617 



BoRXER (C). Die Vernichtung der Reblaus durch vonibergehenden 

 Anbau von Pfropfreben. [The Destruction of the Vine Louse by 

 the temporary Cultivation of grafted Vines.] — Reprint from 

 Der Deutsche Weinhau, n.d., 2 pp. [Received 19th October 

 1922.] 



In a preceding paper the planting of vines immune and half-immune 

 from Phylloxera pervastatrix (apparently the only form in Germanv) 

 was advocated and that of resistant varieties was objected to 

 [R.A.E. A, X, 255]. 



Experiments are needed to settle whether the south European form, 

 P. vastatrix, is unable (as the author supposes) to thrive in Germany. 

 The planting of resistant vines implies that the cultivation of this type 

 alone would have to be continued indefinitely, whereas if such vines 

 were prohibited and only immmie or half -immune stocks were grown, 

 grafting would serve as a weapon for the destruction of the pest and 

 could be abandoned entirely when all traces of infestation had died 

 out. Research is necessary to determine whether the southern and 

 northern forms of Phylloxera are the same, with a gradual specialisation 

 of the latter to certain varieties of vine, or whether the northern forms 

 are more closely related and constitute a sub-species differentiated 

 from the southern. 



Speyer (W.). Zur Kenntnis der Lebensweise und Bekampfung des 

 ApJelbliitenstechers [Anthonomus pomoriim). [A Contribution 

 to the Knowledge of the Habits and Control of the Apple Blossom 

 Weevil.] — Nachrichtenhlatt deiUsch. Pflanzenschiitzdienst, Berlin, 

 ii, no. 10, 1st October 1922, pp. 82-83. 



Observations made near Naumburg, in 1922, show that when the 

 adults of Anthonomus pomornm emerge from hibernation the males 

 are mature and ready to mate. The first eggs, however, are not 

 ready for deposition until about a fortnight later. A female la}'S 

 about 100 eggs. Only two-thirds of the individuals taken in March 

 and April died between the end of the oviposition period and mid- July, 

 and some were alive in September. On the other hand young adults 

 were taken in June and July. On 24th July three old adult females 

 with large ovaries and full spermathecae w^ere captured. It is 

 therefore possible that the weevil lives for two years and has two 

 oviposition periods. Experiments showed that arsenicals are of 

 doubtful value against this wxevil, but further work is being done on 

 the point. 



Bekanntmachung vom 17. Juli 1922 iiber die Schadlingsbekampfung 

 mit hochgiftigen StoJfen. [Notice of the 17th July 1922 regarding 

 Pest Control with highly poisonous Substances.] — Nachrichtenblatt 

 deutsch. Pflanzenschutzdienst, Berlin, ii, no. 10, 1st October 1922, 

 p. 86. 



This regulation, with effect from 1st October 1922, restricts the 

 use of hydrocj^anic acid and similar intensely poisonous materials 

 to Government departments, research institutes and such bodies as 

 may be specialh* approved of by the Imperial Ministrj' of Food and 

 Agriculture. 



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