PLANT PROTECTION 1 – Pests, Diseases and Weeds

PLANT PROTECTION 1 – Pests, Diseases and Weeds
INDIRECT DAMAGE
Fig. 28. Ribbed case moth.
Pupa, larva and case. PhotoNSW
Dept. of Industry and Investment.
Fig. 29. Leaf case moths showing leaf fragments and
pine needles used to cover their pupal cases. PhotoNSW Dept.
of Industry and Investment.
Fig. 30. Leafcutting bee damage to rose
leaves. Bees cut circular pieces from leaf edges
with their mandibles and use the pieces to line
their nests. PhotoNSW Dept. of Industry and Investment.
Fig. 31. Webbing caterpillar damage to melaleuca.
Caterpillars spin silky webbing which becomes coated
with pellets of excreta and plant debris. PhotoCIT, Canberra
(P.W.Unger).
Fig. 32. Sooty mould fungus on
orange leaf. Black sooty mould grows
on the honeydew excreted by some sap
sucking insects, eg aphids. PhotoNSW
Dept. of Industry and Investment.
Fig. 33. Tomato big bud phytoplasma. Left: Common
brown leafhopper (about 1 mm long) transmits the tomato big
bud phytoplasma. Right: Healthy chrysanthemum on left and
infected plant on right (greening of flower parts). PhotoCIT, Canberra
(P.W.Unger).
34 Insects and allied pests - Plant damage