609 



Newell (W.) & Berger (E. W.). Insects Injurious to the Principal 



Crops of the South. — Qtrly. Bull. Florida State Plant Bd., 

 Gainesville, vi, no. 4, July 1922, pp. 97-116. 



A brief account is given of the principal insect pests occurring in the 

 Southern States, arranged as far as possible under their respective 

 food-plants, with recommendations for their control. Of these 

 Platyedra [Pectinophora) gossypiella, Saund. (pink bollworm), though 

 not causing appreciable damage at present, is considered to be one of 

 the most serious insect problems of the South and great efforts are 

 being made to eradicate it. The other more important pests are 

 Epilachna corrupta, Muls. (Mexican bean beetle), the eradication of 

 which is considered impossible, and Anthonomus grandis, Boh. (cotton 

 boll-weevil). 



A list is given of many pests the introduction of which into the 

 Southern States must be guarded against. 



Nelson (T. C). The European Pileworm. A Dangerous Marine Borer 



in Barnegat Bay, New Jersey. — New Jersey Depi. Agric. Expt. 

 Sta., New Brunswick, Cut. 139, 1st March 1922, 15 pp., 8 figs. 

 [Received 10th October 1922.] 



Teredo navalis, L. (European pileworm) caused a great deal of damage 

 to piles and other marine structures in San Francisco Bay during 

 1920 and 1921. A heavy infestation by this marine borer was also 

 found at Barnegat Bay, New Jersey, where, as a result of attack, 

 a cypress platform collapsed. An account is given of this pest, its 

 habits, the injury caused by it and the resulting danger to all marine 

 structures. 



KoMP (W. H. W.). A Study of the Distribution of Hydrocyanic Acid 



Gas in Greenhouse Fumigation. — New Jersey Agric. Expt. Sta., 

 New Bruns'wick, Bull. 355, 1st September 1921, 22 pp., 15 figs. 

 [Received 10th October 1922.] 



The results of the observations here described have already been 

 noticed from another source [R.A.E., A, viii, 44], The experimental 

 apparatus is described, and the minimum dose of hydrocyanic acid 

 gas required for the destruction of Macrosiphnm rosae was found to 

 he in the neighbourhood of 0-00015 to 0-0002 gramme per htre of air, 

 depending on the temperature. At the higher concentration all Aphids 

 were dead after 15 minutes' exposure at temperatures ranging from 

 40°-100° F. With the lower concentration the same results were 

 obtained only with a temperature of 100° F., or with 80° provided 

 the exposure was continued for 30 minutes. This effect of temperature 

 may explain the high percentage of gas required to produce killing 

 effects in greenhouses, where as a matter of safety for the plants 

 the temperature is kept low during fumigation. 



Headlee (T. J.) . Report of the Department of Entomology, 1920-21.— 



Kept. New Jersey Agric. Expt. Sta., 1920-21, New Brunswick, 

 1922, pp. 351-408, 25 tables, 2 figs. 



During 1920-21 Aphids were more injurious to orchards, although 

 the number of eggs deposited was materially less than in the previous 

 year. The predominant species were Aphis sorbi (rosy aphis) and 



