537 



LicHTENSTEiN (J. L.). Lc Doiyphore ou Chrysomele de la Pomme de 

 Terre {Leptinotarsa deccmlineata, Say.) — Progyes Agric. & Vitic, 

 Montpellier, Ixxviii, nos. 33 & 34, 13th & 20th August 1922, 

 pp. 158-163 & 183-189. 



In view of the appearance of Leptinotarsa decemlineata, Say (Colorado 

 potato beetle) in the south-west of France, an account is given of this 

 pest as occurring in the United States, from which it has evidently 

 been introduced. The remedies in use in America are quoted, but it is 

 pointed out that in Europe, where the beetle is not indigenous, the 

 campaign against it must be on different lines, and the preliminary 

 legislative measures that have been taken to stamp out the infestation 

 and prevent its spread are outlined [cf. R.A.E., A, x, 536]. 



Paillot (A.). La Fausse Chenille du Pecher. — Rev. Hortic. Algerie, 

 Algiers, xxvi, no. 6, June- July 1922, pp. 110-112. 



The peach orchards in the Rhone Valley are being very badly damaged 

 by a sawfly, Neurotoma (Lyda) nemoralis. This pest has not hitherto 

 been noticed in that region, but it is present to an extent that will be 

 disastrous if the infestation is allowed to spread. Cherries, apricots 

 and almonds are also attacked. The adults began to fly about 

 9th May in 1921, the maximum flight being on the 11th. Pairing 

 and oviposition began soon afterwards, the females depositing an 

 average of 60-70 eggs each in masses on the lower surface of the 

 tender leaves at the tips of the branches. The larvae hatch in 6-8 

 days and feed upon the leaves, after having folded them over with a 

 silken thread. After feeding for about a fortnight they enter the ground 

 for pupation, remaining in the pupal cells through the winter. Neither 

 heat, cold, nor drought seems to have any effect on the vitality of the 

 larvae. 



The only treatment found to be effective was spraying with nicotine 

 or quassia. For the former, 20 lb. of black soap should be dissolved in 

 10 or 12 gallons of boiling water and allowed to cool, \\ gals, of nicotine 

 titrated at about 10 per cent., or one-fifth of that quantity titrated at 

 about 50 per cent., should then be added and the whole brought to 100 

 gals. For the latter, a decoction should be made of 10 lb. quassia chips 

 in about 10 gals, of water ; this should be kept hot for two hours and 

 then allowed to cool ; in a few gallons of water, 20 lb. of black soap 

 should be dissolved, and the quassia decoction should then be added to 

 this and 'the whole brought to 100 gals. The first application of either 

 spray should be made when oviposition is noticed, followed by another 

 application about four days later if the eggs are very numerous. A 

 knapsack sprayer should be used, the lower surface of each leaf being 

 thoroughly wetted. 



ScH. Br. ReblausbekampJung und Rekonstruktion im Kanton Waadt. 



[Vine Louse Control and Vine Replanting in the Canton of Vaud.] — 

 Schweiz. Zeitschr. Obst- u. Weinbau, Frauenfeld, xxxi, no. 17, 

 26th August 1922, pp. 265-267. 



The vineyard area in the Swiss Canton of Vaud decreased from about 

 16,550 acres in 1886 to about 10,900 in 1921 as a result of infestation by 

 Phylloxera. The vineyards are now divided into three classes : those in 

 which measures have been abandoned, those in which the infestation is 

 combated after the vintage, and those in which measures are energetically 

 applied immediately a centre of infestation is observed. About 3,160 



(7933) Wt. P.6/200 1500 11/22 Harrow G. 75 



