COISTTKOL OF THE CITROPHILUS MEALYBUG, 15 



be effective, must be thorough and to accomplish this it is necessary 

 to go beneath the tree. The most satisfactory work was done when 

 the nozzle was connected directly to the hose, allowing free manipu- 

 lation in any direction. A long rod should never be used as it does 

 not allow the ready manipulation necessary on heavily branched 

 trees to spray from any direction. 



The trees on the demonstration plot were of an open type with 

 smooth trunks and high headed, so they could be entered with ease 

 and quickly and thoroughly covered with spray. It required only 

 3^ tanks of spray to cover each of the 10 acres. The cost (1918) is 

 summarized herewith : 



35 gallons distillate, at $0.05 per gallon $1. 75 



70 pounds soap powder, at $0.05 per pound 3. 50 



Team and teamster for IJ days 9. 00 



Two men spraying for 1^ days 9. 00 



Gasoline and oil 1. 25 



Total 24. 50 



Cost per tree, $0,036. 



The time, 1^ days, included considerable engine trouble. Fifty- 

 two trees were sprayed in 30 minutes, A tank of spray (200 gallons) 

 covered approximately 200 trees. 



Several days after the spraying the burlap bands, now dry, were 

 replaced on the tree trunks and left for a year. At no time were 

 insects noted under the bands except an occasional one, which the 

 natural enemies destroyed before oviposition was completed. 



Throughout the following fall and winter (1918-19) it was very 

 diflEicult to find even individual mealybugs, and the packing house 

 handling the fruit reported it to be cleaner than any that had been 

 turned in during the five preceding years, with an increase of grade 

 amounting to from 30 to 40 per cent. 



During the spring of 1919 an inspection was made of the demon- 

 stration plot and very few mealybugs and no ants were found. 

 Under the old bands not more than 10 to 12 insects were found on 

 any one tree. The grove was sprayed again by the owner in June 

 of 1919, as outlined above. An inspection in May, 1920, showed a 

 practically clean grove, not more than 5 insects being found under 

 the bands of any tree, and most of the trees were entirely free of 

 mealybugs. 



EXPERIMENT NO. 2. FARLOW GROVE, 888 TREES. 



In the summer of 1919 a second demonstration plot was employed 

 which consisted of 10 acres of heavily infested oranges. Ant control 

 and banding had been carried on the previous spring, and the ants 

 were greatly reduced at the time of spraying. In this grove, as in 

 the former, a power sprayer with two leads of hose and Bordeaux 



