546 EXPERIMENT STATION RECORD. [Vol.41 



in rapid decay. A spotting very similar to that on the fruit has been observed 

 in the gi-een bark of twigs, and a typical leaf spot is frequently associated with 

 the disease. 



A bacterial disease of citrus {Cal. Citrogr., 3 (1918), No. 11, p. 273).— A 

 brief notice of accounts given under the same title by Doidge (E. S. R., 38, 

 pp. 552, 553), also a brief discussion of the cau.se of the di.sease (Bacillus 

 citrimaculans), its mode of attack, the Injury done, and control measures. 



Ustulina zonata on Hevea brasiliensis, A. Shaeples (Ann. Appl. Biol, 4 

 (1918). Xo. k, PP- 153-178, pis. 6, fig. i).— The present contribution deals with 

 dry collar rot of old rubber trees caused by U. zonata, as noted by various 

 authors. A previous account (E. S. R., 37, p. 52), economic in its main bear- 

 ings, Is now followed by an outline of observations made since 1914. 



The disease is found in old plantations throughout Malaya. Connection is 

 thought to exist between U. zonata and attacks on //. hrasiliensis by boring 

 beetles on trees scorched by forest fires or injured during the process of thin- 

 ning or during the removal of trees of other species. Apparently this fungus 

 does not readily attack uninjured rubber trees. 



Treatments recommended fall in three classes, plantations being divided in 

 this connection into those having young trees not thinned out, those being 

 thinned out but with trees not yet 10 years old, and those having trees over 10 

 years old. The measures recommended include sanitation, eradication of jungle 

 roots, and removal of old trees. 



Further study is regarded as necessary on the role played by latex in the 

 metabolism of the tree, and on selection with a view to improving the latex 

 and increasing resistance to attacks by ^7. zonata. 



The European poplar canker in the vicinity of Philadelphia, Pa., J. K. 

 Primm (Jonr. Econ. Ent., 11 (1918), No. 1, pp. 129-133).— In the course of 

 nursery inspection during the summer of 1917 the author found that within 

 a radius of 35 miles of Philadelphia infection of poplars by DothicMza populca 

 had become well estal)lished. Trees of all ages were attacked, though the older 

 trees were more often attacked and suffered more severely, owing possibly to 

 pruning operations. Lombardy poplar (P. nigra ifalica) appeared to be more 

 susceptible to this fungus than other species. Trees on private estates were 

 attacked as well as young trees in nurseries. The only nursery that was en- 

 tirely free from the canker was one that had been sprayed regularly evei-y 

 winter with lime-sulphur. It is thought that omission of the pruning formerly 

 practiced, especially as regards the basal branches, when combined with good 

 drainage will do much to decrease the injury to the poplar trees. 



Daldinia vernicosa, a pyroxylophilous fungus, A. S. Rhoads (Mycologia, 10 

 (1918), No. 6, pp. 277-284, pl- 1, flff- 1).—A study of D. vernicosa on a selected 

 area near State College, Pa., shows this fungus to prefer burnt wood as a sub- 

 stratum. It appears to be confined to dicotyledonous species, attacking sap- 

 lings killed by fire (especially those of hickory) with great vigor. Morphologic- 

 ally distinct from this species is D. concentrica, said to be the only other species 

 of Daldinia in the United States. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Tropical wild life in British Guiana, W. Beebe, G. I. Hartley, and P. G. 

 Howes (New York: N. Y. Zool. Soc, 1917, vol. 1, pp. 504, Pls. 4, fidS. HO).— 

 Much of this work relates to ornithological observations by W. Beebe and G. I. 

 Hartley, while part 3 (pp. 371-450) deals with entomological investigations by 

 P.,Gr. Howes in which a number of insects of economic imiwrtance ai*e included. 



