CONTROL OF THE CITROPHILUS MEALYBUG. 13 



readily collected under the bands preparatory to oviposition. 

 (Fig.V.) 



The success of burlap bands as used on the demonstration plot led 

 the growers throughout the infested area to adopt the practice. This 

 necessitated a large supply of burlap bands arid the problem was 

 solved by buying the burlap of 30-inch width in bolts of about 100 

 yards. The bolts were cut at a printing office under a large paper 

 knife into six rolls, 5 inches in width, which could readily be carried 

 into the orchard and cut in appropriate lengths for individual trees. 

 The ends of each band were fastened over a 4d finishing nail driven 

 into the trunk of the tree. The average orchard of 900 trees was 

 banded with one full bolt of burlap. The average cost in 1919 was 

 as follows : 



1 roll burlap (100 yards) $12. 60 



Cutting . 1. 00 



Nails .15 



Labor (1 man, 1 day) . ^ , 3.00 



16.75 

 Cost per tree, approximately $0.02. 



During April and May insects continued to descend in great 

 numbers, the burlap bands proving a center of attraction. In cases 

 of light infestation the majority of the descending insects would set- 

 tle beneath the band, and this was particularly true on smooth- 

 barked orange trees. (Fig. 8.) Lemon trees with the more irregu- 

 lar trunks and depressions where the main branches join the trunks 

 offered favored places for the mealybugs to settle, although even 

 these seemed less favored by them than the bands. By the latter 

 part of May hatching started, following which the larvae migrated 

 back to the foliage and fruit on the tree. Before this happened the 

 bands were removed and dipped in an effective insecticide, usually 

 pure petroleum distillate, and the trunks were then sprayed. 



Spraying. 



Spraying operations on the first 10 acres were conducted on May 

 23 and 24, and on June 6 and 7 on the second 10 acres. Only the 

 main limbs and trunks were sprayed and for this a petroleum dis- 

 tillate-soap emulsion applied with a power sprayer at 150 pounds 

 pressure proved most satisfactory. Two leads of hose with angled 

 Bordeaux nozzles were used. The burlap bands were removed and 

 thoroughly sprayed as the trunks were being sprayed. The formula 

 used was as follows: 



Distillate 28° to 30° B gallons,- 10 



Soap powder pounds— 20 



Water to make gallons__ 200 



If a lighter oil, as stove distillate, is used, the amount should be increased to 

 15 gallons. A good agitator is necessary in mixing the spray. After a few 



