307 



FuLMEK (L.). Zygoptereneier (Odonata) in Birnzweigen. [Dragonfly- 

 eggs in pear twigs.] — Centralbl. Bakt., Parasit. u. InfektionskranJc- 

 heiten, lite AhL, Jena, xliv, no. 24-25, 12th January 1916, 

 pp. 702-707, 14 figs. [Received 19th May 1916.] 

 In April 1915 the Plant Protection Station in Vienna received from 

 South Tyrol a number of pear twigs, the green bark of which was 

 covered with swelhngs on both sides of a wound caused by the 

 oviposition of an insect, which was found to be a dragonfly belonging 

 to the sub-family Agrioninae. The economic importance of the 

 injury was not ascertained, as the eggs only were observed in the bark. 

 As the further development of these insects takes place in the water, 

 later damage to the twigs is not probable, though indirect injury, such 

 as fungus attack, may arise. 



De Spruitvreter of Knopworm der Bessenstruiken {Incurvarm 

 capitella, Fabr. [The shoot -eater or bud worm of currant bushes 

 {Incurvaria capitella, Fahr.).]— Med. Phytopath. Dienst., Wage- 

 ningen, no. 1, March 1916, 14 pp., 2 plates, 1 map. 

 This bulletin embodies the information contained in a paper already 

 abstracted [see this Revieiv, Ser. A, iv, pp. 89]. Maps are attached 

 showing the extent of currant cultivation in Holland and the dis- 

 tribution of this pest. 



De "Roode Worm" der Frambozen {Lampronia ruhiella, Bjerk.). 

 [The "Red worm" of raspberries, Incurvaria {Limpronia) 

 ruhiella, Bjerk]. — Med. Phytopath. Dienst, Wageningen, no. 2, 

 March 1916, 14 pp., 2 plates, 1 map. 



This bulletin is also based on a former paper [see this Revieiv, Ser. A, 

 iii, p. 643] and is arranged on the same plan as the above w^ith a similar 

 map. 



Battail (J.). Des Causes qui influent sur la Nocivit6 des Arsenicaux 

 employes en Agriculture. [On the causes which afl ect the toxicity 

 of arsenicals emploved in Agriculture.] — Progres Agric. Vitic., 

 Montpellier, Ixv, (33rd year), no. 19, 7th May 1916, pp. 448-452. 



The insecticidal value of the arsenical salts in general use in 

 agriculture is stated to be proportional to the amount of arsenic they 

 contain. The arsenates may be arranged in descending order as 

 follows : — Lime, 37-9 per cent. ; lead, 16-7 per cent, (lead arsenate 

 stands out of place in the Hst because the metal itself is poisonous) ; 

 sodium, anhydrous, 36 per cent. ; arsenite of copper, 34"5 per cent., 

 and the arsenates of iron and copper, 33'6 per cent, and 32 per cent, 

 respectively. The order of toxicity is however modified by the varying 

 degree of solubihty and the presence of other salts produced in the 

 process of manufacture which act as impurities ; chlorides in any 

 considerable quantity are stated to render the use of these arsenicals 

 dangerous as they greatly increase the liability to scorching. Sodium 

 arsenate is the only one soluble in w^ater ; its action is of short duration 

 and at any strength exceeding 1 per 1,000 it may cause serious scorch- 

 ing ; it is therefore only used as a basis for the preparation of the 



