1907.] Insect, Fungus and other Pests. 357 



of the white rust of crucifers will be found in Leaflet No. 163 

 (White Rust of Cabbages). 



Apple-tree Mildew. — Specimens of apple from Canterbury 

 were found to be affected with Apple-tree Mildew, Sphaerotheca 

 mali, Magnus, a disease which is dealt with on p. 358. 



Disease on Gooseberries. — Diseased gooseberry plants sub- 

 mitted by a Teignmouth correspondent were attacked by the 

 fungus Pseudopeziza ribis, Klebahn. It is now too late in the 

 season to derive any benefit from spraying, but if all leaves 

 are burned or buried the disease will probably not recur next 

 year. 



Mildew on Euonymus. — A correspondent submitted specimens 

 of mildewed Euonymus Japonicus, L., from Lewisham, the 

 foliage of which was found to be infested by the parasitic fungus 

 Oidium Euonymi-japonicce , Sacc. This pest is, so far as is at 

 present known, confined to euonymus. The infested shrubs 

 should be dredged with flowers of sulphur when the leaves are 

 damp, and a second time if the sulphur is washed off by rain. 

 The treatment should be repeated early in the spring. All 

 diseased leaves should be collected and burned. 



Rose Mildew. — Rose leaves sent from Claygate, Surrey, were 

 found to be attacked by Rose Mildew, Sphaerotheca pannosa, 

 Lev. This mildew will not pass to fruit trees. Diseased trees 

 should be sprayed with a solution of sulphide of potassium 

 (liver of sulphur), 1 oz. in 2 gallons of water. In spring, just 

 when the leaves are expanding the trees should be dredged 

 with flowers of sulphur. 



Rose Rust. — Other specimens of rose forwarded from East- 

 bourne were infected with the Rose Rust caused by the fungus 

 Phragmidium subcorti'catum, Winter. The summer fruit of 

 the fungus is represented by myriads of orange-coloured 

 powder-like spores. About the end of August the yellow 

 patches give place to black spots which are composed of tufts 

 of minute resting-spores. The latter remain dormant during 

 the winter and germinate in the following spring. 



The reappearance of the disease the following year is therefore 

 entirely dependent on the presence of resting-spores in the- 

 neighbourhood, and the utmost care should, therefore, be 

 taken to collect and burn all fallen leaves in autumn. It 

 should also be noted that the fungus attacks wild roses ; if 



