ENTOMOLOGY. 593 



A disease of plane trees, J. Beauverie [Compt. Rend. Acad. ScL Paris, 136 

 {1903), No. 25, pp. 1586-15S8). — A description is given of a disease of plane trees 

 caused by Glceosporium nervisequum. This fungus, which is usually supposed to con- 

 fine its attack to the leaves, has been found to infest the extremities of young 

 branches and sometimes even the larger ones and the trunks of the trees. When 

 attacking the stems and branches of the trees the fungus destroys the cambium and 

 j)hloem and survives from year to year as a mycelium in the tissues of the host, 

 ap]H^aring in the spring to spread to other plants. From this form it spreads directly 

 to the leaves, and so severe has been the attack in certain regions that it is feared the 

 I)lanting of plane trees will have to be abandoned. 



The "stagheadedness" of spruce, C. von Tubeuf {Naturiv. Ztschr. Land- u. 

 Forsiw., 1 {1903), No. 1, pp. 1-9, figs. 4)- — An examination was made of some of the 

 causes of the frequent occurrence in spruce and other trees of ' 'stagheadedness, ' ' by 

 which is meant the death of one-third or more of the tops of the trees. This condi- 

 tion is of wide extent and has been attributed to various causes. The author seems 

 inclined to the opinion that the preliminary injury is due to electric discharges 

 through the trees, followed by attacks of bark beetles, fungi, etc. 



The anatomical and pathological structure of stagheaded coniferous trees, 

 C. VON Tubeuf {Naturw. Ztschr. Land- u. Forstw., 1 {1903), Nos. 8, pp. 309-315; 9, pp. 

 367-37^2; 10, pp. 413-416, pis. 2, figs. 7). — The anatomical and pathological structure 

 of larch, spruce, pine, and other coniferous trees, as modified by the disease known 

 as staghead, is described. 



The leaf cast of Pinus cemtora, H. C. Schellenberg {Natww. Ztschr. Land- u. 

 Forstw., 1 {1903), No. 8, pp. 306-309). — A discussion is given of the leaf cast of Pinus 

 cembra, which is attributed to LopJioderminrn pinastri. 



A disease of Phoenix, W. H. Taplin {Amer. Florist, 21 {1903), No. 806, p. 587).— 

 A brief account is given of an attack of palm leaves by the fungus Peronospora 

 phoenixx. This fungus is often found upon a number of species of Phcenix, and 

 renders the leaves unsightly as well as interfering with their functional activity. 

 When specimens are badly affected the author recommends as a means of checking 

 the further spread of the disease burning, or thorough applications of Bordeaux 

 mixture of moderate strength to the mfected foliage. 



ENTOMOLOGY. 



Report of the entomologist, E. D. Sanderson {Delaimre Sta. Rpt. 1902, pp. 109- 

 151, pis. 6, fig. 1) . — Experiments were made with remedies for codling moth. 



Trees in various parts of the State were sprayed with different arsenical insecticides, 

 and the results indicated that arsenate of lead applied at the rate of 1 lb. to 50 gal. of 

 water gave a larger percentage of perfect fruit than the arsenites of lime or soda, or 

 Paris green or green arsenoid. All these arsenicals, with the exception of the arsen- 

 ate of lead, were of about the same value. It was found to be unnecessary to make 

 3 applications provided the first 2 were properly done and the addition of adhesives 

 to the arsenical sprays proved to be of doubtful value. The addition of kerosene to 

 arsenical applications was made without harm to the trees. The benefit from the 

 most successful sj^raying for codling moth was estimated at from 25 to 75 per cent. 



Notes are also given on insect parasites of the codling moth, and on banding trees. 

 About 4 per cent of the larvse were captured by banding. Spraying experiments 

 with various contact insecticides and fumigation with hydrocyanic-acid gas. Aphis 

 Punk, Nikoteen, tobacco leaves, and Nicoticide were made in the control of plant 

 lice, including Aphis porni, A. sorhi, and A.fitchii. The best results were obtained by 

 hydrocyanic-acid gas. The San Jose scale was successfully controlled by the use of 

 the California wash and by summer applications of crude petroleum or kerosene. The 

 kerosene was not as effective as crude jjetroleum. A number of Asiatic ladybird 



