ECOXOMIC ZOOLOGY ENTOMOLOGY. 245 



France, with suggestions regarding their control, and their presence and th** 

 amount of injury in Australia are indicated. 



A study of plant gTO\rth on ferruginous soils with special reference to 

 the grape and ^rape chlorosis. G. Cokso t.l«fi. R. Stoz. Cldtn. J.j7r. ^;t--. 

 Roma. 2. ser., 4 (1910). pp. 129-1^2). — ^A chemical study of soils on which 

 normal and chlorotic grapes were growing indicate^l that the chlorosis was 

 due primarily to a deficiency of iron but was aggravated by an excessive supply 

 of lime in the soil. esix>cially when the ratio of lime to magnesia was very 

 great. 



Observations on root diseases in the "West Indies. F. TV. SotrxH (Agr, Xews 

 [Barbados']. 10 (1911). yos. 2^9. pp. S66. 367; 250, pp. S&2. SSS).— The author 

 describes 3 forms of root disease, 2 of which are found on lime trees, while a 

 third occurs on limes, cacao, and other plants of economic imix»rfance. 



The black root disease, which is the one rejxirted as oc-curriug on other plants 

 in addition to limes, is quite destructive. The first symptoms of infection may 

 be noted in a thinning of the foliage. When such plants are examined the 

 collar and the roots show the presence of a dark olive-green mycelium possess- 

 ing a gray border along its advancing edge. Beneath this the bark is usually 

 destroyed. The mycelitmi of this fiuigus. which is a sjvcies of Eosellinia, 

 s^ireads rather rapidly and in addition to the fungnis being propagated by 

 means of spores, it spreads through the extension of the mycelium trader- 

 ground. For its control the author recommends the digging out and burning 

 of infected trees and the treating of the soil with sulphate of iron. 



The second disease is describe*^! as the red rixu of lime trees, which is due 

 to a species of Sph;vrostilbe. Trees attacketl by this disease lose some of their 

 leaves, and the tips of the branches turn yellow and eventually wilt and die. 

 On examination the bark is found brown in color, soft, and rotten, and on the 

 ends of the main roots around the collar, and in some cases on the stem, a 

 smooth, reddish-brown sheet of fungus is present beneath the bark. This dis- 

 ease can be controlled by the s;ime methods recommendevl for the black root rot. 



The third disease is called stem ctinker. although it is primarily a root disease. 

 The symptoms are somewhat similar to those describetl for the other diseases, 

 but the rtx>ts show the presence of peculiar open splits in the bark, which are 

 bordered by a vigorous development of callus. The catise of this disease 

 appears to be physiological, and is attributed to heavy clay soils ditficult to 

 drain. For its control it is recommended that better drainage be provided and 

 that wind-breaks should be erected around the plantations. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Game laws for 1911. H. Oldys. C. E. Brewsteb. and F. L. E.\kxshaw (T. 8. 

 Dci>t. Apr., Farmers' BnJ. -i70, pp. 52. figs. 2). — This bulletin, which presents a 

 summary of the game laws for 1911. relating to seasons, shipments, sale, limits, 

 and licenses, is similar in scoiv to those issued annually since 1JX^2 and includes 

 changes in the laws made during the present year. In the se^'tion relating to 

 legislation of the yenr a brief comprehensive review is given of the now laws. 



Bubonic plague, with special reference to that of ground squirrel origin, 

 G. W. McCoy (Jour. Amcr. Med. Assoc. 57 (1911). Xo. hi. pp. 12tiS-l270). — ^A 

 I>aix>r presented at the annual meeting of the -\merican Meiiical .\ssi>ciation 

 in June. 1911. 



A monograph of the broad-winged hawk (Buteo platypterus), F. L. Burns 

 (Tr«7.«on. Bui.. 23 (1911). Xo. S-f. pp. 1^3-^20. pis. 10. fig. 1).—A work preivtretl 

 in cooix'ration with more than llX) American ornithologists. A bibliography of 

 the world's literature of the species, cousistiug of 37 ixtges, is included. 



