FUMIGATING AND SPRAYING 



117 



fested with green fly or aphis and you will have it in the right condi- 

 tion to get almost anything else going, for the insects stunt its 

 growth and weaken it. I claim that stock in a greenhouse faithfully 

 sprayed lightly once a week can be kept clean if it is clean when 

 you start out. But this must be kept up. Let a Calceolaria, a 

 Cineraria or a Carnation once get full of green fly and you will have 

 real trouble in getting the plants clean again. It is not that this 

 cannot be done, but why permit the condition in the first place? 



The good grower never allows green fly or aphis to appear. 

 By so doing, he keeps other pests away. Consider just for a moment 

 the loss of money due to crippled Carnation flowers where green fly 

 has done its work. Isn't it a crime to permit it, when you have to 

 depend on the dollars and cents you get out of the plants ? Yet each 

 year a lot of growers will not pay proper attention to their stock in 

 this respect. With each year spraying becomes more necessary, 

 and the older the houses and the longer they have been in use the 

 more so. If you fumigate rather than spray, the same is true. 

 Light doses, but often, is the thing, rather than to start only when 

 you see signs of trouble and then maybe overdo it. 



Fig. 36. SPRAYING. The good grower will everlastingly keep on fighting insects 



and plant diseases. He doesn't wait until there are signs of aphis, midge or green 



fly, but by spraying regularly once a week or so prevents their appearance 



