18 



FARMEKS BULLETIN 860. 



Fig. 17.— Cranbpri-y flealieotle : Adult, 

 or beetle. Much enlarged. 



Four or five species are known to 

 be of economic importance to the 

 cranberry, and the fact that an out- 

 break may develop unexpectedly dur- 

 ing any simimer is a strong reason 

 for frequent inspections of the bogs. 

 When at rest among the vines and 

 foliage the worms are difficult of de- 

 tection and it is only when they start 

 into motion that they are readily 

 noted. 



An ordinary insect-collecting net, 

 the appearance of which in the hands 

 of a man afield is often the subject 

 for much merriment, should have a 



place, nevertheless, as part of the equipment of every cranberry bog. 



Sweeping the vines with a net is one of the surest ways of detecting 



an unsuspected insect infestation and this practice will aid in the 



discovery of invasions of spanworms. 



The customary treatment for these insects is the application of a 



spray of arsenate of lead or Paris green. 



ARMY WORM AND FALL ARMY WORM. 



In seascms of army-worm ^ abundance it is not an unusual thing 

 to find these worms infesting cranberry bogs. As a general rule they 

 prefer grasses for food and will feed upon them if the bog is not a 

 clean one, before doing much feeding on the vines. There are times, 

 hoAvever. Avhen the vine feeding becomes a serious matter and a 

 remedy is sorely needed. 



Another Avorm, very similar to the true army worm and known as 

 the fall army worm.^ is likely to cause severe losses on bogs from 

 which the winter flowage is removed in July. The moths advancing 

 northward from the Southern States appear to be attracted to bogs 

 recently bared of the flowage and there they lay their eggs in prefer- 

 ence to adjoining bogs from which the flowage Avas removed at the 

 normal time. 



Where practicable a prompt reflowage, jirefei-ably during cloudy 

 Aveather, Avill suffice to kill or drive either of the above species to the 

 shore, Avhere they may be destroyed by the use of a knapsack sprayer 

 deli\'ering a spray of burning kerosene. Tf reflowage can not be 

 practiced, either the poisoned-bran bait as recommended in this bul- 



CirpJii.s iiiiipiiiicid Haw. 



" Laphtjoma fniijiix-rda S. & A. 



