PUCCINIA 299 



The only remedy is to dig up and burn all infected plants, 

 which can be recognised early in the season by their distorted 

 stems and small, pale leaves. Care should be taken to 

 remove all the underground portions of diseased plants. 

 Plants from infected beds, even if showing no signs of disease, 

 should not be used for establishing new beds, as they may be 

 infected with spores from diseased plants. It is also impor- 

 tant to remember that our wild mints are often badly diseased, 

 and the pest might be introduced to cultivated mint if hay or 

 litter containing diseased wild mint in a dried condition is by 

 any means brought in contact with cultivated mint. 



Chrysanthemum rust (Puccinia chrysanthemi, Roze) sud- 

 denly attacked cultivated chrysanthemums in a wholesale 

 manner some few years ago ; it is yet with us, but the sting of 

 its virulence is past, except where there is gross negligence 

 or ignorance. The uredo stage forms numerous small, brown 

 spots on the leaves, and where the fungus is abundant the 

 plant is killed. The teleutospore form is very rare, if known 

 at all in this country. 



Uredospores brown, aculeate, 20-33X18-25 fi. Teleuto- 

 spores very irregular in form, often only 1 -celled. 



The disease spreads rapidly, and keeps itself going from 

 year to year by means of uredospores alone. Diseased 

 plants should be isolated at once, and sprayed at intervals 

 with dilute Bordeaux mixture. Pick off and burn badly dis- 

 eased leaves. This disease is often imported with plants 

 from the continent, and all such should be carefully examined 

 on their first arrival. 



Massee, Gard. Chron. and Gard. Mag., Oct. 8 (1898). 



Rhubarb leaf cluster-cups (Puccitiia phragmitis, Schrot.) 

 sometimes attacks rhubarb, it also occurs on various species 

 of dock (Rumex). It causes somewhat large, red, more or less 

 circular patches, at the centre of which are grouped numerous 

 ' cluster-cups ' with white, torn margins. The aecidiospores, 

 produced in chains, fill the ' cluster-cups.' The uredospores 

 and the teleutospores grow on Phragmites communis. 



Aecidiospores ( = Aeddium rubellum, D. C), whitish, sub- 

 globose, echinulate, 15-25 /* diam. 



Uredospores forming rather large, dark brown sori, para- 

 physes absent. Spores ovate or elliptical, brown, echinulate, 



2 5-35>< I 5- 22 / x - 



