Amaranthus diseases A lecture on ToT training of FFS By Mr Allah Dad Khan Provincial Coordinator IPM KPK MINFAL Islamabad

2. Amaranths diseases
A
Lecture To ToT trainees (
FFS)
By
Mr. Allah Dad Khan
Provincial Coordinator IPM
KPK
MINFAL Pakistan

7. Damping-off Rhizoctonia spp.
Pythium spp.
• Symptoms
• Poor germination; seedling collapse; brown-black lesions
girdling stem close to soil line; seedling fail to emerge from
soil
• Cause
• Fungus
• Comments
• Disease emergence favors wet soils
• Management
• Avoid planting seeds too deeply; do not plant seeds too
thickly to promote air circulation around seedlings; do not
over-water plants

8. Wet rot (Choanephora rot)
Choanephora cucurbitarum
• Water-soaked lesions on stems; lesions have hairy appearance due
to presence of fungal spores; may cause loss of leaves
• Cause
• Fungus
• Comments
• Fungus mainly attacks plants that have been damaged by insects or
by mechanical means; spread by air currents and via infected seed;
disease emergence favors warm, moist conditions
• Management
• Plant varieties resistant to disease; only use certified seed; do not
plant crop densely; treat disease with copper fungicides if it
emerges
•

9. Anthracnose
Colletotrichum gloeosporioides
• Necrotic lesions on leaves; dieback of leaves
and branches
• Cause
• Fungus
• Comments
• Management
• Avoid damaging plants and creating wounds
for pathogen to enter; plant resistant varieties
• Symptoms