12 



FARMERS BULLETIN SGO. 



Fig. 9. — Tellowhoad 

 fireworm : Aloih. or 

 parent insect, gray 

 form. Much en- 

 largied. 



by liokling the winter tlowage one season nntil 

 May 10. If this is done, the wintering moths 

 will be compelled to lay their eggs on the up- 

 land, and very rarely will the worms of the 

 succeeding generations work their way back to 

 tlie bogs. 



Parts of b<tgs that can not be winter-flowed 

 ai-e undesirable holdings and are better if left 

 unplanted. They serve as bi-eeding places for a 

 number of undesirable insects. 



SPRAYING. 



Arsenical poisons are repined to be more effec- 

 tive against yellowheads than against blackheads. 

 Arsenate of lead at the rate of from 3 to 5 

 pounds of the paste to 50 gallons of water is 

 recommended for application as soon as newly 

 hatched worms are discovered. In view of the 

 surprising success obtained in the control of the latter worms with 

 40 per cent nicotine sulphate, however, the suggestion is offered that 

 growers who have dry bogs infested with yellowheads spray them 

 twice at intervals of a week just before 

 new leaves begin to appear at the tips of 

 the uprights, using 40 per cent nicotine 

 sulphate (1 to 800) at the rate of '200 gal- 

 lons per acre. (See directions for prepa- 

 ration of nicotine sulphate, p. 0.) 



RED-STRIPED FIREWORM.' 



At the time of the publication of Farm- 

 el's' Bulletin ITS, " Insects Injurious in 

 Cranberry Culture." it was thought that 

 the red-striped individuals noted among 

 infestations of yellowhead fii-eworms were 

 simply a variety of the latter species. 

 This conclusion has been sliown to be 

 erroneous, and in both Massachusetts and 

 New Jersey it has been found that the 

 red-striped worms develop into moths of 

 a distinct species. 



This pest will be found almost invari- 

 ably along with yellowhead infestations, 

 the conditions for one being suitable for 

 the development of the other. It is essen- 



Fio.. 10.- 

 Moth 

 orange-red form 

 larged. 



Yellowhead fireworm : 

 or parent insect. 



Oclcrhia trialbomaculcUa Cham. 



