Download A Textbook of Agricultural Entomology by David V. Alford PDF

By David V. Alford

An entire realizing of the biology and existence histories of pest species is essential for all these fascinated about crop creation and crop security. this significant new name offers accomplished assurance of significant insect and mite pest species, basically in Northern Europe. Textbook of Agricultural Entomology is commonly divided into components. the 1st half covers the exterior and inner positive factors of the key insect and mite pest households, whereas the second one half offers distinctive descriptions of significant pest species together with details on lifestyles background phases (vital details while contemplating keep an eye on equipment) and the vegetation which those species assault.

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Fig. 51 Larva of a powdery lacewing, Conwentzia psociformis - family Coniopterygidae (xl5). and large, toothed mandibles. Pupation occurs within a silken cocoon. 3i Fig. 52 Forewing venation of a brown lacewing family Hemerobiidae. Fig. 53 Larva of a brown lacewing, Hemerobius humulinus - family Hemerobiidae (x7). Coniopteryx tineiformis, Conwentzia pineticola, Semidalis aleyrodiformis. EXAMPLES: 1. Family CONIOPTERYGIDAE (powdery lacewings) 2. Family HEMEROBIIDAE (brown lacewings) Small, delicate, whitefly-like lacewings with white, mealy wings; hindwings sometimes vestigial; venation reduced and with few cross-veins, the veins not bifurcating near the wing margin (Fig.

66 Antenna of a clavicornid beetle - family Nitidulidae. in northern Europe found only in imported grain. EXAMPLE: Rhyzopertha dominica (larva = lesser grain borer). Superfamily CLEROIDEA 11. Family TROGOSSITIDAE A mainly tropical family of often predatory beetles; antennae clubbed; tarsi 5-segmented, the basal segment small, the apical segment relatively long and bearing a small lobe, visible ventrally between the claws. The European fauna includes a minor pest of stored food products, which is also partly predacious on other pests.

EXAMPLE: Byturus tomentosus (raspberry beetle). 17. Family COCCINELLIDAE (ladybirds) (p. 137) Small to medium-sized, usually convex, hemispherical to oval beetles; head retracted into the pronotum; eyes large; antennae terminating in a 3-segmented club; mandibles bidentate apically (Fig. 70) (= predacious species - subfamily Coccinellinae) or with more than two apical teeth (= phytophagous species - subfamily Epilachninae); legs short; elytra often black, red or yellow, with a contrasting pattern of spots or blotches; tarsal formula 4-4-4.

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