32 MASS. EXPERIMENT STATION BULLETIN 447 



Both the brown spanworni (hatches late in June) and the false armyworm 

 (hatches May 8 to 12) can be checked by spraying when the worms are hatching 

 with 3 pounds of cryolite or dry lead arsenate in 50 gallons of water (Fig. 28). 

 The latter is also controlled by flooding for eight hours about May 18. 



The yellow-headed fireworm attacks only bogs without flowage. It is checked 

 easily by spraying with 3 pounds of dry lead arsenate in 50 gallons of water, 250 

 gallons an acre, about May 22 or about July 13. 



The last brood of the tipworm sometimes does much harm where the vines 

 are not thrifty by reducing the bud formation for the crop of the following year. 

 Resanding every other year controls this insect well on most bogs, but a bog 

 should not be sanded so often for this alone. 



Fig. 28. Spraying to Control Cranberry Insect Pests. 

 Note the long line of hose handled by the men. The power sprayer is always on the upland near 



the bog margin. 



Growers should sweep their bogs with a net every few days till midsummer to 

 find and gauge insect infestations (Fig. 29). It often does not pay to treat a 

 light infestation with ground equipment, especially if the crop promises well, 

 because of the mechanical injury involved. Counts of less than nine gypsy 

 moth caterpillars or cutworms or less than thirty-six spanworms to fifty sweeps 

 of the net may be disregarded, but closer control than this, with dusts and 

 helicopters available, is desirable. Over three blunt-nosed leafhoppers to fifty 

 sweeps should be treated. 



Weedsi4 



All weeds should be removed from a bearing bog by the time the vines bloom 

 and if sedges, rushes, cotton grass, or cut-grass appear later, they should be 

 cleared out again, regardless of the injury done in weeding. Late fall and earl> 

 spring, when the vines are dormant, is the best time to dig out such woody weeds 



^* The National Cranberry Association has published a handbook on cranberry bog weeds, weH 

 illustrated with photographs. 



