Titlebook: Crop Pests in the UK; Collected edition of Marion Gratwick Book 1992 Springer Science+Business Media Dordrecht 1992 Coleoptera.Crustacea.Di

單純

tattle

Cereal aphidseaf aphid (. (Fitch)) has been recorded occasionally on barley leaves. The apple—grass aphid (. (Walker)) forms colonies on cereal roots and may assume importance in drought conditions. Vagrant winged forms of other aphids may also settle on cereals for short periods but do not reproduce there.

ARCH

Glasshouse whiteflyr mild winters infestations in glasshouses often originate from these overwintering sources, but the pest can be brought on to the nursery on plants from other sources. A closely related species — the cabbage whitefly (. (L.)) — lives outdoors but only on brassicas and related plants.

Density

Infect

Insubordinate

Willow—carrot aphidlette & Bragg)). The willow—carrot aphid overwinters in the egg stage on willow trees, especially the crack willow (. and the white willow (., and also as an adult or immature stage on host crops that remain in the ground until spring.

厭煩

asional pest of this crop in gardens and unsprayed orchards. The common green capsid . (L.)) is a much more common species and attacks cane and bush fruits, occasionally strawberry, a wide range of shrubs and herbaceous plants and, to a lesser extent, apple, pear and other tree fruits.

corpuscle

RENAL

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