413 



should be placed about the stem close to the ground when transplanted. 

 The most successful preventive measure proved to be the use of poison- 

 bait spray for the adult flies. 



Peranahrus scabncollis (coulee cricket), which was a serious pest of 

 wheat in 1916, is dealt with elsewhere [see this Review, Ser. A, v, p. 224]. 



Otiorrhynchus ovatus (strawberry root weevil) threatened to become 

 a serious pest in 1916, and various experiments in soil fumigation 

 resulted in the adoption of carbon bisulphide as the only material of 

 practical value, and this was effective only when applied under a cover 

 of oilcloth or canvas. The value of the strawberry fields treated 

 rendered this method neither prohibitive nor discouraging, and the 

 treatment has already been carried on by several growers on considerable 

 areas. 



Bentley (G. M.). Suggestions for the Control of Injurious Insects 

 and Plant Diseases. — Univ. Tennessee Agric. Expt. Sta., Knoxville, 

 iv, no. 3, Bull. no. 14, September 1915, pp. 110-123, 2 figs. 

 [Received 11th July 1917.] 



This is a revised edition of a bulletin which has previously been 

 abstracted [see this Review, Ser. A, iii, p. 549]. 



Bentley (G. M.). Sodium Cyanide as a Fumigant.— Tenriessee State 

 Bd. Entoni., Knoxville, v, no. 3, Bull. no. 18, September 1916, 

 12 pp., 6 figs. [Received 11th July 1917.] 



This paper gives detailed directions for fumigation %vith hydrocyanic 

 acid gas by means of a fumigating box or house, the construction of 

 both being described. The material chosen for the production of the 

 gas is sodium cyanide, in place of the usual potassium cyanide, which 

 is very little produced outside Germany and has consequently risen 

 enormously in price since the war. Sodium cyanide is found to be in 

 every way as successful as potassium cyanide, and as it combines more 

 slowly with the sulphuric acid, greater safety in manipulation results 

 for the operator. All nursery stock passing into or out of the State of 

 Tennessee requires fumigation by law. 



Paddock (F. B.). Sprays and Spraying. — Texas Agric. Expt. Sta., 

 College Station, Bull, no, 187, March 1916, 36 pp., 8 figs. [Received 

 nth' July 1917.] 



This paper gives a useful summary of the various methods employed 

 by growers of crops to eradicate insect pests. Insecticides are dis- 

 cussed under the headings of liquid and dry poisons, contact insecti- 

 cides, repellents and fumigants. Spraying machinery of all kinds is 

 described, with directions and cautions in the use of sprays. Many 

 general preventive measures are also discussed. 



Leefmans (S.). Bijdrage tot het Helopeltis-vraagstuk voor de Thee. 



[Contributions to the Question of Helopeltis and Tea.] — Meded. v. 

 h. Proefstation voor Thee, Buitenzorg, no. l, 1916, 214 pp., 

 4 coloured plates, 6 plates, 1 map, 1 diagram. 



An interim report has already been issued [see this Review, Ser. A, v, 

 p. 131] of the investigations on Helopeltis infesting tea in Java, of which 

 the present paper is a complete account. 



