381 



Muller-Thurgau (H). Zur Bekampfung des Heu- und Sauerwurms 

 im Sommer. [Notes on combating the first and second Genera- 

 tions of the Vine Moth, Clysia amhiguella, in Summer.] — Schiveiz. 

 Zeitschr. Obst- u. Weinbau, Frauenfeld, xxvii, no. 11, 3rd June 

 1918, pp. 165-170. 



Recent remedial measures against Clysia amhiguella, Hbn.. are 

 discussed. The use of arsenicals is deprecated in favour of nicotine 

 spravs, which must be applied at high pressure, economy in fluid 

 being effected by cutting off the jet when it is not actually aimed at 

 the grape clusters. For the first generation spraying must be done 

 about 10 days after the first large flight, and if the latter be prolonged 

 owing to unfavourable weather, a second application must be made 

 8-10 days later. Spraying against the second generation should 

 take place about 8 days after the chief flight. The solution should 

 contain a minimum of 1*3 per thousand of nicotine, and though the 

 addition of 1 per cent, soap may permit a less amount to be used, 

 such a reduction is not advised. Bordeaux mixture may be used 

 as a carrier instead of plain water. 



Jegen (G.). Die rote Spinne. [Red Spider.]— iSc/^wetz, Zeitschr. 

 Obst- u. Weinbau, Frauenfeld, xxvii, no. 12. 15th. June 1918, 

 pp. 177-182, 1 fig. 



Investigations at the Experiment Institute at Wadenswil have shown 

 that soft-soap solution, soft-soap and nicotine, and a mixture of soft- 

 soap and quassia solutions, are the best sprays against Tetranychus. 

 The plain soft-soap solution at 4 per cent, strength is preferred and 

 camiot damage the trees if aj^plied before the buds open ; a 3 per 

 cent, solution is almost as efficacious, A spray containing equal 

 parts of 1 per cent, soft-soap and 3 per cent, nicotine solutions kills 

 all the eggs, while nearly all are destroyed by a mixture of equal 

 parts of 1 per cent, soft soap and 2 per cent, quassia solutions. 



Bedingungen fur die staatliche Unterstutzung der Versuche zur 

 Belcampfung des Heu- u. Sauerwurms. [Conditions of the State 

 Grant in Aid of Experiments in checking the first and second 

 Generations of Clysia anibiguella.] — Schweiz. Zeitschr. Obst- u. 

 Weinbau, Frauenfeld, xxvii, no. 12, 15th June 1918, p. 184. 



A State subvention of from 20 to 50 per cent, of the cost Is 

 granted by the Zurich Council for experiments with nicotine sprays 

 and trap-lamps against the vine moth, Clysia amhiguella,, Hbn. 

 Whichever method is used, the area must be a large one, extending 

 over the vineyards of several neighbouring growers and the number 

 of lamps, etc., must be in accordance with the requirements of the 

 local authority concerned. In the case of lamps the catches must 

 he carefully counted and reported to the Experiment Institute at 

 Wadenswil. 



Lyle (G. T.). Contributions to our Knowledge of the British 

 Braconidae, no. 3, Microgasteridae. — Entomologist, London, 

 U, nos. 660-661, May-June 1918, pp. 104-111 & 129-137. 

 The species dealt with include : — Diolcogaster margvnatus, Nees, 



the only bred specimen of which was obtained from a caterpillar of 



