. Control of insects attacking stored tobacco and tobacco products. Tobacco Storage Diseases and injuries. 14 CIRCULAR 6 3 5, U. S. DEPARTMENT OF AGRICULTURE regarded as an important natural control. The adult parasite (fig. 11) is seldom found in large numbers until near the end of the summer, an indication that it survives the winter conditions of storage in compara- tively small numbers. The adults and pupae of this parasite over- winter at or near the surfaces of hogsheads and bales of tobacco and in cracks of walls or ceilings. Since these locations expose the insect to the minimum temper
. Control of insects attacking stored tobacco and tobacco products. Tobacco Storage Diseases and injuries. 14 CIRCULAR 6 3 5, U. S. DEPARTMENT OF AGRICULTURE regarded as an important natural control. The adult parasite (fig. 11) is seldom found in large numbers until near the end of the summer, an indication that it survives the winter conditions of storage in compara- tively small numbers. The adults and pupae of this parasite over- winter at or near the surfaces of hogsheads and bales of tobacco and in cracks of walls or ceilings. Since these locations expose the insect to the minimum temperatures reached in winter and also to fumigants or other insecticides applied in the warehouses, this is an important factor in reducing the number of parasites in tobacco storage houses. Other natural enemies of the tobacco moth are mites of the genus Laelaps, which prey on adults and eggs, and a spider, Theridion tepi- dariorum Koch, which often constructs considerable webbing, in which many moths are captured and destroyed. These mites and spiders. Figure 11.—The braconid Microbracon hebetor, a larval parasite of the tobacco moth, stinging a larvae of the Mediterranean flour moth (Ephestia huehniella), a moth closely related to the tobacco moth. Ten times natural size. (From Doten, Nev. Agr. Expt. Sta. Tech. Bui. 78.) have not been observed in sufficient numbers, however, to indicate an important degree of control. The hymenopterous parasite Mesostcnus gracilis Cress, was collected in many localities in North Carolina and Virginia and is especially abundant in farmers' pack houses. HOW INSECT INFESTATIONS ORIGINATE IN TOBACCO Domestic Flue-Cured Cigarette Tobacco When flue-cured tobacco is packed in hogsheads or cases after being redried, it is free of all living insects. If. however, this tobacco is allowed to remain for even a day or two in any building where tobacco moths or cirgarette beetles are flying, it may become infested. The. Please note that these images are ext
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