PLANT PROTECTION 1 – Pests, Diseases and Weeds

PLANT PROTECTION 1 – Pests, Diseases and Weeds
Symptoms on leaves
Fig. 159. Shothole
(Stigmina carpophila)
of cherry. Leaf spots
break away from the
leaf tissue. PhotoCIT,
Canberra (P.W.Unger).
Fig. 160. Fungal leaf spot
of strawberry. PhotoCIT, Canberra
(P.W.Unger).
Fig. 161. Powdery
mildew (Oidium sp.)
of euonymus. PhotoCIT,
Canberra (P.W.Unger).
Fig. 162. Rust (Puccinia
anthirrhini) of snapdragon.
Raised pustules containing
spores develop on leaves
and stems. PhotoCIT, Canberra
(P.W.Unger).
Symptoms on flowers
Fig. 164. Azalea petal blight (Ovulinia
azaleae) disfiguring petals on azalea in wet
weather. PhotoNSW Dept of Industry and Investment.
Fig. 163. Left: Petal blight, grey mould
(Botrytis cinerea) on rose petals. Left: White
spots on pink petals. Centre: Pink spots on
white petals. Right: Brownish
spots on white
petals.PhotoCIT, Canberra (P.W.Unger).
316 Fungal diseases - Biology, identification and classification