CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 263 



patches, often causing withering, also preventing flowering or reducing 

 the number of blossoms. Matures in about 17 days. 



Pupa. — Formed in larval mine. This stage lasts about 14 days; 

 puparia dark brown. 



Control. — A solution of Black Leaf 40 and Soap applied at intervals 

 of 10 or 12 days, as soon as first signs of operation of the insect. 



Asparagus Miner (Agromyza simplex Loew.). — ^(Consult Bull. 66, 

 Part I, U. S. Bur. Ent.) Injures asparagus stalks, the maggot 

 mining beneath the epidermis, sometimes girdling the stem. 



Adult. — A black two-winged fly; eyes and head prominent; wings 

 clear with }q inch expanse. Probably two generations, June and 

 August. 



Eggs. — -White; deposited just beneath epidermis of stalk. 



Larva. — -Milk-white; 3^^ inch long; footless, truncate posteriorly 

 and tapering anteriorly. 



Pupa. — Puparium flax-seed-hke, red, i^f inch long; attached to slits 

 in epidermis of asparagus stalk near ground. 



Control. — Pull up and burn infested stalks in spring; destroy 

 volunteer trap plants in late June. 



Com or Spike-homed Leaf Miner (Cerodonta dorsaUs Loew.). — 

 (Consult Bull. 432, Bur. Ent., U. S. Dept. Agr.) This leaf-miner 

 has a wide distribution in the U. S. and feeds on a wide range of 

 cereal and grass plants. Three generations at least in Indiana. 



Adult. — One-twelfth to 3^fo ii^ch long; proboscis, palpi, front, 

 antenn£e, legs, mesonotum and abdomen mostly yellow. Punctures the 

 leaves, in some of which an egg is laid. May in Indiana, but active 

 throughout the year in Pasadena, Cal. 



£gg5.— Elongate, kidney-shaped, rounded at each end. Color 

 opaque white; }-qq inch long. Hatch in 3-12 days. 



Larva. — ^Dirty-white; ^-q inch long; slender, nearly cylindrical; 

 mouth-hooks black; body segments plain; posterior ends truncate; 

 mines in the leaves and stem of host plant, frequently killing the parts 

 affected. Full grown in 9-24 days. 



Pupa. — White at first, turning yellow and dark later. Duration 

 9-24 days. Hibernates (in Indiana). 



Control. — -(i) Summer fallowing, (2) fall plowing, (3) burning dry 

 grasses along fence lines, roadsides, etc. in late fall and early spring. 



