1919] ECONOMIC ZOOLOGY- -EBTOMOLOGY. 751 



89 p. 849), Is Bald to exist in (wo forms, each of which lulls the trees with 

 (usually) a Bofl si inking rol in tin' hearl of tin- cabbage, in one type the 

 dropping of the young outs is followed by the breaking down of the limbs, 

 though the bosl may not be killed for some weeks <>r months. In the other type, 

 cow widespread in si. Thomas and Portland where it has gradually Increased 

 since tin 1 hurricane of 1817, the first disease Indication is a drooping of the 

 heart leaf, which soon dries up, the tree being in a dying condition from tho 

 first appearance of the trouble. This type is due in a fungus, the progress of 

 which is described. Destruction of the whole tree by fire as soon as the disease 

 is discovered is recommended, as the Infection is spread by means of wind, 

 Insects, and birds, attacking trees of all ages, bul more particularly those en 

 dee]), rich, alluvial soils in wet districts where rapid growth, sappy weed, and 

 early bearing are more noticeable. 



Diseases of coconuts in Jamaica, W. Xowkit. (Agr. News [Barbados], 11 

 (WIS), No. ',n. pp. .'.sn. ,.'>■? i. -This contains a brief account of the coconut hud 

 rot diseases discussed by Ashby, as above noted, also of leaf bitten phenomena 

 said to exist in four forms. The most frequent of iliese is caused by the pine- 

 apple fungus ( Thielaviopsis paradoxa), the second widely spread hut less fre- 

 quent form by a small yeast, the third by a downy mildew ( Phyt Ophthora sp.), 

 and the fourth by the rhinoceros beetle (Strategus sp.). These forms are 

 briefly described. 



The minimum Bordeaux application for the control of Hemileia, B. M. 

 Africa {Philippine Agr. and Forester, 6 (1918), No. 9, pp. 251-271).— The prin- 

 cipal obstacle to coffee production In the Philippines for some years having 

 been found to he leaf rust (//. vastatrix) an investigation has been made of this 

 disease, the results Of which are tabulated and discussed. 



A stock solution of '■'< : 5: 50 Bordeaux was used ai 25 50, and 75 per cent of 

 its full strength. The 75 per cent solution employed every three weeks gave 

 fair results, as did the 50 per cent strength employed every two weeks. Weaker 

 solutions or longer Intervals gave slight protection and were employed at a 

 loss. It was shown that for the best results sprayin.tr should begin before the 

 Infection is perceptible. Caracolillo coffee on the college farm was infected 

 earlier than was native coffee at San Antonio. A net profit from spraying was 

 obtained on two lots of coffee at Los Bafios. 



The diseases of roses, L. M. Massey (Trans. Mass. Wort. For., 1918. pt. 1, pp. 

 81-101, pit. 2). — This somewhat general account of rose diseases deals also with 

 experimentation on their control. 



Black spot (Diplocarpon rosce) was effectively controlled by the use of Hme- 

 sulphur 1 : 50, Bordeaux mixture 5:5:50, or a dust mixture consisting of 00 

 parts finely ground sulphur and 10 parts lead arsenate, the last mentioned being 

 preferred on account of its ease of application and of its causing less discolora- 

 tion than the others. In connection with powdery mildew (Sphcerotheca pon- 

 nosa), the dust mixture proved superior in fungicidal value and less objection- 

 able as regards the resulting appearance of the plants than Bordeaux mixture 

 or lime-sulphur. Crown canker ( Cylindrocladium scoparium) is said to be 

 under experimentation as regards proper control measures. Crown gall (Bac- 

 terium tumefaciens) is said to live for years in soil oiice infected, supposedly 

 attacking the plants as a wound parasite. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Annual report of the governor of Alaska on the Alaska game law, 1918. 

 T. Riggs, jr. (U. S. Drpt. Agr., Bur. Biol. Survey, 1919. pp. *4).— This is the 

 usual annual report on the administration of the Alaska game law, in which 



