204 



heaps of weeds, or rubbish, and appears with the first warm days of 

 spring. In the extreme south the beetles are active throughout the 

 year, but reproduction does not occur in winter. In the laboratory 

 both eggs and larvae seemed so susceptible to excessive moisture that 

 irrigation may prove useful against them and also against the pupae 

 in the field. 



This pest is singularly free from natural enemies ; these include 

 birds, a Braconid parasite, Perilitus epitricis, Vier., and Nematodes 

 that infest the adult beetles. 



Numerous experiments were made with various sprays and other 

 remedies. Crops may be protected by spraying with lead arsenate, 

 applied at the rate of 2 lb. powder to 50 U.S. gals, water, or by 

 Bordeaux mixture, 4-4-50 formula, these sprays acting as repellents. 

 Nicotine sulphate, half-pint 40 per cent, solution in 50 gals, water 

 with 2 lb. soap added, or tobacco dust, may be used as deterrents. 

 It is not possible, however, to control this pest when it appears in 

 its greatest abundance. It is desirable to keep the plants thrifty 

 and well-watered ; mechanical traps and trap-crops can be used 

 with advantage. Clean culture is always advisable, especially the 

 destruction of weeds in and near cultivated fields. 



Kalmbach (E. R.). The Crow in its Relation to Agriculture. — U.S. 



Dept. Agric. Washington, D.C., Farmers' Bull. 1102, August 1920, 



20 pp., 4 figs. [Received 22nd February 1921.] 

 The distribution, abundance, life-history, and food habits of the 

 common crow {Corvtis brachyrhynchos) are dealt with, and methods 

 for protecting crops and poultry are described. The merits and 

 demerits of this bird are considered to be about equally divided. 

 Insects supply about one-fifth of its food. Comprehensive information 

 regarding this portion of its diet has been given already [R. A.E.,K, 

 vii, 202]. 



Carpenter (C. W.). Potato Diseases in Hawaii and their Control.— 



Hawaii Agric. Expt. Sta., Honolulu, Bull. 45, 24th January 

 1920, 42 pp., 14 plates, 7 figs. [Received 22nd February 1921.] 



The insect pests dealt with in this bulletin are Phthorimaea 

 opercidella (potato-tuber moth), cutworms, army worms, mites and 

 Nematodes, against which general remedial measures are advocated. 



Carpenter (C. W.). Report of the Division of Plant Pathology. — 



Kept. Hawaii Agric. Expt. Sta. 1919, Honolulu, 10th September 

 1920, pp. 49-54, 2 plates. [Received 22nd February 1921.] 



The mite previously recorded on potatoes and tomatos [R.A.E, 

 A, vii, 196] has been found also affecting sweet peppers in Hawaii. 

 Spraying with sulphur or lime-sulphur proved an efficient remedial 

 measure. 



Conradi (A. F.). Report of the Entomology Division. — 32nd Ann. 



Kept. South Carolina Expt. Sta., 1918-19, Clemson College, 5.C., 



December 1919, pp. 41-44. [Received 23rd February 1921.] 



The principal project under investigation during the j^ear ended 



30th June 1919 was the relation of temperature and moisture to insect 



activity. Charts covering a period of ten years are now available, 



and the interpretations obtainable have important economic value 



