: 
20 pounds of lime, 15 pounds of sulfur, 12 pounds of sal soda with 
50 gallons of water. Half amounts were taken, the materials mixed 
together dry, and then two pails of hot water added. The re- 
action began in about two minutes and was quite vigorous though 
no cold water was necessary to keep the mixture within a half 
barrel. The compound was very satisfactory and there was very 
little sediment. This wash was applied April 13 to both moder- 
ately and very badly infested apple trees. An examination May 
19 showed that this wash adhered fully as well as the others and 
