28 



Rapports sommaires sur les Travaux accomplis dans les Laboratoires 

 et Comptes Rendus des Missions d'Etudes. — A)in. Service dcs 

 Epiphvties, Paris, vi, (1918) 1919, pp. 336-351. [Received 

 12th No\ember 1920.] 



The \voik oi the entomological and j)athological stations at Paris, 

 Bordeaux, Montpellier, Saint-Gcnis-Laval and Cadillac during 1918 is 

 reviewed. Cryplolaemns montrouzieri, the Coccinellid that has been 

 found so efficacious in the control of scale-insects in California [R.A.E., 

 A, vii, 61], has been introduced into France, and is being reared in 

 considerable numbers, chiefly as a check on scales of the genus 

 Psciidococciis {Dacfylopiits). Attempts are also being made to accli- 

 matise a Braconid parasite of the potato moth {Phthorirnaea opi*rculdla) 

 introduced. from California ; this parasite cannot as yet be considered 

 to be established, but conditions appear favourable to it. 



Experiments in fumigation for the control of Stcphanitis rhododendri, 

 which is a serious pest to the horticulturists around Paris, indicate 

 that adult and larval stages of this bug can be completely destroyed, 

 without any injury to rhododendron bushes, by the following procedure. 

 Bushes of approximately 8 cubic metres were covered by a tent 

 measuring 6 square metres and exposed for one hour to hydrocyanic 

 acid gas produced by placing in 22 c.c. of water 11 grammes of 

 sulphuric acid and 7 grammes of cyanide of potassium. The treat- 

 ment was given in the evening at a temperature of about 65° F. 

 Any weaker fumigation than this only gave rise to a comatose 

 condition from which the insects quickly recovered. 



In the course of measures against the oblong scale {Eulecanium 

 pcrsicae), and against Chionaspis citonymi and Pulvinaria floccifera, 

 which are frequently found associated with it, the destructive influence 

 of heat and dryness on scales and certain other insects, particularly 

 Clysia ambigncUa, was apparent. 



Scolytits rugulosiis, Ratz., which is generally known as a pest of 

 apples and has not apparently been previously recorded as occurring in 

 the Rhone valley, has been the cause of the death of a number of 

 apricots. The work of this beetle is frequently mistaken for that of 

 Xyleborus dispar, which, however, was not observed in the region. 

 A Hymenopterous parasite of the larvae has been noticed, and a study 

 of both is being made. 



Observations are recorded on the effect of gases from a powder 

 factor\^ (chiefly nitrogenous) on the neighbouring vegetation. In 

 places where the gases were borne by the wind there was no noxious 

 effect on the crops. On vines, however, that had been sprayed with 

 copper solution, wherever the copper had touched them the vines were 

 scorched and dried. Both flowers and fruit were completely withered 

 in consequence. 



FuLMEK (L.) & Sriii (A.). Ueber im Jahre 1918 erschienene bemerkens- 

 werte Mitteilungen auf dem Gebiete der tierischen und pflanzlichen 

 Feinde der Kartoffelpflanze. jConnuunications of \'alue published 

 in 1918 concerning the Animal and Vegetable Enemies of the 

 Potato.] — Centralbl. Bakt. Parasii. u. Infektionskr., Jena, lite 

 Abt., hi, no. 4-8, 21st October 1920, pp. 81-100. 



This is a comprehensive review of the literature on the subject for 

 1918. 



