459 



Calcium arsenate can also be used in the control of cotton leaf- worm 

 [Alabama argillucea], fall army-worm [Laphygnia fnigiperda], etc. 

 ]^ut if it is desired to use the weevil equipment solely for leaf-worm 

 control, the .expense may be considerably reduced by mixing lime in 

 equal parts with the calcium arsenate and applying the mixture at the 

 rate of four or five pounds an acre. 



Frank (A.). Diseases and Insects Pests of Blackberries, Loganberries 

 and Strawberries. J7//^///. Bull. Western Washington Expt. Sta., 

 Pmjallirp, viii, no. 1, April 1920, pp. 14-16, 2 figs. [Received 24th 

 August 1920.] 



Blackberries and loganberries are attacked by the cane maggot 

 [Phorbia riibivora], the crown borer [Pennisetia 7narginata] and the cane 

 borer [Oberea bimaculata], all of which also infest raspberries [R.A.E., 

 A, viii, 208]. 



Leaf -hoppers, Empoasca mali, cause a great deal of damage to these 

 plants but may be destroyed by spraying with "Black-leaf 40" at 

 the rate of | of a pint to 50 U.S. gals, of water and 1 lb. of soap. This 

 should be applied before the insects develop wings. 



Strawberry pests include : — Aristotelia sp., Philaenus spamariiis, 

 Lachnostema sp.. Nematodes and the root weevils, Otiorrhynchiis 

 ovatas and 0. sulcatus. The grubs of these weevils may be killed by 

 covering the plants with canvas painted with linseed oil or oilcloth. 

 Under this, saucers should be placed at intervals of abont 5 feet and 

 containing about | of an ounce of carbon bisulphide. The edges of 

 the canvas should be covered with soil and the treatment carried out 

 for about 6 hours. 



Cobb (N. A.). A newly discovered Parasitic Nematode {Tylcnchus 

 mahogani, n.sp.) connected with a Disease of the Mahogany Tree. — 



Jl. Parasit., Urbana, vi, no. 4, June 1920, pp. 188-191, 3 figs. 



Tglenchus mahogani, sp. n., here described from Barbados, lives in the 

 tissues of the mahogany tree and causes a disease the seriousness of 

 which is still uncertam. This Nematode greatly resembles T. musicoh, 

 Cobb, and T. cojfeae, Zimm., and the distinguishing characters of these 

 three species are discussed. 



Brues (C, T.). The Selection of Food Plants by Insects, with Special 

 Reference to Lepidopterous Larvae. — American Naturalist, 

 Lancaster, Pa., liv, no. 633, July-August 1920, pp. 313-332. 



The various theories accounting for the association of insects with 

 ■definite plants are discussed. 



Leiby (R. W.). The Spraying of Irish Potatoes. — Bull. North Carolina 

 Dept. Agric, Raleigh, xl, no. 3 (Bull. 254), March 1919. 38 pp., 

 10 figs. [Received 30th August 1920.] 



The results of five years' (1913-1918) experimental treatment to 

 control insects and diseases of the autumn or late potato crop are 

 described in detail. The insects dealt with include the Colorado 

 potato beetle {Leptinotarsa decemlineata, Say), flea-beetles {Epitrix spp.), 

 and the leaf-hojjper {Empoasca mali, Le B). 



