492 



As the Ericaceae are poisonous to most possi])le pests, those that 

 infest theni belong to only a few genera ; and these genera have been 

 able to give rise to different species for each species of food-plant. 



GAK^rAN (P.). The Relation of certain Greenhouse Pests to the Trans- 

 mission of a Geranium Leaf Spot. — Maryland Agric. Expt. Sta., 

 College Park, Bull. 239, October 1920. pp. 57-80, 7 figs. [Received 

 10th August 1921.] 



The leaf -spot disease of geraniums dealt with is caused in part by the 

 fungus Cercospora brunkii. The most important arthropods associated 

 with the disease are the mites, Tarsonemits pallidus and red spider 

 [Teiranychus], and a whitefly, but experiments prove them incapable 

 of transmitting it. Infection is probably carried by watering. 

 Suggestions are made for the control of the fungus. 



DucKETT (A. B.). Annotated List of Haiticini. — Maryland Agric. 

 Expt. Sta., College Park, Bull. 241, December 1920, pp. 111-155. 

 [Received 10th August 1921.] 



This paper is published posthumously, and for the purpose of 

 condensation, the introduction and arrangement of the text have been 

 considerably changed by E. N. Cory. The keys to the College Park 

 genera and species of these flea-beetles are based on the works of 

 Blatchley, Horn and Crotch. In all, 75 species are dealt with, of 

 which a great many are of economic importance. 



Dudley (J. E., Jr.), U.S. Bur. Ent., & Wilson (H. F.). Combat 

 Potato Leafhopper with Bordeaux. — Wisconsin Agric. Expt. Sta., 

 Madison, Bull. 334, July 1921, 31 pp., 17 figs. 



The seasonal history of Empoasca mali (potato leaf-hopper) is 

 described \R.A.E., A, vi, 207], and the method of dealing with it by 

 means of Bordeaux mixture is discussed [R.A.E., A, ix, 31]. 



Lucerne Flea. — ]l. Dept. Agric. South Australia, Adelaide, xxiv, 

 no. 11, June 1921, p. 893. 



The most effective method of keeping the lucerne flea [Smynthurus 

 viridis] in check is to allow sheep to graze very closely, after which the 

 plot should be cultivated and harrowed. The effect of this method 

 is increased if the land is wet while the sheep are on it, and if the 

 flock is large enough to clear the plot quickly. The only effective 

 insecticide is gas-lime, which requires very careful application to 

 prevent injury to plants and even then is less efficacious than the 

 rapid feeding of sheep followed by cultivation. 



Bern.\rd (C). Verslag van het Algemeen Proefstation voor Thee 

 over het Jaar 1920. [Report of the General Tea Experiment 

 Station for 1920.] — Meded. Proefst. voor Thee, Btiitenzorg, no. 74, 

 1921, 64 pp. [Received 10th August 1921.] 



The tea pests reported included Helopeltis, Pachypeltis, the cater- 

 pillars of Setora nitens and Thosea cervina, Zenzera coffeae (coffee- 

 borer), leaf-rollers, Andraca bipnnctata (bunch caterpillar), mites, 

 Poccilocoris hardwicki (tea-seed bug), the tea-seed fly {Adrama 

 dcterminaia) and Nematodes. 



