280 The Spraying of Plants. 



hanging upon the plant. The foliage is also affected, distinct 

 brown areas appearing upon the leaves. The disease is most 

 troublesome during warm, moist seasons. 



Treatment. It has been recommended to sand the bog to the 

 depth of an inch as a partial remedy. Keeping the bog as dry 

 as possible during the summer months is supposed to be of ser- 

 vice. The use of properly applied fungicides appears promis- 

 ing, but the value of these cannot yet be told. 



INSECT ENEMIES. 



Fire-worm; Cranberry-worm; Vine-worm; Blackhead (Rhopo- 

 bota vacciniana, Packard) . Description. The moths lay eggs 

 on the under side of the leaves during the fall. These do not 

 hatch until the following spring, the young larvae appearing 

 during the latter part of April or in early May. The moths 

 appear early in June, laying their eggs about the middle of the 

 mouth. The grown larvae have jet-black heads, the body being 

 green and having fine hairs scattered over the surface. They 

 feed upon the young leaves, and draw these together by means 

 of silken threads. The moths are grayish-brown, lighter col- 

 ored bands extending across the fore wings; the hind wings are 

 dull brown. There are two broods. 



Treatment. The bogs may be flooded after the eggs have 

 hatched, in this manner drowning the larvae. Some growers 

 prefer to spray the bogs at this time with tobacco water. Kero- 

 sene emulsion might answer the same purpose. 



Arsenites, if applied early and thoroughly, have been effectual 

 in destroying these insects. Cranberry foliage appears to be 

 susceptible to injury from these poisons, so that lime should be 

 added. Two quarts of glucose or molasses are said to increase 

 their effectiveness. 



Fruit-worm (Acrobasis Vaccinil, Elley). Description. The 

 moths appear early in July and lay their eggs upon the small 

 cranberries, generally at the blossom end. The eggs are small, 

 flat, and light yellow in color. They hatch in about a week, 

 producing a little greenish worm, which, when mature, is about 

 half an inch in length. These larvae first feed a day or two upon 

 the outside of the berry, after which they enter the fruit, hol- 

 lowing it out, and then another berry is attacked. The larvae 

 do not pupate till fall, passing the winter in this condition. 



