PLANT PROTECTION 1 – Pests, Diseases and Weeds

PLANT PROTECTION 1 – Pests, Diseases and Weeds
Piercing and sucking damage
Fig. 14. Apple leafhopper damage to crabapple leaves.
Left: Healthy foliage Right: Foliage spoilt by leafhoppers.
PhotosNSW Dept. of Industry and Investment.
Fig. 15. Apple leafhoppers resting
on the undersurfaces of apple leaves
(50% natural size). PhotoNSW Dept. of
Industry and Investment.
Fig. 16. Green peach aphid damage. The sucking of the
aphids causes leaves to curl. Do not confuse with the fungal disease
peach leaf curl (page 358). PhotoCIT, Canberra (P.W.Unger).
Fig. 17. Greenhouse whiteflies on the
undersurfaces of a tomato leaf.
PhotoCIT, Canberra (P.W.Unger).
Fig. 18. Lerps on eucalypt foliage. Discolored areas of the leaf
develop where lerps have been feeding. PhotoCIT, Canberra (P.W.Unger).
Fig. 19. Acacia-spotting bug damage to
Acacia leaves. Left: Damage to leaves with no
marked veinal structure. Right: Damage to
leaves with a marked veinal structure.
Insects and allied pests - Plant damage 31