270 



Effective Farming 



known that could be sprayed on the trees while they were in 

 leaf. Now, either self-boiled lime sulfur or a very weak solu- 

 tion of boiled lime sulfur is used for the purpose. If the disease 

 is serious, several sprayings are made each year. Weather 

 conditions have much to do with the spread of brown-rot; 

 if bright, dry weather prevails at the time the fruit is ripening, 

 the disease is not likely to be serious , but if hot, moist weather 

 occurs, the spores grow very rapidly and often with such weather 



at ripening time, 

 the crop may be 

 entirely destroyed, 

 unless the growth 

 of the rot is pre- 

 vented by timely 

 sprayings. 



Apple-blotch. A 

 disease that some- 

 what resembles ap- 

 ple-scab is apple- 

 blotch. On infested 

 fruit small, light- 

 brown, star-shaped 

 blotches appear and 

 spread rapidly, be- 

 coming darker in 

 color and often join- 

 ing together to form large blotches that may cover more than 

 half the apple. Often the surface of the apple cracks. On 

 the leaves the blotches are found as small, light-brown spots, 

 smaller than those of the scale. On the twigs cracks in the 

 bark are seen. The spores live through the winter on the 

 twigs. The remedy is to spray with bordeaux mixture three 

 or four weeks after the blossoms fall. If the disease is very 

 bad, it is advisable to make two or three more sprayings at 

 intervals of three weeks. 



FIG. 116. Mummies of brown-rot of peach. 



