1919] DISEASES OF PLANTS. 645 



beetles (Leptinotarsa deicmlinintn) , Ilea beetles (Epitrir cummcrix) , tomato 

 worms (Protoparee oarolina), and plant lice (A phi* pxeudobrustticte). Studies 

 were made of the beetles and tomato worms, whirli show conclusively that 

 the spores of N. linoy* rxii-i and Alt* riuirin xnluni are carried not only on the 

 bodies of insects but in the digestive tracts as well, and that the excreted 

 spores are viable. In connection with the possibility of pickets Ji aoo s a lnatlng 

 the spores, it was found that they carry large numbers of spores on their hands 

 and garments, and on this account it is recommended thai picking should be 

 delayed after a rain or heavy dew until the plants are dry. 



Lightning injury to herbaceous plants, L. It. Jones and W. W« Gii.ukkt 

 {Phytopathology, 8 (1918), No. 6, pp. 270-282, flys. 8).— Following the publica- 

 tion of notes of lightning Injury to various crops (E. S. It., 3S, pp. 149, 260). 

 the authors have collected and compiled data relating to lightning injury to 

 potatoes, cotton, tobacco, cucumbers, and tomatoes. 



Lightning injury to grapevines, L>. Reddick (Phytopathology, 8 (1918), Xo. 

 6, p. 298). — A brief description is given of an unquestioned case of lightning 

 injury to grapevines. 



Lightning injury to citrus trees in Florida, H. E. Stevens (Phytopathology, 

 8 {1918), No. C>. pp. 283-385, fig. 1). — The author describes the injury due to 

 lightning in citrus groves within the State. 



Common diseases of ornamental plants, M. T. Cook (New Jersey Stas. Circ. 

 97 (1918), pp. 23, flys. 10). — Brief discussions are given of the more common dis- 

 eases of ornamental plants, with directions for their treatment. 



Common diseases of shade and ornamental trees, M. T. Cook (New Jer8< y 

 Sta.s. Circ. 98 (1918), pp 3-27, figs. 11).— After a brief discussion of the care of 

 shade and ornamental trees, the more common diseases to which the roots, 

 stems, and foliage are subject are described and suggestions are given for 

 their control so far as definite means are known. 



Exclusion legislation and fruit tree production, V. B. Stewast (Phyto- 

 pathology, 8 (1918), No. 7, pp. 360-36.'i). — The author calls attention to some of 

 the objections to proposed legislation and regulations for the importation of 

 nursery stock. 



Notes on Peridermiums from Ohio, It. G. Pierce (Phytopathology, 8 (1918), 

 No. 6, pp. 292-294). — Attention is called to the occurrence of P. carncum on 

 the Austrian, Corsican, and western yellow pine and on pitch pine, and to the 

 desirability of nurserymen seeing to it that alternate host plants of this and 

 other species are removed from the vicinity of forest nurseries. 



Host relationships of the North American rusts, other than Gymnospo- 

 rangiums, which attack conifers, A. S. Rhoads, G. G. Hedgoock, E. Bethel, 

 and C. Hartley (Phytopathology, 8 (1918), No. 7, pp. 309-352).— The authors 

 have attempted to assemble in concise form all available information on the 

 rusts of conifers other than Gymnosporangiums. In addition a bibliography of 

 148 titles, covering some important publications of North American authors 

 dealing with the description, life history, and genetic relationships of this 

 group of rusts, has been appended. 



Some factors affecting viability of the urediniospores of Cronartium ribi- 

 cola, G. H. Duff (Phytopathology, 8 (1918), No. 6, pp. 289-292. fig. l).—\ series 

 of experiments on the viability of urediniospores of Cronartium under various 

 conditions is reported by the author. The experiments were planned to deter- 

 mine the possibility of the urediniospores passing the winter in a living condi- 

 tion on old leaves ready to cause infection of Kibes In spring, to make a general 

 study of the viability of the urediniospores, and to test the possible toxic 

 action of sunlight upon these spores. 



