62 



FARMERS BULLETIN 856. 



Control. — The following measures may be taken: Avoid planting 

 in or near ground in which this species has occurred. Plant early 



I'lG. 72. — The coninion squash l)Ug (Anasa tristis) : a, Newly hatched nymph; b, second- 

 stage nymph ; c, thiid-stas?e nymph ; d, fourth-stase nymph ; c, fifth-stage nymph ; 

 f, adult ; f/, egg mass. All about twice natural size. 



varieties of squash for a trap. Harrow the fields lightly in the fall, 

 and plow deeply in the spring, to prevent the moths from issuing. 

 Encourage the for- 

 mation of secondary 

 roots by covering 

 infested stems with 

 earth. Destroy 

 dead vines and old 

 plants as soon as 

 the crop is made or 

 whenever it becomes 

 badly damaged. 

 Keep plants in a 

 vigorous condition, 

 free from other 

 insects and disease. 

 Cut out borers if 

 possible. Capture ^*^^' 

 moths in sweep nets toward 

 " The Squash-Vine Borer." 



Fig. 73. — Squash-vine borer (MeJittia satyriniformis) : 



moth ; b, female, with wings folded at rest ; c, eggs shown 

 on bit of squash stem ; d, full-grown larva, in situ in vine : 

 e, pupa ; f, pupal cell. All one-third larger than n.itural 



dark. Consult Farmers' Bulletin GCxS, 



