9G 



ScHULZ (U. K. T.). Beitrage zur Biologic von Lariophaf^us distin- 

 gnendus, Forst. i^Contributions to the Hi()l()g\- of L. disdngiicndiis, 

 Forst.] — Siizungsber. Ges. Naturfoysch. Frcunde, Berlin, November 

 1919, no. 9, 16th January 1920, pp. vS75-377, 3 figs. 



The parasitism of Calandra granaria, L., by Lariophagus distin- 

 guendiis, Forst., is discussed. 



Metalmkovv (S.). L' Immunity naturelle et acquise chez la Chenille 



de Gallcria mellonella. FNatural and acquired Immunity in the 

 Cateii)illars of G. mellonella.] — Ann. Inst. Pasteur, Paris, xxxiv, 

 no. 11, November 1920, pp. 888-909, 5 figs. 



The technique employed during a series of experiments on the 

 natural and acquired immunity of the larvae of Galleria mellonella is 

 described. The results of these observations have been noticed 

 elsewhere [R.A.E., A. viii, 163, 367 ; B, viii, 86]. 



VAN PoETEREN (X.). Veislag ovef de Werkzaamheden van den 

 Phytopathologischen Dienst in het Jaar 1919. [Report on the 

 Work of the Phytopathological Service in the Year 1919.] — 

 Verslagen en Meded. Phytopath. Dienst, Wageningen, no. 12, 

 June 1920, 48 pp. [Received 30th December 1920.] 



A Nematode, Tylenchns devastatrix, infested clover ; another 

 species, T. pratensis, de Man, occurs in the roots of Convallaria (lily 

 of the valley) intended for export, and attempts are being made to 

 find a remedy for it. Porthetria dispar attacked shade-trees. Apple 

 tree pests included the woolly aphis [Eriosoma lanigerum], of which 

 the winged individuals were observed for the first time in Holland. 

 Benzine is said to give excellent results against this pest. Paratetrany- 

 chiis sp. was reported several times, and Hyponomeiita sp. was abundant 

 in Zeeland. The bags used to protect graftings against Phyllobiiis 

 must be tied tightly to prevent this beetle from entering. 



Incnrvaria capitella infested red currants. A bug, Lygus sp., caused 

 some injury to beans ; no effective remedy has been found to obviate 

 the frequent replacement of sticks rendered necessary by the fact 

 that old sticks favour infestation. They appear to lead to the infesta- 

 tion of the new crop, though neither eggs nor larvae could be found 

 on them in winter. Attempts to disinfect the old sticks with car- 

 bolineum were unsuccessful. L. pabulinus and L. pratensis severely 

 injured Viburnum. Pieris brassicae and P. rapae did considerable 

 damage to cabbages. 



In North Brabant bees were poisoned in large numbers, and as traces 

 of copper and arsenic were found, the sprays used against Pteronus 

 ribesii and Cheimatobia brumata appear to have been the cause. The 

 difficulty can be overcome by a regulation fixing the date for spraying 

 against P. ribesii after blossoming, while C. brumata can be checked 

 by spraying its eggs in winter with carbolineum. 



The investigations on apples and pears infested with insect larvae 

 are not yet complete, but it has been ascertained that most of the 

 larvae in young fallen apples are those of the sawfly Hoplocampa 

 testudinea ; the caterpillars of Cydia (Carpocapsa) pomonella appear 

 at a later date. More fruits are infested by Hoplocampa than by 

 Cydia. Spraying with Paris green will check both these pests to a 

 considerable degree. 



