32 



MASS. EXPERIMENT STATION BULLETIN 371 



The cranberry girdler seldom infests areas kept well sanded; it works 

 chiefly in the trash of unsanded bogs among thick vines. Complete flow- 

 age after picking, beginning by September 25 and continuing for a week, 

 is a good control. Complete flooding for about 20 hours, the last of Au- 

 gust or early in September, to check a severe attack is sometimes advis- 

 able, especially with the Howes variety. A serious infestation can be 

 largely controlled by dusting with pyrethrum, 50 pounds to an acre, two or 

 three times at four-day intervals in earh- to mid-June to kill the moths. 



Both the brown spanworm (hatches late in June) and the false army- 

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

 are hatching with 3 pounds of dry lead arsenate in 50 gallons of water 

 (Fig. 28). The latter is also controlled by flooding for 10 hours. 



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



Tlie yellow-licadcd fireworm attacks only bogs witliout flowage. It is 

 checked easily by spraying with 3 pounds of dry lead arsenate in 50 gal- 

 lons of water, 250 gallons an acre! 5, about May 22 or about July 13. 



The last brood of the tip worm sometimes does nuicii liarm where tiie 



" This is the aiiiount to use of all Icail 



