42 MASS. EXPERIMENT STATION BULLETIN 347 



The Nutritive Value of Chocolate Milks. (William Mueller and W. S. Ritchie.) 

 (Dairy Department cooperative with Experiment Station Chemistry.) The 

 details of this project will be found in the reports of the Dairy Department. 



THE CRANBERRY STATION 

 East Wareham, Massachusetts 



H. J. Franklin in Charge 



Injurious and Beneficial Insects Affecting the Cranberry. (H. J. Franklin.) 



Grape Anomala {Anomala errans Fab.). Early in May, 1937, two to three acres 

 of the Santuit bog of the Smith-Hammond Co. in Mashpee were found to be 

 infested seriously with grubs of this insect. Beetles were reared from some of these 

 grubs in June. Many grapevines were growing near the infested bog. This is the 

 third bog that has been found badly affected by this pest during the last few years. > 

 As the species completes its life cycle in a year, the grubs of an infestation do not 

 vary much in size. They look much like those of the cranberry white grub {Phyl- 

 lophaga), but the hind part of the abdomen does not appear dark, because of its 

 contents, as does that of the grub of that species. 



Cranberry Weevil (Anthonomus). Clear, very high-grade pyrethrum dust (made 

 from flowers grown in Kenia), applied on a warm day early in June at the rate 

 of 100 pounds an acre, gave a good kill, thus confirming the results obtained with 

 this material the year before. ^ 



A spray of 15 pounds of derris powder (4 percent rotenone) and one half pound 

 of Areskap in 100 gallons of water, used at the rate of 400 gallons an acre on 

 August 3, failed to give a good kill. 



Fire Beetle {Cryptocephalus incertiis Oliv.). This beetle infested severely and 

 extensively four different bogs — one in Carlisle, one in Lakeville, one in East 

 Middleboro, and one in East Wareham — during the season, thus being far more 

 troublesome than ever before. All but one of the bogs so far known to have been 

 much infested with it have been flooded during the winter but not flowed in 

 June. It has been found attacking severely the foliage of the Howes, HoUiston, 

 Bugle, and Aviator varieties, but does not infest Early Black vines much even 

 where they grow close to other vines badly infested. The beetles feed much more 

 on the upper surface than on the under side of the cranberry leaves and more 

 near the margins than toward the middle of the leaf surface. They also excavate 

 or eat around some of the new terminal buds of the vines and so directly reduce 

 the crop of the following year somewhat. They feed much more in August and 

 early September than later, when they are less active because of the lower tem- 

 peratures. They were also abundant in places on the foliage of the swamp blue- 

 berry,^ black huckleberry,^ and beach plum.'^ 



Clear, high-grade pyrethrum dust (0.9 percent pyrethrin content), applied to 

 an infested bog at the rate of 100 pounds an acre in the middle of a warm day 

 (Sept. 4, 1937) when the beetles were very active, killed less than half of them. 

 A spra}' of 2 pounds of lead arsenate in 100 gallons of water, applied at the rate of 



1 Mass. Agr. Expt. Sta. Bui. 339, p. 36, 1937. 



2 Mass. Agr. Expt. Sta. Bui. 339. p. 37, 1937. 

 ^ Vaccinium corymbosum L. 



^ Gaylussacia baccata C. Koch. 

 ^ Prunus marilima Wang. 



