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Structure Physiology and Development of Insects
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abdominal segment adults ambrosia beetles antennae aphids Applied control areas attack bark beetles body caterpillars cause cent Cerambycidae cerci characteristics chieﬂy cocoons Coleoptera color commonly conifers CYCLE cylindrical damage defoliation develop Douglas-ﬁr Egg galleries elongate elytra emerge Entomol feed females lay ﬁbrous ﬁne ﬁrs ﬁrst ﬂattened foliage forest insect forest pests Forestry forewings full grown GALLERY PATTERN globular Hemiptera HOSTS AND RANGE hosts grow Hymenoptera inch long infest INJURY inner bark INSECT APPEARANCE insecticides killed larvae larvae bore larval galleries leaf Lepidoptera long when full methods moths mouthparts needles North America oaks occurs pairs prolegs parasites pine posterior powder post beetles presented in Table prolegs pronotum prothorax pupae Pupation reddish SAWFLY scales sclerite shade trees side sometimes species spines spiracles spots spray spring termites thoracic legs thorax tubercles twigs usually weevils wherever the hosts whitish wings wingspread Winter is passed wood borers yellow yellowish