CONTROL OF THE CITROPHILUS MEALYBUG. 



9 



The first operation 

 branches from the 

 ground so as to 

 force the ants to as- 

 c e n d the trunks 

 where the poison 

 was placed. Two 

 men trimming aver- 

 aged 78 trees per day 

 (tf 8 hours at a cost 

 of approximately 8 

 cents per tree. The 

 orchard was in a 

 state of clean culti- 

 vation and entirely 

 free of weeds be- 

 neath the trees. 



Ant control was 

 begun on about 1 

 acre of the first 10 in 

 September, and the 

 remainder complet- 

 ed by October 5, 

 1917. ^ The second 10 

 was covered by ant 

 control in Novem- 

 ber, 1917. An ar- 

 senical- sweetened 

 sirup, known as the 

 Barber formula, was 

 used for the first 

 distribution in this 

 orchard, a small 

 amount being placed 

 in each container, 

 one of which was at- 

 tached to each tree. 

 (Fig. 6.) Complete 

 eradication was ef- 

 fected the following 

 spring at a cost of 

 ^.6 cents per tree on 

 the first 10 acres and 

 at a cost of 4.9 cents 

 per tree on the second 10 acres. 



78472—22 2 



undertaken was the trimming up of th( 



7y 



<A 



Fig. 



Citrop'hilus mealybug control 

 trict, 1917-1919. 



aiea«. Upland dis- 



The control is summarized in Table 1. 



