396 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



selves." When at rest or disturbed the larvae coil themselves up 

 in a spiral on the under side of the leaf as shown in Fig. 331, but 

 if suddenly disturbed they will often drop to the ground. By 

 the last of May the larvae are full grown and enter the soil, where 

 they make small cells, lined with a gummy substance, and in them 

 hibernate until the next spring, when they pupate and the adult 

 flies emerge. 



Injury by the saw-fly has been reported from the "Northern 

 and Central States from Missouri and Nebraska to Maine. 



A nearly related species * with almost identical habits has 

 done similar injury in Iowa, Illinois and Indiana. The larvae 

 are a deep green, much wrinkled, with a blackish stripe along 

 the back and an obscure blackish stripe on each side, and the 

 head brown. 



Control. Inasmuch as the larvae commence to hatch just as 

 blooming commences Professor Stedman has shown by experi- 

 ments that spraying the foliage at this time with arsenicals will 

 entirely protect it from the larvae. If they commence work 

 before their presence is noticed, the foliage may be sprayed 

 until the first berries are about one-third grown without any 

 danger of poisoning them. Hellebore, 1 pound to 3 gallons of 

 water was also effective, as was dusting with pyrethrum. 

 Although there may be some prejudice against the use of arsen- 

 icals, where properly applied at the right time there is no reason 

 why they should not be used. 



The Strawberry Leaf -roller f 



Where leaves are found folded together, many of them being 

 dry and brown, the small green caterpillars found feeding within 

 the folds are probably those of the Strawberry Leaf-roller. It 

 is a European insect, though it is not injurious there, and the 

 first record of injury in this country was made by Dr. C. V. 

 Riley in 1869, who stated that in one place in Missouri it destroyed 

 ten acres so completely as not to leave enough plants to set a 

 half acre. "Since that time," says Dr. J. B. Smith, "the insect 

 has been frequently mentioned as injurious in many parts of the 



* Monostegia ignota Norton. See F. W. Mally, "Insect Life," Vol. II, 

 p. 137. 



t Ancylis comptana Frohl. Family Tortricidce. See J. B. Smith, Bulle- 

 tins 149 and 225, N. J. Agr. Exp. Sta. 



