6 



BULLETIN" 833, U. S. DEPARTMENT OF AGRICULTURE. 



From these data it is apparent that the insect is a serious pest, 

 especially in cases where growers require from 50,000 to 100,000 plants 

 for their own use and five to ten times this number to fill annual 

 orders for shipment. 



Fig. 2.— The chrysanthemum midge: A, Leaf covered with galls; B, a single gall, more enlarged; C, gall 

 cut open from above, showing young larva within; D, two galls cut in vertical section; E, larva, enlarged 

 about. 13 times; F, pupa; <?, fly emerging from a gall on right, discarded pupal skin remaining in opening 

 ofgallonleft; H, adult female fly, enlarged about 13 times; 7, eggs. (9th Ann. Rept. State Ent. Ind.) 



TECHNICAL DESCRIPTION. 1 



Egg [fig. 2, I]. — Reddish orange, length .15 mm., diameter .03 mm., the extremities 

 narrowly rounded. 



Gall [fig. 2, A, B, C, D, G]. — Conical swelling projecting obliquely from the surface. 

 Size about 2 mm. in length. Color, generally green. Reddish green when growing 

 outside and depending on variety affected. Tips appear dried out and grayish at 



•Technical description of egg, larva, pupa, male, and female taken from Felt (20). 



