CAPE COD CRANBERRY INSECTS 



63 



Cranberry Tipworm.'"' 



Vigorous vines very often recover from tlie attack of tliis insect and yield 

 well the next year. Those that fail to do so might have Ijeen unproductive 

 anyway. In view of tiiis and of the fact that the effect of light or heavy 

 cropping is carried over in the vines from one year to another, it is hard to 

 say just how harmful the pest really is, but it tends to reduce crops and should 

 be controlled. It infests flowed bogs much more than strictly dry ones and 

 tends to attack Howes vines more than Early Black. Flooding kills or drives 

 ashore many of its natural enemies and may protect the hibernating worms 

 from winter severities. Frost often reduces an infestation greatly when it 

 kills the cranberry tips. 



Fig. 61. Cranberry Tipworm. Cranberry uprights attacked by both broods, the 

 branching of the tops being due to the work of the first, the cupped 

 tips to that of the second. 



Dh-trUiKtiou ainJ Food Plants. 



The tipworm is al)undant wiiere\er cranberries are grown, causing concern 

 in Massachusetts, New Jersey, Wisconsin and on the Pacific coast. It has 

 been said to infest other heaths and loosestrife"'. 



Character of Iiijiiri/. 



The first l)r()od of maggots works mostly during the first half of June. It 

 does little harm for it is seldom very abundant and the vines have time to re- 

 cover. The second brood is much more plentiful and generally appears wlien 

 the vines are in full bloom. Its work is more serious for it interferes with 

 the development of tiie terminal buds tiiat should produce the blossom-bearing 

 growtli the next year. 



Both broods work wholly among the leaves at the tips of the uprights and 

 runners. Tiiese become cupped and bimched together characteristically (fig. 

 59). This is due to the feeding of the worms on tlieir inner surfaces which 

 they rasp with a little horny process on the under side of the body. The 

 inner leaves die (fig. 60) and sooner or later break off. New growth' repairs 

 the inj)iry done by the first brood (fig. 61). Side buds usually develop in 



66. Dasyneura vatcinii (Smith) 



67. Lysimachia sp. 



