CRANBERRY GROWING 



33 



as hardback, chokeberr}, sheep laurel, leatherleaf, and poison ivy, and any 

 weeds that may be green then (Fig. 20C). 



Fig. 29. Examining a Bog with an Insect Net. 



Water-white kerosene, 300 to 600 gallons an acre, applied as a spray or with 

 a watering pot the second week in May, is a good control for grasses, sedges, 

 rushes, loosestrife, horsetail, bayberry, alders, and brambles. Ferrous sulfate, 

 used drj' in July or August, controls sensitive and feather ferns, asters, and tear- 

 thumb. A small handful of ferric sulfate, applied at the base of each plant early in 

 the growing season, is very effective on horsetail, small ferns, rojal fern, hardhack, 

 wool grass, and spike rush or needle grass. A spray of 20 pounds of copper sulfate 

 in 100 gallons of water, applied 400 gallons an acre early in August, is the best 

 treatment for nut grass. This spray, applied 600 gallons an acre early in the spring 

 or late in the fall, kills haircap moss well. Sodium arsenate, IJ^ pounds in 100 

 gallons of water, 150 gallons to the acre, applied in August, helps greatly to 

 control wild bean. Ditch weeds and undesirable growths on the uplands are 

 killed with a spray of 15 pounds of sodium arsenite in 100 gallons of water. 

 Paradichlorobenzene under a sand cover eliminates poison ivy, wild bean, and 

 chokeberry. Special cutters for clipping weeds, several feet wide and operated 

 with small air-cooled engines, are sometimes useful. They cut the weed tops into 

 small pieces that fall down among the vines and do not have to be removed from 

 the bog. 



