198 



Garden and Forest. 



[April 24, 1889. 



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phur (brimstone) heated to nearly tlie boiling- point, in the 

 room for three or four hours, twice or three times a week. 

 The apparatus used at Amherst was a Florence or Monarch 

 hand-stove with the sulphur in a thin iron kettle. Enough sul- 

 phur must be evaporated to fill the room with the vapor, so 

 that it will be visible and c^ive something of the odor of sulphur. 

 Rose m\\dew{Erysiphe pan)iosa)\?, a very common difficulty 

 in green-houses not properly constructed. It may be Ijrought 

 on by the exposure of plants while growing rapidly to draught 

 of cold air, by high temperatiu-e night and day, by watering 

 and syringing late in the day, 1)V lack of plant-food, bad drain- 

 age, extreme dryness, or anything, in short, that may weaken 

 the plant. This mildew was abundant, but after the use of the 



sulphur it quickly disappeared totally. The remedy had the 

 same effect on the Rose-leaf blight, Actinomena rosea. 



The greatest obstacle to the growth of good Lettuce tmder 

 glass is perhaps the Lettuce mildew {Peronospora gangliformis). 

 A fair trial of evaporated sulphur led to the conclusion that it will 

 prevent the development of the milde\^', but when the fungus 

 is once established it will not destroy it. Before trying reme- 

 dies Professor Maynard suggests, as preventive measures, 

 that Lettuce imder glass be grown at low temperature, r;mg- 

 ing from 35° to 40° at night to 50" to 70° during the day ; 

 that an abiuidance of plant-food be supplied at all times ; 

 tiiat soluble nitrates are valuable in qin'ckly developing a re- 

 sistent vigor of leaf ; that an abundance of water must be 



