133 



but It IS signihcant that the moth has produced only one genera- 

 tion in a season in these areas, which has considerab y l^ifed the 

 damage. It is possible, however, that two generations may prove to 

 be the normal condition, as in other regions. It is suggested that 

 more thorough scouting work is necessary to locate and Report upon 

 scattered and isolated infestations. The agencies producing these 



ai?wav"'r' '"''''"'r f ! ""' ^'' known'but it s^eems as ^though 

 laiivvay. aie an important factor m carrying the moths, as both the 

 eastern and western areas in New York State have good railway con- 

 nections with the older infested area in Massachusetts iTfs not 



^vvtor^'st ^'T"T^.°^ "^ -ngle generation, even if normalin 

 New \ork State, will extend to the southern and warmer maize- 

 growing be t, and the sparsely infested areas are regarded as aTreat 

 menace to the maize crop of America. S'""ea as a great 



^^'der^SPhhinSL^"^^^^'^^^^^ ^^ Biologischen Kenntnis 



der Schlupfwespe, Lanop/mgus distmgnendus (Forst.), Kurdj 



Contributions to the Morphological and Biological Knowledge 



of L. distingiiendmJ-Sitzimosbcr. Ges. Katnrforsch. Freunde 



Berhn^ December 1919, no. 10, 10th Februaiy 1920, pp. 402-432,' 



parlsitiTol^l'h^lf ^''^J'i?^'?^}^,^^ Lanophagus distinguendus, Forst., 

 parasitic on the larvae of Calandra granaria, L., are described Details 



enect ot external influences such as light and heat. 



Le Service phytopathologique aux Pays-Bas. [The Plant Protection 

 SZf W '"'■ ^^^^therlands.]-F.../a,..n en Meded. Phvtopath. 

 Src^mberS.f'"' "' ^""' ''"'' ^ ^P" ^Received 30th 



Pl^V^^llont?:^'^ ''' °^^--^^-^ -d ^"ties of the Dutch 



Het Stengelaaltje {Tyknchus devastatrix). Het Bieten of Haveraaltie 



{He^erod.ra Mtu). Het Wortelaaltje {HcteroderaTMcftoX 

 [The Stem Eelworm. The Beet or Oat Eelworm. The Root 



?0 ^^i'dM''^^ "^r^^' '^-Semngen, Mugschr. nos 19 

 ■i-yj, 21, December 1919, 12 pp., 15 figs. 



mc^hods°for^'oL'n7.V"H"^^'\f ^ information about, and combati^■e 

 mctliods lor, one of the three Nematodes named above. 



^""^ en' EsmL^^ . rr^pf ^^y"°^l"^"e. La Crise des Porte-Greffes 

 en Jispagne. (Ihe Phylloxera Question. The Crisis of Grifted 



^^o'-^v'^lf^^^^^^ -^^ 1^-12' November-December, 



When the resistance of American vines to Phylloxera was pro^•ed in 



p2;\ as solveT'V^":? '''' P'^'^l^"^ "^ P^^^^^^"-^ vineyards Lmthi^ 

 sou hern vlZt ' ^^'?' T'" ^^' ^^°"^ ^^"^^ "^ ^^ality to those of 

 southern Europe, a number of species were grafted c^i to the old stock 



