362 



aiid a Zygaenid, Aglaope infausta, which, after M. neustria, was the 

 most serious almond pest during the year. Arsenical sprays, applied 

 in summer or after the crop has been gathered, are advised against 

 the last-named. 



DiFFLOTH (P.). La Lutte contre les Insectes nuisibles. — La Vie 



Agric. & Riiy., Paris, xviii, no. 22, 28th ^lay 1921, pp. 349-353, 

 4 figs. 



This article aims at making known the economic value of applied 

 entomology. The cases mentioned are those of dangerous plant 

 pests checked by parasitic insects. 



Thomsen (M.). Barkvikleren. [T\\e'B?i'ckTovincid.'\^Gartner-Tidende, 

 Copenhagen, .xx.xvi, 1920, pp. 189-191. 



The Tortricid, Enarmonia (Laspeyresia) tooeberiana, is here recorded 

 for the first time as a pest in Denmark. The larva attacks various 

 fruit trees, making irregular burrows in the bark and on the surface 

 of the wood ; on stone-fruit trees it causes extensive bark wounds and 

 exudation of gum ; on pear and apple trees the wounds are mostly 

 canker-like. Pupation occupies rather a long period, there being onl}'- 

 one generation of the moth a year. 



To prevent oviposition the wood should be cleaned and smeared 

 with lime or wood-tar. Similar treatment with a putty consisting 

 of 2 pints clay, 2 pints cow-dung and 1 pint slaked lime or wood ash. 

 with sufficient water to make a thick paste, is recommended for 

 preventing the escape of the moth from the wood. 



SiGGAARD (N.). Om Fromidder og deres Bekaempelse. [On Seed 

 Mites and Measures against them.1 — -Tidsskr. for Planteavl, 

 Copenhagen, xxvii, 1920, pp. 287-312. 



Several large stores of seeds in Denmark, especially those of crucifers, 

 have been heavily infested by mites, the species concerned being Tyrogly- 

 phus farinae, T. putrescentia and Glyciphagus domesticiis. The first 

 of these did the most damage, while G. domesticiis possibly only feeds 

 on the shells of the seed, fragments of straw, and other waste matter. 

 A predaceous mite, Cheyletus eruditus, was found feeding on the 

 Tyroglyphids. A characteristic periodicity appeared in the numbfir 

 of mites ; when the Tyroglyphids had become numerous the pre- 

 daceous mites also increased in number until they almost exterminated 

 them. It was found that the mites were dependent to an 

 important extent upon temperature and moisture, and the amount 

 of water in the seed itself was of importance. A measure recommended 

 against them is desiccation of the seed at 40-50° C. [104-122'' F.], an 

 apparatus being used by which the seed is moved about during the 

 drying process. 



Ferdinandsen (C.) & RosTRUP (S.). Oversigt over Sygdomme hos 

 Landbrugets og Havebrugets Kulturplanter i 1919. [Report on 

 Insect Pests and Fungus Diseases of the Field and Orchard 

 in 1919.] — Tidsskr. for Planteavl. Copenhagen, xxvii, 1920, 

 pp. 399-450. 



Among cereal pests, Oscinella frit did great dam.age to late sown 

 oats and barley. Chlorops taeniopits and Phyllotreta vittula were 



