CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 195 



Green Clover Worm {Plathypena scabra Fab.) (Consult Farmers' 

 Bull. 982, U. S. Dept. Agric). A pest of alfalfa and the leguminous 

 crops of eastern U. S. and southern Canada. 



Adult. — Variegated dark brown to black; wing expanse i}^ inches, 

 2-4 generations a season. Hibernates. 



Eggs. — Circular, slightly flattened; green; about the size of a pin 

 head. Female lays between 200-600 eggs in a few days singly on 

 the underside of the leaf. Hatch in about four days. 



Larva. — Green, with a narrow white stripe and second fainter 

 white line on each side; 1^4 inches long; only four pairs of pro-legs; 

 5 moults; restless and drops off the plant when disturbed. Mature 

 in about 4 weeks. 



Pupa. — -Yellow-brown or black, formed in a loose oval base or 

 cocoon of debris webbed together; duration about 8 days. Some- 

 times hibernates. 



Control. — Cut the crops when the caterpillars are most abundant; 

 adopt clean culture; use hopperdozer in bad outbreaks. 



Hop Vine Looper or Snout Moth {Hypena humuli Harris) . — This 

 noctuid sometimes does serious injury to the leaves of hop. Two 

 broods a year. 



Adult. — A dark brown moth, 13^2 inches wing expanse, with irregular 

 and variable transverse markings on fore wings; palpi long, flattened, 

 and projecting horizontally like a snout. July and August-September; 

 hibernates. 



Eggs.—Fsile green; laid on the under side of the leaves. 



Larva. — -A semi-looper, lacking the first pair of prolegs; green; 

 with two longitudinal white lines along the back, a dark green line 

 between and an indistinct whitish line on each side; head green spotted 

 with black piliferous dots. Spins a thin silken cocoon before pupating. 



Pupa. — ^Formed in the ground, in crevices in the poles, and in the 

 leaves. Duration about 10 days. 



Control. — Spray or dust vines with arsenate of lead. 



(e) Com Ear Worm (Heliothis obsoleta Fab.) 



Adult. — An ochre-yellow moth with blackish markings, expand- 

 ing about 1 3-^ inches. 



Eggs. — Small yellow circular flattened disks, prettily corrugated 

 by ridges radiating from the centre. 



