483 



[Carthartus gemellalus], as well as Angoumois grain moth. [Sitotroga 

 cereaJella]. The usual process of fumigation by carbon bisulphide is 

 recommended. 



Pecan insects include Acrobasis nebuleUa (pecan case-bearer), which 

 is causing more injury than any other species. The total parasitism 

 of 2i7 indi\'iduals was 2-3 per cent., the Hymenopterous parasites 

 including Exochiis apicalis, Cres., and Macrocentrus sp. The spray 

 recommended consists of 1 lb. dry arsenate of lead, 2 lb. lime, 2 lb. 

 fish-oil soap to 50 U.S. gals, water, which should be apphed thoroughly 

 to the under-surface of the leaves only, from about the middle of 

 August to mid-September. Acrobasis hebecella (nut case-bearer) may 

 become a very serious pest of pecan. There are probably three 

 generations ; parasitism seems to amount to about 50 per cent, in the 

 first generation. Enarmonia caryana (shuck worm) is the most wide- 

 spread pecan pest, but is only occasionally numerous enough to be 

 injurious. Hymenopterous parasites include CaUiejihialtes gmpholithae, 

 Cress., Phanerotoma tibialis, Hald., and Microbracon sp. 



Aphids include Monellia coskiUs and an apparently new species of 

 this genus. Hyphanlria cunea (fall web-worm) severely infested nut 

 groves ; careful work during the earlier part of the season would have 

 given almost complete control of this pest by destroying the insects 

 with torches, while they are assembled in the webs, or by spraying 

 with arsenate of lead. 



Velu (H.). Deuxieme Campagne d'Experimentation de la M§thode 

 d'H6relle au Maroc centre Schistocerca peregrina, Oliv. (Mars- 

 Juillet 1916). [Second Experimental Campaign with d'Herelle's 

 Method in Morocco a.ga.inst Schistocerca peregrina, Oliv. (March- 

 July 1916.)]. — Ann. lyisl. Pasteur, Paris, xxxi, no. 6, June 1917, 

 pp.'277-290. [Received 13th August 1917.] 



In recording the investigations made in 1916 with Coccobacillus 

 acridiorum for the control of Schistocerca peregrina in Morocco, certain 

 practical results which might be expected from this mode of destruction 

 were discussed [see this Revieiv, Ser. A, v, p. 99]. The present paper 

 records some useful observations which were made during the course 

 of the investigations. The invading hordes of locusts may be infected 

 by an epizootic of contagious enteritis caused by a Coccobacillus of the 

 same group as the bacillus of d'Herelle ; the gravity of these epizootics 

 is variable, but they prevent the increase of the virulence of d'Herelle's 

 Coccobacillus which has been preserved in vitro. It is thought that 

 this coccobacillary enteritis of locusts is probably of more common 

 occurrence in nature than has been suspected, and may account for 

 the disappearance of the swarms for years at a time. As contamination 

 is almost entirely the result of cannibalism, the epizootics produced 

 by artificial means are proportionately more effectual as the hordes 

 of locusts become denser and caimibalism reaches its maximum. The 

 most favourable time for spraying is the end of the third instar. ^\^len 

 used liberally, the biological method should considerably diminish 

 the importance of locust and cricket attacks, facilitating the 

 mechanical methods of control and reducing expense at the same 

 time. 



(C416) a2 



