April, 1920] PATHOLOGY [69 



1166. Coons, G. H. Notes on Michigan plant diseases in 1916. Rept. Michigan Bl 

 Bd. Agric. 1917: 310-317. 1917 (1918). 



1167. Coons, G. H. Oat smut. Rept. Michigan State Bd. Agric. 1917: | 1017 

 (1918). — Popular presentation of the facts concerning oat smut. — 0. II. I'uonn. 



$? 1168. Coons, G. H. The relation of weather to epidemics of late blight of potato. Kept. 

 Michigan State Bd. Agric. 1917: 317-318. 1917 (1918).— Rainfall condition* in tfa alf 



of the growing season influence severity of late blight of potatoes, caused by Pkytophlhora 

 infestans, and from this arises the possibility of predicting when epiphytntics threaten. — 

 O. H. Coons. 



1169. Dutton, W. C. Dusting and spraying experiments with apples. Michigan Agric. 

 Exp. Sta. Special Bull. 87. 24 p. Fig. 1-6. 1918. — Reports three years' experience in spray- 

 ing and dusting apples to control apple scab ( Venturia inaequalis) with tables on cost of ma- 

 terials and applications. In two years out of three, dusting gave satisfactory scab control, 

 while in the one year dusting failed almost entirely to control apple scab. Standard lime- 

 sulphur solution gave better control than "dry lime-sulphur." An application of fungicide 

 made when the flower buds were "pink" did not give increased freedom from scab. — G. II . 

 Coons. 



1170. Essig, E. 0. New hosts of oak-root fungus in Humboldt County. Monthly Bull. 

 Comm. Hortic. California 2: 79-80. 1919. — The old roots of stumps of the redwood (Sequoia 

 sempervirens) and the roots of the wild hazel (Corylus rostrala var. californica) are reported 

 as being host plants for the oak-root fungus (Armillaria mellea). — E. L. Overholser. 



1171. Fernow, B. E. Blister rust control. [Rev. of: Anonymous. Report on white 

 pine blister rust control, 1918. American Plant Pest Committee Bull 2. 16 p.] Jour. For- 

 estry 17: 325-326. 1919— See Bot. Absts. 3, Entry 532. 



1172. F[oster], J. H. Rev. of: Rankin, W. Howard. Manual of tree diseases. S98 p. 

 Macmillan Co.: New York, 1918.] Jour. Forestry 17: 321. 1919. 



1173. Francis, W. Orchard pests and how to combat them. Jour. Agric. S. Australia 

 21: 951-954. 1918. — Scab of apricot, leaf curl of peaches and prunes, black spot of apples 

 and pears. — D. Reddick. 



1174. Fromme, F. D., and S. A. Wingard. Bean rust: its control through the use of 

 resistant varieties. Virginia Agric. Exp. Sta. Bull. 220. 18 p., pi. 1-5. 1918. [1919.]— Rust 

 (Uromyces appendiculatus) is an important disease of beans (Phaseolus) in Virginia with losses 

 especially heavy on pole beans and on bush beans grown for dry-shell purposes. Kentucky 

 Wonder (pole) and Tennessee Green Pod (bush) are the varieties most commonly injured 

 in gardens and Navy Pea in fields. Defoliation following an attack of rust may result in total 

 loss of the crop. Different varieties, some 80 of which were tested, showed marked variation 

 in susceptibility. Varieties are classified according to relative susceptibility as rust-free, 

 rust-proof, rust-enduring, and rust-susceptible. Rust may be eliminated as a factor in | 

 duction by use of the non-susceptible varieties which are recommended. — F. D. Fromme. 



1175. Higgins, B. B. Gum formation with special reference to cankers and decays of 

 woody plants. Georgia Agric. Exp. Sta. Bull. 127: 23-59. PI. 1-6, fig. l-lo. 1919.— See 1 

 Absts. 3, Entry 1230. 



1176. Horne, W. T. Oak-fungus, oak-root fungus disease, fungus root-rot, toadstool 

 root-rot or mushroom root-rot. Monthly Bull. Comm. Hortic. California 2: 64-<'>v Fig. S6S9, 

 1919.— The importance, symptoms, cause, characteristics, and control of the oak-root fungus 

 (Armillaria mellea) and the utilization of infested areas are discussed. Nearly all trees and 

 shrubs may be attacked. The fungus is rather slow-acting and hence, annual or short-lived 



