152 EXPERIMENT STATION EECORD. 



Mulch injury follows the heavy mulching of the plants and may be avoided by 

 the use of light mulches and spraying with Bordeaux mixture before the appli- 

 cation of the mulch. 



The fungus diseases described are needle cast due to Lopliodermmm pinastri, 

 blight caused by Pestalozzia fnnerea, root rots due to RMzoctonia sp., and stem 

 girdle caused by a fungus which may prove to be P. liariigii. Notes are also 

 given on the red cedar blight, concerning which but little is known, and no 

 recommendations are made for its control. 



Herpotrichia and Neopeckia on conifers, W. C. Stubgis {Phytopathology, 

 S {1013), No. 3, pp. 152-158, pU. 2). — The author reports having observed in 

 northern Wyoming in 1902 the prevalence of a fungus on leaves and twigs of 

 Ahics lasiocarpa and Picea engelmamii. Later and in nearly the same locality 

 what appeared to be the same fungus was found on Pinus murrayana. An ex- 

 amination made of the specimens collected showed that that occurring on the 

 fir and spruce was H. nigra, while that on the pine was N, coulteri. 



The damage caused by these two fungi is, so far as the author's observation 

 goes, very slight, but on account of the possibility of their causing the destruc- 

 tion of conifers in seed beds or later, attention is called to them, and both 

 species are described and their synonymy given. 



A new rust, G. E. Stone {Massachusetts 8ta. Rpt. 1912, pt. 1, pp. 4^-44)- — 

 The occuiTence in the State of the Cronartium form of Pendermium stroti, 

 the cause of the white pine blister rust, is noted. The rust was observed on 

 a block of 200 currant plants which had been introduced from a New York 

 nursery. Nearly all the plants were infected, although a small block of black 

 currants a quarter of a mile away showed no indication of the fimgus, nor did 

 a rigid examination of a plantation of 8-year-old pines reveal any signs of 

 blister rust infection. As the black currants are not considered of any great 

 economic importance the author suggests their destruction. 



Spotting of rubber on the plantation, V. Cayla {Jour. Agr. Trop., 13 {1913), 

 No. 145, pp. 221-223). — Referring to articles published by K. Bancroft (E. S. R., 

 29, p. 451) and others, the author gives a brief outline of the beginning and 

 progress of this condition of rubber appearing in the various stages of its pro- 

 duction, mentioning several organisms found in connection therewith. 



An investigation of lime-sulphur injury, its causes and prevention, V. I. 

 Satro {Oregon Sta. Research Bid. 2, pp. 32, p?s. 4)- — Attention is called to the 

 uncertain usage of the term lime-sulphur injury, and on account of this indefi- 

 nite use the author has carried on some investigations to determine what chem- 

 ical ingredients of the lime-sulphur spray can be classed as injurious in a strict 

 sense. 



A series of experiments was conducted in which the various materials which 

 go to make up the spray and the compounds which are liable to occur in the 

 spray before and after its application were used. These were sprayed on 

 potato and bean foliage as well as on the foliage and fruit of apples, pears, 

 cherries, peaches, and plums. Considerable varietal susceptibility to lime- 

 sulphur injury was noted, but it was found that the injury, in the proper use 

 of the term, was caused by the calcium polysulphids and to a somewhat less 

 extent by calcium thiosulphate. The other normal ingredients occurring in the 

 lime-sulphur mixture, either before or after its application, were found to be 

 harmless. 



A test was made of a number of samples of lime-sulphur mixture to determine 

 whether their specific gravity could be taken as an index of their possible 

 injurious effect. It was found that the specific gravity alone of the lime- 

 sulphur spray does not indicate to what extent sulphids are in solution and 



