-29 - 
1930 
Sprengel, L. (145) 
Stand der Kenntnisse uber die biologische Bekampfung der Blutlaus 
( Eriosoma lanigerum Hausm.) mit Aphelinus mali Hald., in 
Europa. Gartenbauwissenschaft 4(1): 11-37. 
A history is given of the introduction of A. mali into various 
countries in Europe during the past 40 years. Notes are also 
given on the biology of the parasite, together with methods for 
its liberation. 
Van Poeteren, N. (146) 
Verslag over de Werkzaamhenden van den Plantenziektenkundigen 
Dienst in het Jaar 1929. Verslag. en Meded. Plantenziektenkund. 
Dienst Wageningen. 62, 142 pp. 
Aphelinus mali survived the very severe winter of 1928-29. 
Veitch, R. (147) 
Reports of the chief entomologist. Queensland Dept. Agr. Ann. 
Rpt., 1928-29: 67-71; 1929-30: 65-66. 
Aphelinus mali continues to check the woolly apple aphid. 
1931 
Baird, A. B. (148) 
Biological control of insect pests with special reference to vege- 
table insects. Ontario Veg. Growers' Assoc. Ann. Rpt. 26: 39. 
Aphelinus mali mentioned. 
Del Geurcio, G. (149) 
La vespina che libera il pomario della Schizoneora del melo e del 
pero e salva diecine di milioni alP economia nazionale ( Aphelinus 
mali Hald.) Redia 19: 253-307. 
Discusses the various forms of the woolly apple aphid, Eriosoma 
lanigerum (Hausm.). The establishment of its parasite, Aphelinus 
mali , saves Italy many millions of lire. 
Feytaud, J. (150) 
Rapports sommaires sur les travaux accomplis dans les laboratoires 
en 1930. Ann. des Epiphyt. 17(1): 62-112. 
The Bordeaux station has successfully disseminated Aphelinus 
mali against the woolly apple aphid. 
