740 



The cost of the product is only that of the pure metaUic copper it 

 contains, which normally amounts to 33 or 34 per cent. To obtain 

 crystallised copper acetate or neutral acetate of copper, verdigris is 

 treated with vinegar distilled by heat in copper boilers. The solution 

 is then concentrated by evaporation and the crystals are allowed to 

 settle in tanks in which wooden rods have been placed for the purpose 

 of collecting them. 



La' "Diaspis" ricompare? [Is Aulacaspis pentagona reappearing?] — 

 Riv. Agricoltura, Parma, xxi, no. 41, pp. 646-647. 



Aulacaspis pentagona having apparently begun to increase, Prof. 

 Berlese has pointed out that most of the specimens seen are males, 

 and that all the infested branches submitted for examination are 

 thickly covered with lichens, owing to the damp weather at the end of 

 the past spring. The scales are able to shelter and develop under this 

 covering, but they must ultimately expose themselves to the attacks 

 of Prospaltella berlesei, so that no special action is necessary. 



Schneider-Orelli (0.). Zur diesjahrigen Frostspannerbekampfung. 



[The control of Cheiniatobia brumata in the present year.] — ■ 

 Schweiz. Zeitschr. f. Obst- u. Weinbau, Frauenfeld, xxiv, no. 19, 

 8th October 1915, pp. 292-294. 



In 1914, the females of Cheiniatobia brumata ascended the trees 

 between the 21st October to 24th November, as shown by the catches 

 on sticky bands ; no males were taken after 3rd December. On this 

 basis, sticky bands should be applied about 18th October in the present 

 year. 



KiTZEMA Bos (J.). [Ziekten en beschadigingen veroorzaakt door 

 Dieren. [Diseases and damage caused by animals.] — Meded. R. 

 Hoogere Land, Tain en Boschbouwsch.. Wageningen, viii, no. 5, 

 1915, pp. 301-331. 



Nematodes. Tylenchus devastatrix, Kiihn, is reported as damaging 

 rye, oats and hyacinth bulbs ; Heterodera schachtii, Kiihn, attacked 

 beet, oats and in one place wheat ; ApJielenchus ritzema-bosi, Schwarz, 

 was received from London, in the flower buds of chrysanthemums. 

 The buds of Lobelia cardinalis were found to be infested by Ayhelenchus 

 ormerodis, Mar;^. ; this is believed to be the first recorded case of 

 such attack. 



Black currants suffered almost everywhere from mites, Eriopihyes 

 ribis, Nal. At the Station two lots of 25 bushes each were treated, one 

 with California mixture 1 part in 15 of water on 23rd April and 8th May 

 and again on 27tli May and 13tli June with 1 part in 25 of water ; 

 the other was thickly dusted with very fine sulphur, but the results 

 were unsatisfactory in both cases. It is considered far better in 

 planting black currants to take the utmost care to obtain uninfested 

 plants than to attempt to destroy the pest. Heliothrips Iiaemor- 

 rhoidalis, Bouche, was very common in greenhouses, and in those 

 which were heated all the year round, breeding was continuous and 

 on the average a fresh generation occurred every month. 



