CONTROL OF THE CITROPHILTJS MEALYBUG. 17 
HAND-TREATMENT METHOD. 
In a 5-acre citrus orchard, comparatively lightly infested with 
mearybugs and banded early in the spring of 1919, the hand-treat- 
ment method was effectively employed. This consisted of removing 
the bands and dipping them in a bucket of 25 per cent distillate- 
soap emulsion, wringing the bands out dry, scrubbing the trunks with 
a suitable brush, and replacing the bands. 
Different strengths of the emulsion were tried with results as 
shown in Table 3. 
Table 3. — Results of hand-treatment method against the citrophilus mealybug. 
Strength of solution . 
Effectiveness — 
On adults. On egg masses. 
Poor killing No effect. 
10 per cent 
25 per een t 
50 per cent killing : Poor. 
100 per cent killing Excellent . 
The 25 per cent solution is prepared as follows : 
Place 6 quarts of water in a bucket and thoroughly dissolve J pound of soap 
powder. To this slowly add 2 quarts (30° Baume) distillate while constantly 
stirring. Attach the bucket pump and pump the solution back into the bucket 
through a mist nozzle until a perfect emulsion, free of oil globules, is obtained. 
The emulsion should be used soon after preparation. 
Fig. 9. — Adult of Chrysopa calif ornica. Much enlarged. 
Several growers have used this method successfully on light in- 
festations, where followed up at intervals of about every two weeks 
from the middle of May to the latter part of June, at a cost of 2 cents 
per tree for each treatment. It is as important to effect ant eradi- 
cation when this method is employed as it is with the regular trunk- 
spray method. 
CONTROL WORK— UPLAND DISTRICT, 1919. 
The great success of the demonstration work of 1917 and 1918 led 
to the general adoption of the control methods by the growers 
throughout the infested area. (Fig. 5.) Up to and including 1919 
ant control was practiced on 630 acres. The entire mealybug-infested 
