CONTROL or THE CITROPHILUS MEALYBUG. 



17 



HAND-TREATMENT METHOD. 



In a 5-acre citrus orchard, comparatively lightly infested with 

 mealybugs 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. 



5 per cent . 

 10 per cent 

 25 per cent 



Poor killing 



50 per cent killing . 

 100 per cent killing 



No effect. 



Poor. 



Excellent. 



The 25 per cent solution is prepared as follows : 



Place 6 quai'ts of water in a bucket and thoroughly dissolve i 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 californica. Much enlarged. 



Several growers have used this method successfully on light in- 

 festations, w^here 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 



