. Injurious insects : how to recognize and control them . Insect pests; Insect pests. VAICE OF PARASITES 49 ture is found unfiiA-oralile to an essential parasite ; or it is ilisco\'ered that in its new home the parasite itself is attacked by some enemy from which it was free in its native land. Rarely, however, the experiment is successful; and the few instances that do work out satisfactorily abundantly repay for the labor and cost of all. The most extensive attempt at the introduction of parasitic and predacoous enemies from abroad for the control of a menacing- pest is that now in progress,
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. VAICE OF PARASITES 49 ture is found unfiiA-oralile to an essential parasite ; or it is ilisco\'ered that in its new home the parasite itself is attacked by some enemy from which it was free in its native land. Rarely, however, the experiment is successful; and the few instances that do work out satisfactorily abundantly repay for the labor and cost of all. The most extensive attempt at the introduction of parasitic and predacoous enemies from abroad for the control of a menacing- pest is that now in progress, under the auspices of the Bureau of Entomolog>- of the United States Department of Agricul- ture, in the fight against the gypsy moth. At least ten or twelve species must be col- lected, imported, and colo- nized successfully, in order to make this work a complete success ; but there is excellent prospect of ultmiate accom- plishment ; and meanwhile, no other known measures will avail to limit the ra\ages of the pest. .Among our ^â aluaI1le families of predaceous insects are the ground beetles, tiger beetles, and lady-bird beetles in the order Coleoptera; the assassin bugs and many aquatic forms in the order Hemiptera ; the dragon flies constituting the order Odonata ; and se\'eral families in the two-winged flies or Diptera. Two orders furnish the of our parasitic .species, the Diptera and the H^nBenoptera. The number of parasites within these orders is enormous. The principal families include the Tachina flies and the S^Tphus flies in the Diptera, and the Ichneumons, Braconids, and Chalcids in the :. 53. â JLggs oi i'hr//.sopa sp. Prrdaceous on plant lice. Enlarged. 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 O'Kane, Walter Collins, b. 1877. New York : The Macmi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1912
