478 



Bloedluis {Schizoneura lanigera). [The W'oolly Apple Aphis, Eriosoma 

 hniis^erum.] — Plantenziektcnk. Dienst, Wageningen, ^']ugschr. 29, 

 February 1921, 4 pp., 1 fig. [Received 3rd August 1921.] 



This circular briefly describes the life-history and control of Eriosoma 

 lanigerum. 



De slakvormige Bastaardrups der Oof tboomen, de Larve van de Bladwesp 



Eriocampoidcs liniacina, Retz. (= Selandria adumbrata, Klug). 

 [The Fruit-tree Slug, Larva of the Saw-fly, E. Umacina.] — 

 Plantenziektenk. Dienst, Wageningen, \lugschr. 30, March 1921. 

 2 pp., 1 fig. [Received 3rd August 1921.] 



In Holland Eriocampoides liniacina, Retz., chiefly injures pears, 

 while cherries, apples, apricots, and sometimes also beeches, oaks 

 and such ornamental plants as Pyriis japonica, are also attacked. 

 A small number of larvae appear in June and July, and a considerable 

 increase is often noticed in August and September, so that there may 

 be two generations a year. The measures advised are collection or 

 crushing, and dusting with insect powder or with finely powdered 

 lime that has been recently slaked. A Paris green or lead arsenate 

 spray ma}' also be used. 



Beukenwolluis {Cryptococcus fagi, Dougl.). [The Beech Scale, C.fagi.] 

 Plantenziektenk. Dienst, Wageningen, Vlugschr. 31, March 1921, 

 2 pp., 1 fig. [Received 3rd August 1921.] 



The life-history of Cryptococcus fagi, Dougl., is briefly described. 

 Wind is chiefl}' responsible for the spread of this Coccid, the injury 

 done by which does not appear to be as important as was formerly 

 supposed. A good remedy consists in scrubbing the bark with a 

 7^ per cent, solution of carbolineum ; this is better than spraying. 

 It is advisable to repeat the treatment. 



CryptorrJiynclius lapathi, L., de Wilgen- en Elzensnuittor. [C. lapathi, 

 the Willow and Alder Weevil.] — Plantenziektenk. Dienst, Wagen- 

 ingen, Vlugschr. 33, I\Iarch 1921, 3 pp., 1 fig. [Received 3rd 

 August 1921.] 



]\Iuch injury is done to willows and alders, and sometimes to poplars, 

 by Cryptorrhynchus lapathi, L. One case of infestation in birch was 

 obser\'ed. After hibernating, the weevils mate in May. 0\-iposition 

 continues up to August, the eggs hatching in the following March. 

 The larvae become mature by the end of July and the pupal stage, 

 which lasts about 14 days, is passed in the mine. The adults emerge 

 in August. The only reliable remedy against the larvae is to collect 

 and burn all infested twigs, which in July are recognisable by the 

 debris from the borings. The adults may be caught in May b}' shaking 

 them into a tray smeared with tar. As alders are preferred to willows, 

 a few may be planted among the latter so as to attract the wee\'ils. 



Wilgenhaantjes. [Willow Beetles.] — Plantenziektenk. Dienst, Wagen- 

 ingen, \'lugschr. 34, March 1921, 3 pp., 1 fig. [Received 3rd 

 August 1921.] 



The Chrysomelids, Phyllodecta viilgatissinia, L., and P. vitellinae, L., 

 are sometimes abundant on willows. Of other species Galeruca 

 capreae is the most important. The hibernated beetles mate in 



