88 orchid-geo^'ek's manual. 



is particularly inimical to such plants as Cattleyas, Lalias, 

 Odontoglossums, and other Orchids that have fleshy bulbs. 



When the leaves begin to rot, the diseased part should be 

 cut clean away, and a little sulphur rubbed on the part that is 

 cut, but not so that the sulphur can get to the roots. 



When the rot attacks the bulbs it should be seen to at once, 

 as it may be easily stopped by cutting the diseased part 

 entirely away with a sharp knife, no portion of the diseased or 

 decaj'ed bulb being left, and the wound should then be filled 

 up with sulphur, to keep it dry. Should any part of the fleshy 

 pseudobulbs of the above-named plants, or of those with 

 similarly -formed bulbs, become discoloured, and the dark or 

 discoloured part appear moist or wet, especially if any fluid 

 exudes from it on pressure, the wet or discoloured part should 

 be immediately cut out, or there is danger that the bulb will 

 be destroyed, as the rot is often much more extensive within 

 than the discoloured appearances on the outside would seem 

 to indicate. The plant should also be removed to a drier and 

 cooler place, and water should be given with the utmost care. 



The Spot is the dread of Orchid growers, and there is no 

 denying that when it attacks a plant it will soon disfigure it. 

 Some assert that it is infectious, but this we do not believe. 

 Indeed, wo should have no hesitation in placing a plant 

 infected with spot amongst a quantity of healthy ones, and 

 should any of these become diseased, we should feel certain 

 it was induced by a wrong course of treatment in some respect, 

 and that no blame could be laid to the charge of the neighbour- 

 ing plant. A great deal has been said and written respecting 

 this disease, which we have seen in various places, and on 

 other plants as well as on Orchids. We have not experienced 

 much of it ourselves, and have in most cases fomad that the 

 plants outgrew it. 



To prevent the disease making its appearance, no rotten 



