94 Gardening Under Glass 



the leaves. They operate indeed Hke a scale and 

 should be fought by fumigation. A recent insec- 

 ticide, "Insectonos," which was awarded an 

 honorable medal by The Society of American 

 Florists, is recommended particularly for the 

 white fly. I have not yet tried it myself, but 

 hear favorable reports on it. 



Red Spider. — This persistent little pest is 

 about the size of a grain of red pepper, and just 

 about as irritating. Working on the under sides 

 of the leaves, and behind a tiny web, he is not 

 discerned until the leaf shows a tiny yellow spot. 

 The leaf then turns yellow altogether, and even- 

 tually drops. The most effective thing to use 

 with these is clean, cold water, applied with as 

 much force as possible. Use a syringe fre- 

 quently if the water in the house is not under 

 sufficient pressure to give a forceful stream. 

 Indeed moisture in the air is this pest's great 

 enemy, and its presence is indicative of two 

 much dry heat. 



After all, the most effective way of fighting oft' 

 these attacks is to be strict about greenhouse sani- 

 tation. Always clean up, and burn promptly, 

 refuse, fallen leaves, dead plants, and rubbish 

 of all kinds which might possibly make a harbor- 

 ing place for germs, spores, or eggs. An occasion- 

 al spraying under the benches with a disinfec- 



