k 



1920] ECONOMIC ZOOLOGY — ENTOMOLOGY. 849 



P. trifoUata nono of the wild relatives growing in citrus districts are susceptible 

 enough to have any bearing on the eradication program. 



Little or no change in susceptibility or resistance to citrus canlvcr was noted 

 among the citrus fruits from that previously reported. All hybrids were 

 attacked by citrus canker in variou.s degrees, and all false hybrids were found 

 extremely susceptible. The authors consider that leaf texture is apparently an 

 important factor in influencing resistance to Pseudomonas citi'i by Its host 

 plants. 



A disease of oil palm, A. Maubi^nc and H. C. Navel (Agron. Colon., 4 

 (1920), No. SO, pp. 187-191, pi. 1). — Oil palm {Elceis guineensis), on St. Thomas 

 and Principe and at points farther south on the West African mainland, is 

 attacked by a fungus said to be Oanodenna applanatum, the habits of which 

 are discussed In this connection. 



Sclerotinia ricini n. sp. parasitic on the castor bean (Ricinus com- 

 munis) , G. H. Godfrey (Phytopathology, 9 (1919), No. 12, pp. 565-567, pis. 2). — 

 A description is given of S. ricini n. sp., which is said to cause a serious disease 

 of the ca.stor bean in extensive plantings in Florida and other southern States. 



*' Crack-neck ": A nonparasitic disease of chrysanthemums, G. H. Chap- 

 man (Phytopathology, 9 (1919), No. 11, pp. 532-534, pl- i).— This term is ap- 

 plied to a trouble occurring on fancy forced chrysanthemums and to a less 

 extent on ordinary potted ones. It is characterized usually by a horizontal 

 rupturing of the stem or neck just below the flower head. Occasionally a 

 longitudinal splitting occurs, but this condition is rather infrequent. The con- 

 dition capable of producing cracking of the necks appears to be related to tem- 

 perature and moisture, and it is suggested that the night temperatures be raised 

 as much as po.ssible consistent with the best development of the plants, and 

 that during dull weather water be withheld as much as possible. 



Frost necrosis of tulip leaves, L. R. Jones and M. Miller (Phytopathology, 

 9 (1919), No. 10, pp. Jf75, ^76, fig. 1). — A description is given of injury to Dar- 

 win tulips attributed to frost. The injury is characterized by the appearance 

 of small spots on or between the veins, the lesions resembling those due to 

 bacteria. No evidence of bacterial invasion, however, was found, and it is 

 considered that frost was the cause of the trouble. 



A Tnberculariaceae on box, F. Morel^^u (Bui. Trimest. Soc. Mycol. France, 

 35 (1919), No. 1-2, pp. 12-14, flff^- 4)- — Box in the English garden at Chateau 

 Fontainbleau was attacked April, 1915, by a number of parasites, among them 

 Volutella buxi, which is here briefly discussed in this connection. 



The overwintering of Cronartium ribicola on Ribes, M. W. Taylor (Phy- 

 topathology, 9 (1919), No. 12, p. 575). — The author reports inoculations made of 

 Ribes plants with spores taken from the leaves of Ribes nigrum collected on 

 March 25, 1919. After about 12 days uredinia were noted on the inoculated 

 leaves. This seems to confirm the conclusion that C. ribicola may occasionally 

 overwinter on dead currant leaves. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Mammals of Panama, E. A. Goldman (Smithsn. Misc. Collect., 69 (1920), 

 No. 5, pp. 309, pis. 39, figs. 24; rev. in Jour. Mammalogy, 1 (1920), No. 4, pp. 188, 

 189). — This summary of knowledge of the mammal forms of Panama is based 

 mainly upon material gathered by the author, in the course of a biological survey 

 of the Panama Canal Zone in 1911 and 1912 by the U. S. Department of Agri- 

 culture in cooperation with the War Department, working under the auspices 

 of the Smithsonian Institution. 



