. Manual of fruit insects. Fig. moth,berries. - Cluster of green Concord grapes badly infested by the grape-Note the discoloration and the cracking open of the infested References Cornell Agr. Exp. Sta. Bull. 223. Agr. Exp. Sta. Circ. 63. 1906. The Grape-blossom MidgeContarinia johnsoni Slingerland This grape pest was first discovered in the Chautauqua graperegion of western New York in 1904, and as far as known isstill confined to that locality. A closely related species causes 438 FRUIT INSECTS. a similar injury tograpes in presence in avineyard is first in-di
. Manual of fruit insects. Fig. moth,berries. - Cluster of green Concord grapes badly infested by the grape-Note the discoloration and the cracking open of the infested References Cornell Agr. Exp. Sta. Bull. 223. Agr. Exp. Sta. Circ. 63. 1906. The Grape-blossom MidgeContarinia johnsoni Slingerland This grape pest was first discovered in the Chautauqua graperegion of western New York in 1904, and as far as known isstill confined to that locality. A closely related species causes 438 FRUIT INSECTS. a similar injury tograpes in presence in avineyard is first in-dicated by abnor-mally enlarged, yel-lowish or darkreddish blossombuds (Fig. 378)which fail to openand drop off aboutthe normal time forblossoming. Open-ing one of these Fig. 378. — Enlarged blossom buds infested with j u J midge larvaj, normal blossom buds at the right. enlarged DUClS, It will be found tocontain a number of small whitish or yellowish maggots fromtV to tV inch in length (Fig. 379). From 10 to 60 per cent ofthe buds are some-times destroyed,giving the clustersa very thin andragged appearance,and thus decreas-ing considerably themarket value of thecrop. The parent insectis a delicate two-winged midge witha yellowish bodyand straw coloredlegs (Fig. 380). The
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