590 [ DISEASES OF THE VINE. 



appearance tht affected foliage should be collected and 

 burned, and the vines dusted frequently with sulphur 

 containing sulphate of copper. 



Root -rot. The disease may be due to the presence 

 of several fungi, viz : .Dematophora necatrix, Hartig., D. 

 glower ata, Viala., or to Armillaria mellea Vahl. The 

 lesions caused by these species of fungi are much the 

 same, and have been already described elsewhere. De- 

 matophora glomerata, Viala. , so far has not been found in 

 Malta, and Armillaria mellea, Vahl., is much more 

 common than Dematophora necatrix, Hartig As already 

 stated elsewhere the mycelium and other i hizomoi phic 

 productions ot Armillaria are easily distinguished on 

 account of their emitting a singular phosphorescence 

 when taken in a dark place. The mycelium of Demato- 

 phora is made up of an abundant production of snowy 

 white filaments which covers the diseased roots, among 

 these filaments are formed thick root-like cordons, with 

 the production of sclerotia in the shape of large pyriform 

 concretions on which the conidial fructifications are pro- 

 duced The vine attacked by these fungi soon assumes 

 a chlorotic appearance and a fatal result is the rule. 

 The remedies suggested against these fungi consist in 

 (a) thoroughly draining the land, (b) removing and 

 pur A!) ig all diseased tissues, (c) disinfecting the soil by 

 watering it with a 3 per cent, solution of sulphate copper, 

 leaving the place empty, and the soil well exposed to the 

 action of the sun, for some time before replanting. For 

 the treatment ot nurseries and new vineyards Foex has 

 suggested the use of bisulphide of carbon injected into 

 the soil at the rate of 70 grammes for every square 

 meter of area. 



The sooty fungus (Capnodium salicinum, Mont. = 

 Fuma%o vagai^s, Pers. attacks all the green parts of the 

 vine, and also old stems and branches, but this is in 

 reality a saprophytic species living on the honey-dew 



