. Insect pests of farm, garden and orchard . nue to feed in the field and become full grown and pupatewhere by the destruction of their food this might be prevented. 234 INSECT PESTS OF FARM, GARDEN AND ORCHARD Natural Enemies.—Very frequently worms are found coveredwith what seem to be small, white eggs. These are not eggs, how-ever, but are the small silken cocoons of a little wasp-like parasite(Apanteles congregatus) whose larvae feed internally upon thejuices of the worm and thus ultimately kill it before it transformsto a pupa. Such parasitized worms should never be destroyed,as the paras
. Insect pests of farm, garden and orchard . nue to feed in the field and become full grown and pupatewhere by the destruction of their food this might be prevented. 234 INSECT PESTS OF FARM, GARDEN AND ORCHARD Natural Enemies.—Very frequently worms are found coveredwith what seem to be small, white eggs. These are not eggs, how-ever, but are the small silken cocoons of a little wasp-like parasite(Apanteles congregatus) whose larvae feed internally upon thejuices of the worm and thus ultimately kill it before it transformsto a pupa. Such parasitized worms should never be destroyed,as the parasites are of more value than the damage the wormmight do. Very frequently the caterpillars are attacked by a bac-terial disease which causes them to turn dark and become shrunkenand flaccid. The Budworms * Two caterpillars of the same genus commonh attack the budof tobacco and have been distinguished by Dr. L. 0. Howard asthe true bud worm and false bud worm, the latter being the sameas the well-known cotton ]>olhvorm and corn Fig. 167.—The true budworm {Chloriden viresccns): n, adult moth; h, full-grown larva, from side; c, same, from above; d, seed-pod l)ored into bylarva; e, pupa—natural size. (After Howard, U. S. Dept. Agr.) The true Ijudworm {Chloridea virescens) occurs in the moresouthern portions of the toljacco-growing regions, says Dr. How-ard, t but has not been noted in tobacco-fields north of adult insect is a small greenish moth, well illustrated inFig. 167. The larva or caterpillar of this moth, also illustrated, is * Chloridea virescens Fab., and Heliothis obsolcta Fab. Family A^ociM?( Farmers Bulletin 120, U. S. Dept. Agr. The Principal Insects Affectingthe Tobacco Plant. INSECTS INJURIOUS TO TOBACCO 235 nearly alwa}s found in the bud of the tobacco-plant about thetime the plant is ready to top. In some seasons they occur inlarge numl)ers and damage the tobacco considerably. In theeai-h part of the season, as a general thing,
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