CRANBERRY INSECT PROBLEMS. 



17 



ditioiis in New Jersey are 

 so ditierent, however, that 

 a much heavier coat of 

 sand would be required 

 on many of the bogs, 

 oAving to the fact that 

 they were prepared orig- 

 inally without sanding, 

 and that resanding is not 

 a common practice. If 

 sanding is to prove a suc- 

 cess as a control measure, 

 it must be applied thor- 

 oughly, covering all of the 

 litter beneath the vines at 

 least one-half inch. 



REFLOWAGE. 



The usually efficacious 

 method of clearing worms 

 from a bog by reflowage 

 does not meet with success 

 in killing tipworms, be- 

 cause these tiny maggots 

 can Avithstand submerg- 

 ence for a longer period 

 than that during which 

 it is safe to have the 

 growing vines covered. 



Well - nourished vines 

 generally recover better from tip worm injury than weak and ne- 

 glected vines; and from the results of i-ecent experiments there is 

 some reason to believe that an application of com- 

 mercial fertilizer, particularly on savanna land, is 

 helpful in enabling the vines to set buds after a 

 tipworm attack. 



SPANWORMS. 



Looping, or measuring, worms, otherwise 

 known as spanworms, are periodically abundant, 

 but probably are more injurious on Massachusetts 

 l)ogs than on those of any of the other cranberry 

 Pig. 16. — Cranberry sections. Recently in NeAv Jersev thev practically 



tipworm: Adult fly. , , , , " , • . ' . . 



Much L'liiargea. have not been known to cause serious injury. 

 106997°— 17— Bull. 860 8 



Fig. 15. — Cranberry tipworm : Injury to cranberry tip 

 by larvaj. Much enlarged. 



