A Textbook of Agricultural Entomology by David V. Alford

By David V. Alford

A whole figuring out of the biology and lifestyles histories of pest species is essential for all these fascinated by crop construction and crop safety. this significant new identify offers finished insurance of significant insect and mite pest species, essentially in Northern Europe. Textbook of Agricultural Entomology is greatly divided into components. the 1st half covers the exterior and inner positive aspects of the most important insect and mite pest households, whereas the second one half offers distinct descriptions of significant pest species together with info on lifestyles historical past phases (vital info while contemplating keep watch over tools) and the plants which those species assault.

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In view of these difficulties, and to avoid ambiguity, a solidus (forward slash) is used in the present work to delineate primary and secondary hosts in such common names. Order HEMIPTERA (True Bugs) 27 of different morphs and alternation of host plants. EXAMPLES: Adelginae - Adelges abietis and A. viridis (spruce pineapple-gall aphids); Pineinae - Pineus pini (Scots pine adelges). Fig. 41 Antenna of an alate aphid - subfamily Pemphiginae. 22. Family PHYLLOXERIDAE (phylloxerans) (p. 123) A small group of insects, structurally similar to adelgids but alates with just three antennal segments and wings held flat when in repose; wax (if present) never flocculent.

Family MICROPTERIGIDAE A small group of minute, day-flying moths with narrow, pointed wings; wings with a metallic sheen. Although at least one species (Micropterix calthella) is often abundant in grass meadows on flowers of Ranunculus, the insects are not of pest status; adults feed on pollen and the larvae on mosses and liverworts. Suborder DACNONYPHA Adults without functional mandibles; wings aculeate; forewings with a fibula; hindwings with costal spines. Larvae apodous. Pupae exarate, with large, curved mandibles.

19. Family APHIDIDAE (aphids) (p. ) Aphids with the terminal process of the antennae of variable length; compound eyes multi- 26 The Main Groups of Insects and Mites Fig. 38 Cauda and bilobed subanal plate - family Drepanosiphidae. Fig. 40 Venation of an alate aphid - subfamily Pemphiginae. Myzus persicae (peach/potato aphid),2 Rhopalosiphum padi (bird-cherry aphid), Sitobion avenae (grain aphid). 20. Fig. 39 Venation of an alate aphid - family Aphididae. faceted; siphunculi varying from short to very long cylinders, sometimes noticeably tapered or swollen and often flanged apically; cauda broadly tongue-shaped to finger-shaped; Rs vein of forewing present, forewings and hindwings with Cu t and Cu2 and origins of these veins well separated (Fig.

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