PINK RUST 253 



is effective. I have ascertained that — without spraying — 

 when first year plants are diseased, if the fading leaves are 

 collected, the plants are not diseased the second season, 

 whereas if the leaves are allowed to decay on the ground 

 under the plants, they are invariably attacked the second 

 season ; an observation tending to prove that resting-spores 

 survive the winter and germinate the following spring. I 

 have also ascertained that when the carpels are attacked 

 by the fungus, the seeds produce diseased seedlings, the 

 cotyledons usually bearing pustules. 



PINK RUST 



{Puccinia arenariae, Wint.) 



During certain seasons this fungus proves very destruc- 

 tive to pinks and carnations. Teleutospores only are 

 produced, the small blackish spots being scattered or 

 arranged in circles on the under surface of the leaves and 

 the stem. The spores germinate quickly when mature, 

 hence the disease spreads rapidly. 



Preventive Means. — Dilute Bordeaux mixture has 

 proved effective. I have also seen the disease checked by 

 sponging with a rose-red solution of potassium perman- 

 ganate. The fungus is very common on many wild 

 Caryophyllaceous plants, as chickweed, stitchwort, lychnis, 

 spurrey, etc.; therefore all such should be kept aloof from 

 cultivated plants. 



HAWTHORN CLUSTER-CUPS 



{Gymnosporangium davariaeforme, Jacq.) 



This destructive parasite is a typical representative of 

 the group of fungi called Uredineae, the members of which 



