46 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 2 



Mr. Fernald : A word of explanation is perhaps due to account 

 for my presenting this paper. The work on this subject was done 

 in Massachusetts by Dr. Franklin before he went to Minnesota, and, 

 through the kindness of Professor Washburn, it has been sent to me, 

 simply because I represent the state where the work was done. 



NOTES ON CRANBERRY PESTS 



By Henry J. Franklin, Saint Anthony Park, Minn. 



In studying the life histories of various cranberry bog insects on 

 Cape Cod during the season of 1907, certain interesting points were 

 discovered concerning the life history of Peronea minuta (Robinson) 

 which do not appear to have been published. This insect is two- 

 brooded in Massachusetts and three-brooded in New Jersey. The 

 winter brood of moths in Massachusetts are slate gray in color, but 

 the summer brood are orange red. In New Jersey also, the winter 

 brood is slate gray, but the two summer broods are both orange red 

 in color. 



The fact that the species is dimorphic in the adult state has been 

 long recognized, and Prof. J. B. Smith has recorded (Farmers' Bui. 

 No. 178, U. S. Dept. Agric, p. 13) a marked dimorphism on the part 

 of the larvae. Speaking of the last brood of worms in New Jersey 

 he says: ''Eggs laid by these moths" (those of the last summer 

 brood) "do not hatch until in August or even early September, and 

 the worms that come out of them grow slowly as compared with the 

 earlier broods. Few of them spin up more than a single shoot, and 

 few of them eat into any but the smallest berries. They also tend to 

 become reddish in color and even striped, so that at one time they 

 were believed to form a distinct species, described as the 'red-striped 

 cranberry worm. ' " In this we find a difference not only in color, but 

 also in habit, as the worms of the other two broods are pale yellow in 

 color and those of at least one of these broods usually draw together 

 a number of shoots in a single web and eat into the fruit voraciously. 

 In Massachusetts as well as in New Jersey this last brood of worms, 

 which later changes into the winter brood of moths, has a tendency 

 to "become reddish and even striped" and grows slowly as compared 

 with the caterpillars of the other brood. In Massachusetts, however, 

 this brood of worms is the one which is often very injurious to the 

 vines and the berries. This difference in habit between Massachu- 

 setts and New Jersey is doubtless due to the fact that the cranberry 



