356 Acarology 



merous enough to be of material importance in reducing the popula- 

 tion. It has been found preying on many species, among which are the 

 following: 



Lepidosaphes ficiis (Sign.), on fig, CaUfornia 



L. iilmi L., in France, Germany, Pennsylvania, and eastern Canada 



L. becki (Newman), on citrus, California 



Parlatorio oleae, on olive, California 



Aspidiotus latanae, in insectaries, California 



Diaspis canieli Targ., on cypress, Bermuda 



Aonidiella perniciosa Comstock, in France 



Chionaspis salicis L., in Germany 



The eggs of Lepidosaphes appear to be the favorite food. Tothill 1918 

 studied the mite and found it "perhaps even more useful than has been 

 supposed." In certain areas of eastern Canada he found the oyster- 

 shell scale controlled by the mite. He states: "It at least seems certain 

 that when the scale is abundant this mite is the most important single 

 factor operating toward control in eastern Canada. In places where 

 the host is less abundant, the mite becomes proportionately less effi- 

 cient." Hemisarcoptes mains (Shimer) was found attacking the latana 

 scale, Aspidiotus latanae being reared in the insectary of the Citrus 

 Experiment Station, Riverside, California, for parasite studies. Cor- 

 respondence from B. Bartlett and P. DeBach stated that the work on 

 rearing was being disrupted by this mite. 



References: * 



Andre, M. 1942. Sur I'Hemisarcoptes malus Shimer (= coccisugus 

 Lignieres) (Acariens). Bull. Paris Mus. d'Hist. Nat., Ser. 2, 14(3): 

 173-180. 



Ewing, H. E., and R. L. Webster. 1912. Mites associated with the oyster- 

 shell scale (Lepidosaphes ulmi Linne) Psyche 19:121. 



Lord, F. T. 1947. The influence of spray programs on the fauna of apple 

 orchards in Nova Scotia: II. Oyster-shell scale. Canad. Ent. 79(11, 

 12): 196-209. 



Shimer, H. 1868. Notes on the apple bark-louse (Lepidosaphes conchi- 

 fonnis, Gmelin sp.), with a description of a supposed new Acarus. 

 Trans. Amer. Ent. Soc. 1:368. 



Tothill, J. D. 1918. The predaceous mite, Hemisarcoptes malus Shimer, 

 and its relation to the natural control of the oyster-shell scale, Lepi- 

 dosaphes ulmi L. Agr. Gaz. Canada 5(3) : 234-239. 



