46 PLANT CULTURE 



each gallon of the stock preparation must be diluted with 40 gal- 

 lons of water when used upon trees in leaf. 



F. Formalin Solution. Dr. W. E. Britton advises: 



a. I pint (1 pound) formalin to 50 gallons of water for grain 



smut. 



b. I pint formalin to 30 gallons of water for Potato scab. Soak 



for 2 hours. 



c. I pint formalin in 12^/^ gallons of water for sterilizing soil for 



damping-off fungus. Use %-i gallon for each square 

 foot surface treated. Cover for 24 hours after treating; 

 air afterward and stir soil; allow 7-10 days before seed- 

 ing or 10-14 days before transplanting. 



G. Corrosive Sublimate, i part to 1000 parts of water, 

 is one of the best disinfectants. It is used 2 ounces to 15 gallons 

 of water for Potato scab. Soak seed Potatoes in this 2 hours be- 

 fore cutting. Use wooden vessels. 



INSECTS 



Most of the miserable "bugs," so-called, are of two sorts — those 

 which eat the leaves and those which merely puncture the leaf to 

 suck out the juice. The gardener should become more familiar with 

 the ways of the insects, for some are valuable and should be ad- 

 mired. Those who have read Sir John Lubbock, Faber or Maeter- 

 linck realize that the insect world is quite as romantic as our own. 



Fig. 14 



A suckinK insect — note the formidable Head of biting insect — note jaws, large 



beak, used to pierce plants and extract compound eyes, and the feelers near 



juices. jaws and eyes. 



