690 EXPERIMENT STATION RECORD. 



new I'.'Hvcs arc inatuiv. At tliis time j:;ray or bluish spots appear on the leaf, and by 

 tlie rapid growtli of tlio leaf at these points the surface becomes convex on one side 

 and concave on the other. In some of the narrow-leaved species of oaks the spots 

 become confluent over a larj^e portion of the leaf, so that it is as l)adly curled as in 

 the case of the i)each-leaf curl, which is due to a closely related parasite. By the 

 rapid spread of the disease from li-af to leaf partial or complete defoliation of the tree 

 may occur early in sunnner. This defoliation has a weakening effect upon the tree, 

 and a i-umulative effect may result in the final destruction of the tree. 



The fungus causing the disease has been determined as Taphria ajcrulescais, a 

 description of which is given. The fungus is not perennial within the tissues of the 

 host plant, and experiments with Bordeaux mixture have shown that it can be suc- 

 cessfully combated l)y -5 or 4 sprayings of that fungicide. The applications should 

 be begun early in the season and continued until the leaves have attained their 

 mature size. A list is given of 10 species of oaks w'hich are known to have been 

 infected by this fungus, and the distribution of the parasite throughout the State of 

 Alabama and the United States is indicated. A bibliography of the more important 

 arti(rles relating to the disease concludes the bulletin. 



Dead h.orse-cliestnut trees, M. C. Cooke {Jour. Roy. Hart. Soc. \_Lond(>n'\, 28 

 {1903), No. 1-2, p. XXII). — A brief report is given of the destruction of horse-chest- 

 nut trees, which is believed to be due to Stereum purpiireum, although it does not 

 appear that this species has been hitherto recognized as causing the destruction of 

 forest trees. A related species, S. hirsutum, which is common as a saprophyte, is 

 also known to become parasitic and it is thought probable that the species in ques- 

 tion has the same faculty. 



ENTOMOLOGY. 



The enemies of agriculture, A. L. Herrera {Las jjlagas de la agricidtnra. Mex- 

 ico: M'miderio de Fumento, 1903, pp. 435-626, pis. 9, Jigs. IS). — This is a continuation 

 of the author's general work on the subject of insect pests and fungus diseases (E. S. R., 

 14, p. 467). Notes are presented on the insect pests of beans, peas, and other 

 legumes, and on insects injurious to corn, apples, citrus fruits, olives, pear, pine, and 

 other forest trees, and cultivated plants. A discussion is also presented on mosqui- 

 toes, grasshoppers, the use of parasitic fungi in the destruction of insects, and San 

 Jose scale. 



Entomology and agricultural parasitology, G. Guenaux {Entomologie et par- 

 nsitologie agricoles. Paris: J. B. Bailliere & So7is, 1904, pp. XII-\-5S8, Jigs. 390). — 

 This volume constitutes one of a general series entitled Agricultural Encyclopedia, 

 and edited by G. Wery. The subject-matter includes a description of the various 

 forms of lower animals which are injurious to crops and domesticated animals. The 

 pests discussed in the volume include protozoa, worms, mollusks, myriapods, arach- 

 nids, and insects. The injurious insects are classified according to their systematic 

 position and also according to the crops, animals, or products which they attack. 

 Chapters are also presented on l)eneficial insects and on remedies for controlling 

 injurious species.' 



Report of the chief inspector of nurseries and orchards, A. F. Burgess 

 {('olainhns: Ohio State Bd. Agr., 1902, pp. 34, Jigs. S). — Brief notes on the inspection 

 work of the Ohio State Board of Agriculture during the year 1902, with statistical 

 data concerning the number of trees and amount of nursery stock inspected and the 

 remedies recommended. Brief notes are also given on peach yellows, black knot, 

 cankerworm, gypsy moth, and San Jose scale. A copy is given of the nursery and 

 orchard inspection law of Ohio, together with a list of nurserymen of the State, and 

 an ai)pendix in which remedies for various fungus and insect pests are described. 



Insects injurious and beneficial, E. P. Venables {Rpt. Supt. Farmers' Insts. 

 British Coluiiibia, 4 {1902), pp. 45-48). — During the season of 1902 plant lice, espe- 



