CROP ENEMIES AND FRIENDS 



207 



of lime and copper sulphate in water, called Bor deaux'(do) mix- 

 ture, is generally used for fungous diseases affecting foliage and 

 fruit. It should be applied thoroughly as a fine mist. The for- 



Courtesy of New York Agricultural Station 



SPRAYED AND UNSPRAYED POTATO VINES IN A FIELD AFFECTED WITH BLIGHT 



mula for Bordeaux mixture and directions for its preparation are 

 given in the appendix on page 307. 



EXERCISE 



1. Keep a piece of bread several days in a damp, warm place. Ex- 

 amine under a microscope the mold which forms on it. 



2. Cut a sound apple with a clean knife and seal it in a clean, dry 

 jar. Cut another sound apple with a knife that has been inserted in 

 a rotten one; then seal the sound and rotten apples in a jar together. 

 What are the results? 



