. Bulletin of the Department of Agriculture. Agriculture. 6 BULLETIN 833, V. 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 annua] orders for : j'nc.^jri--! ^'s 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; G, fl
. Bulletin of the Department of Agriculture. Agriculture. 6 BULLETIN 833, V. 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 annua] orders for : j'nc.^jri--! ^'s 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; G, fly emerging from a gall on right, discarded pupal skin remaining in opening ofgallonleft; F, adult female fly, enlarged about 13 times; /, eggs. (9th Ann. Kept. State Ent. Ind.) TECHNICAL DESCRIPTION.' ^gg [fig. 2, I].—Reddish orange, length .15 mm., diameter .03 mm., the extremities narrowly rounded. Gall [fig. 2, A, B, C, D, GJ.—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).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Department : Supt. of Docs. , Govt. Print. Off.
Size: 1361px × 1837px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
