18 



BULLETIlsr 1040, U. S. DEPARTMENT OF AGRICULTURE. 



acreage was banded with burlap in the spring of 1919. Of the area 

 infested with the mealybug in that section all but 10 acres were 

 sprayed according to the methods outlined, with excellent results 

 throughout. The 10-acre orchard was left as a check for control by 

 natural enemies. 



The ant control was handled partly by the growers themselves, 

 partly by the citrus associations of which the orchardists were mem- 

 bers, and partly by 

 contract operators. 

 The sirup was for the 

 most part prepared 

 by the citrus associ- 

 ations, or purchased 

 from druggists at a 

 cost of $1.50 to $2 a 

 gallon. The spice 

 tin was the pre- 

 ferred container. 

 The average cost to 

 the grower for ant 

 control, including 

 refilling where nec- 

 essary, was 4 to 6 

 cents per tree. The 

 cost of burlap band- 



FiG. 10. — Adult of Leucopis iella. Greatly enlarged. ino" averao"ed 2 CCnts 



per tree. The cost of trunk spraying varied. On dense, unpruned 

 lemon trees, headed low, spraying proved somewhat diiScult and 

 slow. The amount of material used on such trees was also greatest. 

 High-headed orange trees with smooth trunks were most easily 

 and effectively sprayed. 



These spray operations were conducted by the growers and com- 

 mercial outfits and an average of 10 acres a day was covered at a cost 

 approximating the figures given for the two demonstration plots, the 

 cost being more or less proportional to whether the trees were well 

 pruned and open or unpruned and difficult to spray. Work carried 

 out by the owners themselves was for the most part thoroughly done. 

 A few orchards were trunk-treated by hand. 



The general results of the control campaign of 1919 at Upland 

 were very gratifying. Orchards which had shown severe infesta- 

 tions in the spring of 1919 were commercially clean in the spring 

 of 1920. The reduction in grade or total loss of fruit from mealy- 

 bugs had been reduced to a negligible factor. Packing-house man- 

 agers and growers were convinced that the citrophilus mealybug 

 was no longer a menace to their orchards and that the control of 



