CRANBERRY DISEASES 195 



period of inactivity are not certainly known. With the re- 

 sumption of growth the tissue in the region of the mycelium 

 is killed, and the lesions described above are produced. The 

 fungus fruiting bodies, pycnidia, break through the epidermis, 

 and expose their tips. Each pycnidium contains, at maturity, 

 many pycnospores which coil out in a gelatinous tendril. A 

 second type of fruiting body, perithecia, is sometimes de- 

 veloped, but these occur less frequently, and are not regarded 

 as important in the dissemination of the fungus. 



The conditions favoring the fungus are not unusual. Warm, 

 wet weather furnishes the best conditions for maximum devel- 

 opment. If berries are kept at a high temperature after pick- 

 ing, the disease is greatly increased. 



Control. 



It has been shown that bordeaux mixture, 5-5-50, when 

 thoroughly applied, gives satisfactory results. Resin-fish-oil 

 soap at the rate of four pounds to fifty gallons is added as a 

 sticker. Five applications are recommended. In general, 

 not more than fifteen days should elapse between any two appli- 

 cations. The first should be made early in June ; the second 

 later in June when the blossoms are ready to open ; third, as 

 soon as the plants have passed the height of their blooming 

 period; subsequent applications at fifteen-day intervals. 



The evidence at hand indicates strongly that regulation of 

 the water-supply is a very important factor in the control of 

 all cranberry diseases. The amount needed varies with the 

 type of soil and the contour of the land. The supply should 

 be controllable. It should be constant; fluctuations should 

 be avoided during the growing-season. Keeping the plants 

 continuously moist, but not wet, is recommended. 



Bog sanitation should be practiced. Dead leaves and 

 vines should be destroyed. This must be done before the 

 spores are discharged, to be effective at least within a week 

 after the water has been withdrawn from the bogs in the spring. 



