186 



Dudley (J. E.). The Potato Leaf-hopper and its Control. — U.S. 



Dept. Agric, Washington, D.C., Farmers' Bull. 1225, August 

 1921, 16 pp., 14 figs. [Received 6th February 1922.] 

 The bulk of the information contained in this account of the life- 

 history and control of Empoasca mali (potato leaf-hopper) has already 

 been noticed [R.A.E., A, ix, 492]. 



QuAiNTANCE (A. L.). The Peach Borer : How to Prevent or Lessen 

 its Ravages; the Paradichlorobenzene Treatment. — U.S. Dept. 

 Agric, Washington, B.C., Farmers' Bull. 1246, October 1921, 

 14 pp., 12 figs. [Received 6th February 1922.] 



The life-history of Aegeria exitiosa, Say (peach borer), together 

 with the injury it causes and the remedial measures recommended, 

 are recorded [R.A.E., A, v, 368, etc.]. A wash recommended for 

 application after spring " worming " consists of 1 pt. lime-sulphur 

 concentrate to 6-7 pts. water, adding lime to give it the consistency of 

 heavy paint. A caustic wash of 1 lb. caustic soda or lye to 8 or 9 U.S. 

 gals, water, adding 10 lb. stone lime after careful slaking, applied in the 

 autumn destroys any borers that are more or less exposed on the tree. 



In 1915 experiments were undertaken with paradichlorobenzene ; 

 the application of this material, the preparation of the trees and the 

 injury it mav cause have already been noticed [^R.A.E., viii, 189; 

 ix, 325]. 



SiEGLER (E. H.) & Plank (H. K.). Experiments and Suggestions 

 for the Control of the Codling Moth in the Grand Valley of 

 Colorado.— C7.5. Dept. Agric, Washington, D.C., Bull. 959, 

 8th October 1921, 38 pp., 2 plates, 21 tables. [Received 6th 

 February 1922.] 



A detailed account of the spraying experiments carried out during 

 1916, 1917 and 1918 for the control of Cydia {Laspeyresia) 

 pomonella, L. (codling moth) in Colorado is given, together with a 

 summary of the results. 



Spray schedules based on the life-history studies of 1915 and 1916 

 are given and take into consideration the time each brood begins to 

 hatch and the time when the larvae are hatching in large numbers, as 

 well as the time hatching occurs in maximum numbers. Three sets 

 of schedules are presented, the first involves five applications, and is 

 intended for orchards lightly infested and for varieties on which the 

 pest is not difficult to control ; the second is for six applications for 

 medium infestations and for varieties on which it is moderately difficult 

 to control ; while the third is for seven applications for heavy infesta- 

 tions and for varieties on which the codling moth is most difficult 

 to control. 



Supplementary measures include banding, which is described, and 

 a trap as a substitute for the latter method, which has already been 

 noticed [R.A.E., A. v, 113]. 



WoGLUM (R. S.) Ik Borden (A. D.). Control of the Argentine Ant 

 in California Citrus Orchards.^ t/.5. Dept. Agric, Washington, 

 D.C., Bull. 965, 18th October 1921, 43 pp., 21 figs., 2 tables. 

 [Received 6th February 1922.] 



The bionomics and control of the Argentine ant {Iridomyrmex 

 humilis, Mayr) in Califomian citrus orchards are recorded [cf. R. A.E., 

 A, viii, 114, 285, etc.]. 



