154 EXPERIMENT STATION RECORD. [Vol.35 



Insects and diseases affecting pinks and their treatment, J. Lochot {Jardin, 

 29 {1915), Nos. 669, pp. 315, 316; 670, p. 522).— This article, besides mentioning 

 some insect pests of pinks, and nematodes, the control of which requires eradi- 

 cation of the plants attacked, discusses also a rust of pinks due to a Puccinia, 

 which is said to yield to treatment with sulphur sprays, and a browning due to 

 Hehninthosporium echimdatum, for which is prescribed a 2 per cent copper 

 spray with removal of all parts seriously affected. 



Seasonal duration of ascospore expulsion of Endothia parasitica, F. D. 

 Heald and R. A. Studhaltee {Anier. Jour. Bot., 2 {1915), No. 9, pp. 429-U8, 

 ■flgg 6).— Describing the method, plan, and results of attempts to ascertain by 

 means of traps the activity of spore expulsion by E. parasitica, the authors 

 state that the expulsion begins in the spring with the first warm rains. It 

 increases to a maximum under favoring conditions, declining under the lower 

 temperatures of autumn, and ceasing entirely during the cooler portions of the 

 year, even under abundant rainfall. During one-half to two-thirds of the year, 

 there is a copious expulsion with each rain of any consequence, except when 

 the temperature drops below the minimum, which is not far from 50 to 55° F. 



Perithecial pustules of the cliestnut blight fungus show a remarkable power 

 of spore production. This is not exhausted in a single season, being sometimes 

 as marked during the second season as the first. Apparently, also, pustules first 

 producing mature perithecia in the fall may produce spores during the two 

 following seasons. This is due to the fact of successive maturing of asci, suc- 

 cessive maturing of perithecia, and successive maturing of stromata throughout 

 the season. 



A bibliography is appended. 



Report of chestnut blight eradication, A. B. Brooks {Crop Pest Com. W. Va. 

 Bien. Rpt., 1 {1913-lJf), pp. 50-61, figs. 8). — This is a brief account of work done 

 to eradicate the chestnut blight in portions of West "Virginia in 1913-14. 



Fire injury to chestnut trees appears to favor greatly attack by the blight 

 fungus. Experimentation wus begun to determine to what extent the spread 

 of blight can be checked by cutting the diseased trees and leaving them flat 

 on the ground, based upon the observation that the spread from cankers situated 

 low down on trees is slight as compared with that from those situated high up, 

 especially on trees in prominent situations. 



The leaf blotch of horse-chestnut, V. B. Stewart {New York Cornell Sta. 

 Bui. 311 {1916), pp. 411-419, pi. 1, figs. 8).— The author gives a description of 

 the leaf blotch of horse-chestnut and allied species due to the fungus Guignardia 

 (Bsculi. This fungus is said to have caused considerable injury to trees, par- 

 ticularly those in the nursery, through the destruction of the leaf tissue. Ex- 

 periments for the control of the leaf blotch have shown that lime-sulphur 

 solution or Bordeaux mixture can be effectively employed, but considerable 

 difficulty is experienced in their application owing to the dense foliage of the 

 trees. 



In the summer of 1915 an experiment was made on nursery trees for the 

 control of the leaf blotch by dusting a mixture containing 90 parts of finely 

 ground sulphur and 10 parts of powdered arsenate of lead. This treatment 

 was found effective and is preferred, as there is little danger of injuring the 

 foliage by burning. The dust mixture, it is claimed, can be applied more 

 thoroughly and with greater facility than the spraying solutions, but its cost 

 Is somewliat higher than either of the solutions above mentioned. 



Host plants of pink disease in Malaya, A. Sharples {Agr. Bui. Fed. Malay 

 States, S {1915), No. 5, pp. 203, 204).— It is stated that three new hosts are to 

 be added to the list previously published (E. S. R., 33, p. 151). Of these, 

 Tephrosia hookeriami is though to have served as a center of infection in cue 



