404 



The most important natm-al check to this beetle in Colorado is cold 

 weather. It has not yet become fully adapted to northern chmates, 

 and many eggs, larvae and pupae occur so late in the autumn that 

 they are killed by frost. Predaceous enemies include other Coccinel- 

 lids, such as Hippodamia convergens, DeG., H. qui7i(f(esi(jnata, Kby., 

 and Coccinella transversoguttala, ¥., which destroy the eggs. 



The latest experiments in controlHng E. cor rapt a indicate that 

 preventive measures are the most efficient, consisting of hand-picking 

 and brushing from the plants, clean culture and early and late planting. 

 Arsenicals have some toxic properties, but act chiefly as repellents. 

 Spraying with 1 or 2 lb. lead arsenate powder or 1 to Ij lb. dry zinc 

 arsenite to 50 U.S. gals, of water is recommended, and Bordeaux 

 mixture (4:4; 50) should be used either alone or in combination with 

 these arsenicals. Further tests are required to ascertain the most 

 effective and economical mixture, that will not injure foliage. 



A report on the occurrence of E. corrapta in Colorado in 1919, by 

 A. E. Mallory, is appended. 



Fryer (P. J.). Insect Pests and Fungus Diseases of Fruit and Hops. 



— Cambridge, University Press, 1920, xv -|- 728 pp., 305 figs., 

 24 plates. Price 455, net. 



This is a book of reference suited to the requirements of the fruit 

 and hop grower. The chief characteristics of the structure and hfe 

 of insects and plants are given, and the insect pests that attack fruit 

 and hops are described in detail, the information being given concisely, 

 and tabulated where possible. Beneficial insects are noticed, and a 

 full description of practical insecticide materials is given. Fungi and 

 the diseases they cause are dealt with on the same lines. 



An account is given of spraying and spraying machinery of all kinds, 

 with a calendar of work to be done throughout the year. Owing 

 to the method of tubulating information, with references to other parts 

 of the book where necessary, any particular detail required on a subject 

 is readily ascertained, and a large amount of matter is contained in 

 the space available. An adequate index is appended. 



Smith (K, M,). The Injurious Apple Capsid [Plesiocoris rugicollis, 

 Fall.) — Jl. Ministry Agric, London, xxvii, no. 4, July 1920, pp. 

 379-381. 



Some of the information contained in this paper has already been 

 noticed [R.A.E., A, vi, 278]. Plesiocoris rugicollis seems to have 

 increased greatly of late years, and has caused serious loss to apple I 

 growers. 



It produces stunting of the leaves and shoots, serious malformation 

 of the fruit and, after a consecutive attack for several years, stunting i 

 of the tree itself. The damage is caused by the action of some sub- 

 stance in the salivary juices peculiar to this species among those bugs ,^ 

 normally feeding on apple. It is pointed out that there is a possibility ' 

 that other Capsids causing similar injury, such as Lygus pabulinus, 

 which normally feeds upon herbaceous plants, may suddenly adopt a 

 taste for fruit trees. 



Spraying is useful as a remedial measure, but it is necessary to wet j 

 each individual with the fluid, as if only a few escape, they are capable ' 



