l^ 



364 



machinery, size of tree, weather conditions, kind and cost of insecti- 

 cides, etc. Nymphs and adults of both species seemed about equally 

 susceptible to either dusting or spraying mixtures. The two essential 

 factors for successful treatment are materials with adequate insecticidal 

 properties and contact of the material with the insects. 



Temperatures ranging from 44 to 87° F. and moisture on foliage 

 apparently had no influence on the toxic properties of dusting mixtures. 

 The dosage cost for dusting is higher than for spraying, owing chiefly 

 to the high nicotine content of the dust mixtures. Dusting, however, 

 is economical in time and labour. For the average grower, and with 

 the prevailing prices of material and labour, the apple red-bugs can 

 be more efficiently and economically dealt with by spraying than by 

 dusting. In large commercial orchards dusting is of great advantage 

 as a supplement to the usual spraying operations. Derris and tobacco 

 dust, either alone or with soap or lime-sulphur solution, showed a 

 high degree of toxicit}^ There is great need for discovery of effective 

 and less expensive dusting materials as contact insecticides for these 

 bugs. 



A shorter account of these dusting experiments and the results 

 obtained, written by J. D. Luckett, is given in a popular edition of 

 this bulletin. ' 



COMSTOCK (J. A.). A Giant Palm-boring Beetle — Dinapate wrightii. 

 — Bull. Southern Calif. Acad. Sci., Los Angeles, xxi, pt. 1, 

 March 1922, pp. 5-17, 2 plates. 



The main points of interest in connection with Dinapate wrightii, 

 Horn, are given, the information being taken from various technical 

 and general papers. 



So far as known, this Bostrychid occurs only in the canyons 

 debouching into the Coachella valley, California, where the palm,* 

 N eoivashingtonia filifera, grows. 



Ruby (J). La Lutte centre les Sauterelles dans les Bouches-du- 

 Rhone. — Vie Agric. et Rur., Paris, xx, no. 17, 29th April 1922, 

 p. 292. 



The methods used in the recent campaigns against locusts in the 

 Bouches-du-Rhone district are described [R.A.E., A, x, 23, etc.]. 



La Pirala o Gusano de las Manzanas (Carpocapsa pomonella). — Gaceta 

 Rural, Buenos Aires, xv, no. 176, March 1922, pp. 919-923, 

 6 figs. 



The life-history and habits of Cydia {Carpocapsa) pomonella, L., 

 as occurring on apples are described, and the usual arsenical spraj's 

 are suggested as remedies. 



DiFFLOTH (P.). Les Ennemis de la Vigne.-^ Vie Agric. et Rur., Paris, 

 XX, no. 18, 6th May 1922, pp. 315-319, 5 figs. 



This paper summarises information from various sources regarding 

 the commoner insect pests of the vine. 



ENiEYS (P.). Observations biologiques sur les Habrobraeons. — 

 C.R. Soc. Biol, Paris, Ixxxvi, no. 15, 29th April 1922, pp. 829- 

 831. 



The author records further observations following upon the 

 discoveries of Trouvelot regarding the feeding habit of Habrobracon 



