20 



BULLETIX 1040, U. S. DEPAETMEXT OF AGFJCULTURE. 



1916 and proved so effective that several hundred "vvere distributed 

 beneath a tented citrus tree at Upland during the autumn of 1917. 

 Some specimens successfully passed the winter and started breeding 

 freely the following spring. The Insectary Branch of the California 

 State Commission of Horticulture followed the Avriters" lead and has 

 since distributed many thousands over the Upland district, with such 

 successful returns that the work should be supported and continued. 



SUMMARY. 



(1) Ant control. This is most effectively accomplished by the use 

 of a special arsenical poisoned sirup in small containers, one to each 



tree. Best results follow dis- 

 tribution during the autumn or 

 spring. 



(2) Trunk banding. Strips of 

 burlap about 5 inches wide 

 should be placed around each 

 tree trunk, from February to 

 April, to attract ovipositing fe- 

 male mealybugs. 



(3) Eemoval and dipping of 

 burlap bands in distillate. This 

 should precede the trunk spray- 

 ing. The bands should be dry 

 when replaced after the trunk 

 treatment. 



(4) Trunk treatment. Spray 

 thoroughly with distillate-soap 



powder emulsion after the meah'bugs have massed on the trunks 

 and just before the eggs begin to hatch. This is usually during the 

 latter part of Mslj. 



(5) The propagation and distribution of Cryptolaemus viontrau- 

 zieri^ Leucopis hella. Chrysopa spp., and Scymnus sordidus are to 

 be recommended. 



of Ci yptolarmuy. 

 Mucn enlarged. 



ADDITIONAL COPIES 



OF THIS PrBLICATION MAY BE PROCURED FROM 



THE SCPERINTEXDEXT OF DOCUMENTS 



GOVERNMENT PRINTING OFFICE 



WASHINGTON, D. C. 



AT 



5 CENTS PER COPY 



V 



