210 



GREENHOUSE MANAGEMENT. 



and the heating apparatus should be ample to keep the 

 house at GO degrees during the coldest weather. (2.) The 

 plants should be of forcing varieties and should never be 

 subjected to a check for want of food, water, air, or 

 warmth, or from an excess of any of these. (3.) In 

 watering, use enough water to moisten the entire soil, 

 and then withhold until the plant shows signs of need- 

 ing more. When the plants are small, and at other 

 times when the fruit is not setting, syringe the plants on 



FIG. 77. GROWING MUSHHOOMS ON GHEKNHOUSE BENCHES. 



bright days and keep the walks wet down. Whenever 

 fruit is setting, the house should be kept warm and dry. 

 The atmosphere can be deprived of much of its moisture 

 by ventilating during the warm part of the day. 



The red spider is one of the worst enemies in the 

 tomato forcing-house, but the above treatment will keep 

 it in check. If the soil is kept too wet, the develop- 

 ment of nematodes or eel worms upon the roots is 

 invited and they frequently rot off. The stems and 

 foliage are also attacked by various bacterial and fun- 



