22 FARMERS BULLETIN 860. 



coiiiineiices within the rotoons in hite May and -June on winter-flowed 

 bogs and slightly earlier on dry hogs. 



THE ADTTLT. 



Moths ai)pear in numbers on the bogs in July and fly for a period 

 of about a month. They hide among the vines during the day but 

 become quite active in the evening. The forewings are dark ash gray, 

 Avith a distinct pinkish tinge, and mottled with white and bkckish. 

 Two dark dots on a whitish patch near the front margin of each 

 forewing will aid in recognizing this pest. The hind wings and the 

 underside of both pairs are shining grayish brown. (Fig. 19, at left.) 



The egg is flattened, disklike to oval in outline, and so plastic when 

 laid that it adapts itself readily to any irregularity of the surface on 

 which it is deposited. In appearance, at first white, then watery 





Fic. 20. — Cranberry fruitworm : Larva. Much enlarged. 



translucent, they -soon become pale yellow. The eggs usually are 

 deposited in the calyx cup under the lobes, but they may be on any 

 part of the berry. The period of incubation is about '> days, but 

 may be prolonged to 8 days in one which is parasitized. 



Treatment. 



Spraying with arsenicals has been tried i-epeatedly for the control 

 of the fruitworm, but with so little success that it can not be recom- 

 mended. 



Growers very generally recognize that late holding of the winter 

 flowage serves to keep fruitAvorms in check; the evidence in Massa- 

 chusetts is that holding the floAvage until May 20 will i)rove bene- 

 ficial if practiced every other year. The early application of the 

 Avinter flowage in the fall has not proved as valuable as the late 

 holding in the spring. Recent studies of Dr. H. J. Franklin at the 

 JNIassachusetts State Bog have shown that fall flooding after picking 

 is of considerable value in destroying fruit worms. 



In the case of a bog that has become unpi-ohtable or is barely pay- 

 ing its way, owing to its infestation by fruitworms and other insects, 



