Plant Protection 3 : Selected Ornamentals, Fruit and Vegetables

ANNUALS AND HERBACEOUS PERENNIALS
Fig. 4. Bacterial leaf spot and stem
rot (Xanthomonas campestris pv.
pelargonii) of ivy-leaved geranium.
Dept. of Agric., NSW.
Fig. 5. Downy mildew of stock
(Peronospora parasitica), patches
of greyish mildew on leaf undersurfaces.
Dept. of Agric., NSW.
Fig. 6. Grey mould, petal spot (Botrytis
cinerea) on rose petals, each spot
represents where a spore has germinated.
Fig. 7. Fungal leaf spot or ink spot
(Alternaria alternata) of kangaroo
paw.
Fig. 8. Powdery mildew
(Oidium sp.) on zinnia
leaves. Dept of Agric., NSW.
Fig. 9. Left : Rhizoctonia collar rot
(Rhizoctonia solani) of stock. Dept. of Agric.,
NSW. Right : Sclerotium stem rot (Sclerotium
rolfsii) of sunflower, note tiny sclerotia.
Fig. 10. Rust pustules (Puccinia
malvacearum) develop on stems
as well as on leaves of hollyhock.
Fig. 11. Root knot nematode
(Meloidogyne spp.) galls on the
roots of tomato. Dept. of Agric., NSW.
Fig. 12. Aphids (Aphididae) are
1-3 mm long and common pests,
they cause distortion of new
growth and spread virus diseases.
A 2
ANNUALS AND HERBACEOUS PERENNIALS