230 FRUIT CULTURE UNDER GLASS. 



Green-fly can be kept in check by the syringe also, 

 and is easier killed than the thrip with moderate 

 fumigations of tobacco-smoke. Melon-plants are af- 

 fected with a corky-looking enlargement of the stem, 

 generally called canker, just above the surface of the 

 ground. Some varieties are more subject to this than 

 others. The best preventive is to keep the soil about 

 the collars of the plants a little higher than the bed, 

 and to put some charcoal-dust round the stem, and not 

 to apply water at that part. 



