DISEASES OF PLANTS. 651 



piles. The latter method, however, is thought to be hardly as efficient 

 as the former on account of the fact that many spores will be scattered 

 in the cutting- and piling. It is thought that a thin coat of lime spriu- 

 kled over the ground and left there during the winter will also prove 

 beneficial in destroying those spores which may have found lodgment 

 on the soil. 



Two fungus enemies are described which attack the asparagus rust 

 and may, to some extent, help hold it in check. These are Darluca 

 jilum and Tubereularia perslcina. 



The author gives briefly a summary of the literature relating to 

 asparagus rust in the United States. 



Briefly summarizing the conclusions, it is stated that the asparagus 

 fungus (Pucdn ia asparagi) was described as early as 1805 and is generally 

 distributed throughout Europe. Aecidial, Uredo, and Teleutosporic 

 forms are all found on the asparagus plant. Spraying experiments with 

 Bordeaux and similar fungicides reduced the amount of rust about one- 

 fourth. Among the varieties tested Palmetto proved less susceptible 

 than others. The pistillate plants also appear less subject to attack 

 than the staminate ones. This rust is found on other species of aspar- 

 agus, but so far is not known to occur on any wild plants or weeds 

 other than asparagus. 



Experiments in combating the rose rust in 1898, K. Mohr 

 {Rosen Ztg., 13 {1898), ¥o. 5, pp. 79, 80).— The occurrence of the rose 

 rust on quite a number of varieties of roses during the summer of 1898, 

 led the author to conduct a series of experiments for the prevention of 

 the disease. It was successfully combated by spraying the plants with 

 a. mixture composed of 9 liters of limewater and f liter Sulfurin. The 

 lime water was formed by slaking quicklime and thoroughly stirring it 

 before using. After mixing with the Sulfurin the mixture is allowed to 

 settle and the clear liquid is sprayed upon the plants. Investigations 

 made from time to time during the season on some of the more suscep- 

 tible varieties showed that where the plants had been sprayed no rust 

 was present, while upon the unsprayed ones the disease was very abun- 

 dant. In spraying the roses particular pains must be taken to spray 

 both surfaces of the leaf, as well as to apply it thoroughly to the stems 

 of the plants. The author states that the same mixture is also very 

 beneficial in combating the rust of mallows (Puecinia malvacearum). 



Concerning the adherence of copper compounds -which are 

 used in combating diseases of the grape, G. M. Guillon and G. 

 GouiRAND (Compt. Rend. Acad. Sci. Paris, 127 (1898), No. 4, pp. 254-256; 

 11, pp. 423, 424). — The authors have investigated the subject of the 

 adherence of different fungicides, making a study of the following: (1) 

 Bordeaux mixture, composed of 2 per cent of copper sulphate and suffi- 

 cient lime to render the mixture slightly alkaline; (2) the same with 

 the addition of 1 per cent molasses; (3) the same with the addition of 

 0.3 per cent gelatin; (4) mixture of 2 per cent copper sulphate and 3 



