CONTENTS 



Page 



Introduction and methods 3 



Media for seedage and their relation to damping-off 4 



Soil reaction and damping-off 6 



Soil moisture and damping-off 7 



Temperature and damping-off 8 



Soil fungicides and damping-off 9 



Formaldehyde 9 



Acetic acid, acetic acid dusts, and vinegar 11 



Pyroligneous acid 16 



Formic acid 20 



Acetaldehyde 20 



Acetone 20 



Ethyl alcohol 20 



Salicylic acid 21 



Tannic acid 22 



Ammonium hydroxide 22 



Ammonium thiocyanate 24 



Calcium cyanamide 24 



Calcium hypochlorite 27 



Other calcium salts 27 



Potassium permanganate 28 



Charcoal 29 



Aluminum sulfate 29 



Copper and copper salts 30 



Mercuric chloride 32 



Zinc sulfate 34 



Sulfuric acid 34 



Sulfur 35 



Summary 35 



Literature cited 37 



Appendix — Ornamental plants used in the experiments 42 



