252 FUNDAMENTALS OF AGRICULTURE. 



Keep down weeds, and trim and train the vines so as 

 to secure the best ventilation. Spray thoroughly with 

 Bordeaux mixture, beginning when the second or third 

 leaf shows; apply again before the blossoms open, and 

 a third time soon after the blossoms have fallen; two 

 more applications at intervals of ten days or two weeks 

 will be enough in ordinary seasons. Watch the 

 weather closely and try to make each application a day 

 or two before a period of rainy weather, since infec- 

 tion takes place at such a time. 



EXERCISE. Bring specimens of unhealthy or diseased fruits to the 

 classroom and identify the diseases they are affected with. 



SECTION XXXVIII. GARDEN CROP DISEASES. 



Bean Pod Spot or Anthracnose. The fungus pro- 

 duces on the pods of kidney beans spots of variable 

 size, with reddish borders and dark brown, sunken 

 centers. On close examination minute pinkish masses 

 of spores may be distinguished scattered over some of 



BEAN POD SPOT. 



the larger spots. Seeds from badly infected pods are 

 apt to contain mycelium, which remains dormant in the 

 seeds and renews its growth as they germinate. It 

 produces brown spots and spores on the seed and on 

 leaves of plants grown from such infected seeds; these 

 spores in turn affect the young leaves, causing their 

 veins to become brown. In this way large numbers 

 of spores are produced by the time the pods begin to 

 form. When seed absolutely free from infection can 

 be used for planting, pod spot is not likely to occur; 

 such seed may be had from pods perfectly free from 

 spot. Satisfactory disinfection of seed seems to be 

 impracticable. Spraying with Bordeaux mixture helps 



