4o8 Diseases of Greenhouse Crops 



means the elimination of countless generations of 

 these pests. 



Thoroughness is as important in spraying as it 

 is in everything else in life. Especially is this true 

 for the control of fungous diseases. 



Spraying Machines 



Success in spraying often depends on the sprayer, 

 and especially on the nozzle. In small scale such as 

 under greenhouse conditions, it is next to useless to 

 invest in elaborate expensive machinery. A small 

 bucket pump with long nozzle (fig. 81) as used by 

 Professor Paddock of the Texas Experiment Station 

 has given good satisfaction. The Auto Spray No. i 

 is a very desirable spraying machine for indoor 

 plants. 



Hygienic Considerations 



Since plants are endowed with life they readily 

 respond to intelligent hygienic treatment. This is 

 especially true with indoor plants, which at best are 

 growing under abnormal conditions. Every effort 

 should, therefore, be made to create indoors as nearly 

 normal conditions as possible. The effect of proper 

 sunlight, heat, moisture and ventilation has already 

 been discussed under pages 53-85. Cleanliness is also 

 an important consideration. The walks, interior 

 walls and glass should be kept as clean as possible. 

 Old and used pots should be scrubbed and washed 

 at least once a year. Dead or infected plants should 



