INSECTS INJURIOUS TO THE STRAWBERRY 



395 



Control. Whenever the plants are not in fruit, the beetles 

 may be destroyed by spraying with 3 pounds of arsenate of 

 lead per barrel, preferably applied with Bordeaux mixture. 

 Where the plants are customarily sprayed with Bordeaux mix- 

 ture for leaf diseases arsenicals may be added and will probably 

 control this and other strawberry pests. Badly infested fields 

 should be plowed under deeply as soon as the crop is secured 

 and new beds should be planted at some distance from them. 



The Strawberry Saw-fly * 



Occasionally the strawberry leaves are skeletonized by yellow- 

 ish or greenish " worms" one-half to three-quarters of an inch 

 long when full grown. The head is yellow with two brown spots 

 on the side and one or 

 two on top, and there 

 are eight pairs of yel- 

 lowish abdominal pro- 

 legs, in addition to the 

 true thoracic legs, 

 which at once disting- 

 uish the saw-fly larvae 

 trom true caterpillars. 

 The adult saw-flies are 

 about one-quarter inch 

 long, with two pairs of 

 blackish, well-veined FIG 

 wings which are folded 

 over the abdomen when 

 at rest. The body is black, with a row of lighter spots on either 

 side of the abdomen. The flies emerge in late April in Missouri or 

 about a fortnight before the plants flower freely. The eggs are 

 inserted just beneath the epidermis of the leaves and hatch in 

 about two weeks, just as the plants begin to bloom. The larva* 

 eat holes in the leaves and " where numerous, they will defoliate 

 the plants to such an extent as to injure greatly or completely 

 destroy the crop of fruit, and may even kill the plants them- 



* Harpiphorus maculatus Norton. Family Tenthredinidce. See J. M. 

 Stedman, Bulletin 54, Mo. Agr. Exp. Sta. 



331. The strawberry saw-fly (Harpiphorus 

 macvlatus Norton): 1, 2, pupa; 3, 5, adult flies; 

 4, 6, larvae; 7, cocoon; 9, egg all enlarged. 

 (After Riley.) 



