249 



Gnorimoschema banksiella, Busck, which was found infesting mum- 

 mied peaches. Norway maples were infested with a leaf-hopper, 

 Alebra albostriella, Fall., and soft maple leaves were generally infested 

 with a mite, Phyllocoptes quadripcs. Shim. 



This Bulletin also contains an appendix of 160 pages, which forms 

 Part VII of the author's monograph on gall-midges. 



AcKERMAN (A. J.). U.S. Bur. Ent. Arsenical Spray Residue on 



Harvested Fruit in relation to the Control of Codling Moth on 



Pears. — Mtlilv. Bull. Calijomia Dept. Agric. Sacramcnlo, xi, 

 no. 1, January 1922, pp. 12-28, 5 figs. 



From the experiments here described it is evident that the codling 

 moth [Cydia pomonella, L.] may be controlled, and arsenical spray 

 residues avoided, by the use of proper methods. Spraying should be 

 done very thoroughly with a good equipment at a high pressure. In 

 pear orchards where the infestation is not very serious three sprays 

 should prove sufficient ; they should consist of a calyx spray, another 

 three to four weeks later just before the first larvae hatch, and a third 

 two to three weeks after the second just previous to the hatching of 

 the maximum number of larvae of the second brood. If necessary 

 a fourth spray may be applied two to three weeks before the first 

 picking of the fruit. If the infestation is very heavy, it is advisable to 

 apply a second calyx spray seven to ten days after the first. Coarse 

 drenching should be avoided by using a nozzle with a disk opening 

 of about ^V inch for cover sprays. Even with a very fine spray it is 

 essential that the last cover spray be applied two to three weeks 

 before the first picking. The strength advocated for the sprays is 2 lb. 

 lead arsenate paste to 50 U.S. gals, water at a pressure of 225 to 

 250 lb. Dusting is not advocated, as even four or five applications 

 failed to control the infestation. 



EssiG (E. O.). Para-diehlorobenzene, a Soil Fumigant. — Mthly. 

 Bull. California Dept. Agric, Sacrametiio, xi, no. 1, January 1922, 

 pp. 28-30, 1 fig. 



The method of applying paradichlorobenzene for the control of the 

 peach tree-borer, Aegeria exitiosa, Say, is described [cf. R.A.E., A, 

 ix, 325]. In California, applications should be made between May 

 and November provided that the soil temperature is over 55° F. and 

 the soil moisture not excessive. The conditions in Cahfomia are so 

 different from those in the southern and eastern States that unusual 

 problems may be expected in the handling of the material and its 

 uses may be greatly enlarged. A. exitiosa infesting apricot trees on 

 myrobalan stocks has been successfully treated without any injury to 

 the trees. Paradichlorobenzene is apparently also effective against 

 Eriosoma lamtginosum, Hartig, infesting three- and four-year-old 

 pear trees. 



DuRUz (W. P.). The Peach Twig-borer and its Control. — Mthly. 

 Bull. California Dept. Agric, Sacramento, xi, no. 1, January 1922, 

 pp. 58-62, 3 figs. 



Anarsia lineatella, Z., is widely distributed in California, where it 

 attacks peach, almond, apricot, nectarine, plum and prune. The 

 annual loss caused by this moth amounts to over ;£200,000. With 



(6239) R 



