CALCIUM SULPHIDE. 151 



Hypo7nyces perniciosns, Magnus (mole disease). — Constantin and 

 Dufour found that this disease can be combated by calcium sulphides. 



Nectria ditissime, Tul. (canker of the pear-tree, canker of the apple- 

 tree, canker of the beech-tree) ; Nectria cinnibarina, Eode. (necrosis 

 of wood). — Mohr advises to combat these two parasites with glycerin- 

 ated sulphides. The wound is deeply incised, cleaned, and then coated 

 several times with a solution of glycerinated sulphide of calcium, 

 titrating 15°-25° B. When the wound is dried up it is covered with a 

 linseed oil varnish (? boiled oil). To obtain a cure it is sometimes 

 well to repeat this treatment several times a year. It is also recom- 

 mended to use a concentrated solution of sulphide mixed with a thick 

 milk of lime and to coat the wound after drying with a mastic of some 

 sort. 



Fusidadium Pirimim. Fuckel (pear scab); Fuslcladium dentriticum 

 (apple scab). — Mohr advises the use of glycerioated sulphide of lime, 

 of the usual strength, as soon as the fruits have formed and are the 

 size of a pea, two or three additional sprayings being given during 

 the summer. 



Hydnes and Polypores are combated with calcium sulphides : 

 Hydnum Schiedermayri, Heufl. ; Polyporus sulpliureus, Fries ; Poly- 

 porus igniarius, Fries (false tinder fungus). — Mohr advises to combat 

 this disease by excising all the diseased wood and to plaster the 

 wounds several times with glycerinated sulphide of lime of 20° B., then 

 to coat with mastic. Mohr also advises to combat certain rusts with 

 calcium sulphide thus : Phragmidmm suhcorticmn, Schrank (rose rust), 

 and also the rust of the pines and spruces, such as GJirysomyxa abietis, 

 Unger (rust of needles of Epicea), and others. The treatment should 

 be carried out in May so as to avoid fresh infection of the plant. 

 Peridermium pini, Walr. (vesicular rust of the bark of the pine) ^ ; 

 Periderm'mm oblongisporium, Fuckel (vesicular rust of pine needles). — 

 Mohr advises to combat these diseases with his bouillie diluted with 

 10-12 parts of water. The result it appears is as good as with bouillie 

 bordelaise. 



Exoascus deformans, Fuckel (Cloque du Pecher), (blistering, 

 wrinkling, or curling up of the leaves of the peach). — Pierce and Mohr 

 advise spraying with calcium sulphide to prevent this disease ; accord- 

 ing to these authorities complete success is obtained if, as soon as it 

 makes its appearance on the first leaves, they are sprayed with a 4 per 

 cent solution. 



Use against Insects.^ Car pocapsa pomonella, L. (eodlin moth, 

 apple worm, pyralis of the apple). — Mohr advises calcium sulphide 

 glycerinated to ^'^ to prevent apples becoming wormy. To prevent the 

 hatching of the eggs laid by the female on the young fruit a first 

 spraying should be made as soon as the fruit is formed or soon after 

 flowering ; the fruit should be inspected from time to time and sprayed 

 afresh where required. 



Phylloxera vastatrix, Planch, (phylloxera of the vine). — Mouillefert 

 tried to determine the action of calcium pentasulphide on this louse, by 



^ Pine " cluster cups ". — Tr. 



