160 MASS. EXPERIMENT STATION BULLETIN 206. 



Girdler cocoons containing cocoons of this species were collected on a bog 

 June 6, 1919, and the adult parasites emerged May 10 and 11, 1920, their 

 cocoon stage thus being remarkably long. It was estimated that about 

 10 per cent of the girdler cocoons on the bog from which these specimens 

 came contained this parasite. 



The girdler cocoons from which these three parasite species emerged 

 were collected at South Warcham, on a bog which always is flooded in the 

 winter and usualh^ is flowed for a day or two in June. They were taken 

 from an area, about SO yards from the bog margin, from which the vines 

 had been burned off in early May, before the thick accumulation of old 

 fallen leaves on the ground had dried out. The burning had been done to 

 destroy the girdler infestation, but it had not killed either this pest or the 

 brown spanworm (Epelis), pupa? of which were present in some numbers. 



The WTiter often finds barn swallows capturing large numbers of girdler 

 moths. ^ 



It was found in 1920 that 1 part of Black-Leaf 40 in 400 parts of water, 

 with 2 pounds of soap to 50 gallons added, kills girdler moths readily. 

 While this spray may not control the pest entirely, it probably will help 

 greatly where other means are lacking. It probably should be used about 

 four times, at three-daj^ intervals, for the moths emerge from their cocoons 

 in large numbers for a week or tAvo. The insecticide, tried in this connec- 

 tion at strengths of 1 to 600 and 1 to 800 with soap, and 1 to 400 without 

 soap, proved unsatisfactory. 



The Cranberry Root Grub {Amyhicoma vuJpina Hentz.). 

 On July 21, 1917, some wash boilers with the bottoms removed were 

 driven into the station bog until the vines came within a few inches of their 

 tops. Grubs of this species gathered from another bog were put in them 

 as follows, after which the boilers were covered tightl}^ with cheesecloth 

 for the rest of the summer. 



Table 9. — Root Grubs put in Boilers at Station Bog July 22, 1917. 



> Forbush: Useful Birds and Their Protection, p. 346, 1907. U. S. Dept. Agr., Bui. No. 554, 

 1917, p. 12. 



2 The grubs of various sizes were found working together, as is common witli this species, broods 

 started in two or tliree different years probably being represented. 



