620 



Pettey (F. W.). Arsenical Spray Experiments for controlling Codling- 

 moth in Pears at Elsenburg. — //. Dept. As,ric. Union S. Africa, 

 Pretoria, v, no. A, October 1922, pp. 360-363. 



Experiments against codling-moth [Cydia pomonella, L.] have been 

 continued [R.A.E., A, x, 7]. It was fomid that trees sprayed with 

 calcium arsenate had from 10 to 33 per cent, more infested fruit than 

 those sprayed with lead arsenate. Tests made during the last two 

 years clearly indicate, in spite of assertions to the contrary by various 

 authors, that neither lime-sulphur nor Bordeaux, when used in com- 

 bination with lead arsenate at the concentration usually advised, 

 destroy the efficiency of lead arsenate in codling-moth control more 

 than from 1 to 5 per cent. Their use is therefore advised, at a minimum 

 concentration of 1 J lb. lead arsenate powder or 2\ lb. paste in 40 gals, 

 of diluted Bordeaux or lime-sulphur. According to the data obtained 

 in 1919-20 [loc. cit.'\ any weaker solution would give less satisfactory 

 results. 



Calcium caseinate, made according to Lovett's formula, by mixing 



1 lb. fine hydrated lime with 5 lb. fine casein, was used in the pro-- 

 portion of ^ lb. of the mixture slowly added to each 40 gals, of diluted 

 lead arsenate, but this spreader seemed to have no influence on the 

 efficiency of the lead arsenate \cf. R.A.E., A, viii, 372]. Investigations 

 on the effect of spreaders will be continued. 



VouKASsoviTCH (P.). Observations sur la Cochylis et I'Eudemis Eaites 

 a Monlon pendant I'hiver 1921-1922. — Rev. Zool. agric. & app., 

 Bordeaux, xi, nos. 4 & 5, April & May 1922, pp. 61-66 & 74-78, 

 2 figs. 



During the observations made in the vicinity of Toulouse in the 

 winter of 1921-22 the majority of the cocoons of the vine moths 

 [Clysia ambiguella, Hb., and Polychrosis hotrana, Schiff.] were found 

 under the bark at the angles formed by the junction of the main 

 branches of the stock with the stem. Although the winter was 

 comparatively mild and dry, about 70 per cent, of the pupae were 

 destroyed by the fungus, Spicaria farinosa var. verticilloides, the total 

 mortality, including that due to other causes, amounting to about 

 96 per cent. These facts confirm the observations made by previous 

 authors that dryness predisposes the pupae to attack by diminishing 

 their powers of resistance. The fungus was easily cultivated on 

 glycerined potatoes in Roux tubes and in nutritive G.S.P. medium 

 (1 per cent, peptone, 5 per cent, saccharose, 3 per cent, glucose and 



2 per cent, gelose) in Petri dishes. At 22°-24° [C] [71 •6°-75-2° F.] 

 the mycelium develops very rapidly, the first fructifications appearing 

 after 72 hours. Development is much slower and more irregular at 

 lower temperatures, and in these cases potatoes are a better medium. 



Feytaud (J.). Repartition geograpliique et climatique de la Cochylis 

 et de I'Eudemis. — Rev. Zool. agric. & app., Bordeaux, xxi, no. 6, 

 June 1922, pp. 85-89. 



^arly records of the occurrence of the vine moth, Polychrosis hotrana, 

 Schiff., show that it has been known in France for 30 years as a local 

 pest of which little notice was taken. Now practically every vineyard 

 in the country is more or less infested with it. In many of them 

 Clysia ambiguella, Hb., already occurred, and it was very noticeable 

 that as the numbers of the former species increased, the latter became 



