485 



Reh (L.). Konnen wir Insektenschaden voraussagen ? [Can we 

 predict Injury by Insects ? J— DtT. prakt. Ratgeber Obst- u. 

 Gartenbau, Frankfort-on-Oder, xxxvi, no. 1, 2nd January 1921, 

 p. 2. [Received 5th x\ugust 1921.] 



It is usually impossible to predict injury by insects. The proper 

 procedure is to assume the probability of an outbreak and take such 

 practical measures as would be required in that case. This is com- 

 paratively easy in the case of annual crops, the clearing of all debris 

 and crop rotation being obvious measures. In the case of trees and 

 bushes all dead wood must be removed in winter, together with the 

 fruits and leaves still present. Loose bark must be removed, and 

 in February the trees should be sprayed with carbolineum. Before the 

 buds open, a 3 per cent, copper-lime spray is advised, with the addition 

 of 80 grammes of Urania green per 100 litres of solution. A -J- per 

 cent, copper-lime spray (also with the addition of Urania green) 

 is then applied when the petals fall. This may be repeated 3-4 weeks 

 later if any pests appear. In alternate years, lime-sulphur should be 

 used instead of the above. For winter treatment 20-40 parts of 

 lime-sulphur per 100 of water may be used before the buds open ; for 

 trees in foliage the strength must be decreased to 2-4 parts per 100. 

 Strawberries in leaf must not be sprayed. 



Reh (L.). Blausaure zur Bekampfung von Ungeziefer. [Hydro- 

 cyanic Acid Gas against Insect Pests.] — Natiivw. Wodienschr., 

 Jena, xxxiii, no. 45. 10th November 1918, pp. 638-642. 

 [Received 5th August 1921.] 



This paper briefly describes the uses and method of application of 

 hydrocyanic acid gas against insect pests. 



Reh (L.). Die wichtigsten Schadlinge des Gemiisebaues und ihre 

 Bekampfung. [The most important Pests of Vegetables and 

 their Control.] — Hamburg, Verlag Edmund Buchner, 1917, 2nd 

 edn., 52 pp., 16 figs., 2 plates. Price 1 Mark. [Received 5th 

 August 1921.] 



This popular handbook on pests of vegetables gives in the case of 

 each species its popular and scientific name, the damage it does, 

 notes on life-history and on preventive and remedial measures. 



The Sale o! Diseased Plants Order oE 1921. — Statutorv Rules and 

 Orders, 1921, no. 930, H.M. Stationerv Office, London. 31st May 

 1921, 3 pp. 



This Order comes into operation on the 1st October 1921 and pro- 

 hibits the sale in England and Wales of any plant attacked by one 

 or more of the following insects : — -Eriophyes ribis, Nal. (black currant 

 mite), Eriosoma lanigerum,\{zx\'s,v[v. (woolly aphis), Coccids, Nygnua 

 phaeorrhoea, Don. (brown tail moth), Stephaniiis {Leptobyrsa) rhodo- 

 dendri, Horv. (rhododendron Tingid) ; or by various fungus and other 

 diseases. 



