244 



Rankin (W. H.), Hockey (J. F.) & McCurry (J. B.). Leaf Curl 

 and Mosaic of the Cultivated Red Raspberry. — Phytopathology, 

 Lancaster, Pa., xii, no. 1, January 1922, p. 58. 



Aphis ntbiphila. Patch, has been proved to be the transmitting^ 

 agent of leaf-curl and mosaic disease of raspberry in Ontario, though 

 no causal organism for either disease has been found. Roguing in 

 August is advocated as a means of control. The entire root of the 

 canes should be removed immediately to prevent the migration of 

 Aphids to healthy ones. 



Eyer (J. R.). Preliminary Note on the Etiology of Potato Tip-burn. 



— Science, Garrison-on- Hudson, N.Y., N.S., Iv, no. 1416, 17th 

 February 1922, pp. 180-181. 



Tip-burn of potatoes may be produced by the extract made from 

 macerated nymphs or adults of Empoasca mali, Le B., and is trans- 

 missible by direct inoculation. The active principle is most virulent 

 in the nymphal stage of the leaf-hopper. The virus is present in diseased 

 leaf tissue after infection and may be transmitted to healthy plants 

 by reinoculation. The disease cannot be simulated by inoculation 

 of extracts or by feeding of insects other than E. mail or by mechanical 

 injury. Although sunlight is an important factor in the progress 

 of the disease, its absence does not prevent occurrence. 



Weiss (H. B.) & West (E.). Additional Notes on Fungous Insects.^ 

 Proc. Biol. Soc. Washington, D.C., xxxix, no. 34, 21st December 

 1921, pp. 167-172, 1 plate. 



A further list is given of insects feeding on fvxngi, arranged according 

 to families, and previous records are reviewed [cf. R. A.E., A, ix, 199]. 



Headlee (T. J.). Report of the Department of Entomology, 1919-20. 



— Rept. New Jersey Agric. Expt. Sta., 1919-20, New Brunswick, 

 N.J., 1921, pp. 415-505, 20 tables, 4 figs., 4 plates. [Received 

 9th March 1922.] 



During 1919-20 Aphids were not only far less abundant in orchards, 

 but the predominant species, the oat aphis [Siphonaphis padi], was 

 the least injurious. During 1919 the green apple aphis [Aphis pomi] 

 reappeared in considerable numbers during the latter part of the 

 summer, and it is thought that the low temperatures reacted un- 

 favourably on its natural enemies, thus accounting for the outbreak. 

 The serious injury caused by the pink and green potato aphis 

 [Macrosiphum solanifolii] in 1918 was repeated. The green clover- 

 worm [Plathypena scabra] was abundant on all kinds of beans. 

 Damage was promptly checked with powdered lead arsenate and lime- 

 sulphur (1 : 5) . Lead arsenate in Bordeaux mixture or water to which 

 twice the amount of fresh slaked lime had been added was also effective. 

 When applied as a dust the plants must be thoroughly coated, using 

 at least 30 lb. to the acre, and when applied as a spray 6 lb. of powdered 

 lead arsenate should be used to the acre. Paris green and lime or 

 calcium arsenate and lime scorch the foliage. The main point in the 

 control of plum curculio [Conotrachelus nenuphar] lies in making a 

 sufficient number of careful sprayings to maintain the coating of 

 the fruit throughout the period covered by its injury, which usually 

 lasts for about four weeks from the falhftg of the blossoms. 



