488 INSECT PESTS OP FARM, GARDEN AND ORCHARD 



widely distributed, occurring from New England to Minnesota 

 and Colorado, in British Columbia, and probably in the 

 Pacific States. The larva is about two-thirds the size of the 

 imported species, but is uniformly pale-green except the head 

 which* is black until the last molt, after which it becomes partly 

 green. One generation of larvaB appears in late June and another 

 in August. The cocoons are usually attached to the twigs or 

 leaves of the bushes. The female saw-fly is dull black with dull 

 yellow head, and honey-yellow legs. 



Control. While fruiting the foliage should be dusted or sprayed 

 with hellebore, which is the time-honored remedy for currant- 

 worms (p. 47). However, before the fruit has set and after it 

 is picked, spraying with arsenicals will be much cheaper and more 

 effective, and as it is often desirable to spray gooseberries for 

 diseases with Bordeaux mixture, by adding arsenate of lead or 

 Paris green to it, the worms may be easily controlled. 



The Currant Span-worm * 



The Currant Span-worm is readily distinguished from the other 

 currant " worms," by being one of the measuring-worms or inch- 

 worms which loop along as shown in Fig. 351. It is not frequently 

 very destructive, but occasionally becomes a pest, more par- 

 ticularly of black currants and gooseberries, throughout the 

 eastern half of the country. The caterpillar is slightly over an 

 inch long when full grown, and of a whitish color with a wide 

 yellow stripe down the back, another along each side, and several 

 black spots on each segment. The under side is white with a 

 slight pinkish tinge, with a broad yellow median stripe, and is also 

 spotted with black. The moth has a wing expanse of about 1 

 inches, is a pale yellowish color, with several brownish spots, 

 varying in size and sometimes forming one or two irregular bands 

 across the wings. 



Life History. The eggs (Fig. Sola) are laid in midsummer on 



* Cymatophora ribearia Fitch. Family Geometridce. 



