Diseases of Custard apple.pdf

Diseases of Custard apple

1. Siddu Lakshmi Prasanna
Course No.: PATH 2.7.1.
CourseTitle:DiseasesofFruit,Plantation,Medicinal
andAromaticcrops
By
Dr. SidduLakshmi Prasanna
Ph. D (Agri.)
Dept.ofPlantPathology

2. Custard apple
Sr. No. Disease Causal organism
1.Anthracnose Colletotrichum
gloeosporioides
2.Glomerellafruitrot Glomerellacingulata
3.Leaf spot Cylindocladiumcolhounii
4.Diplodiarot Botryodiplodiatheobromae
5.Black canker Phomopsisannonacearum
6.Spiral nematode and
Stunt nematode
Helicotylenchussp.
Tylenchorhynchusclaytoni
Scientificname:Annonasquamosa
Siddu Lakshmi Prasanna

3. Anthracnose/Fruit Rot
Causal organism: Colletotrichum gloeosporioides
Telomorph: Glomerellacingulata
SYMPTOMS:
Leaves:Darkmarginwithgreyishcenterandasdiseaseprogressesthecenter
regionfallsoffanddirtygreyishcolourindicatesthepresenceofacervulus.
•Infectionbeginsatblossom-endofthefruitandlaterspreadsonentirefruit
surface,affectedfruitsshrivelandtheymayclingtothetreeorfall
down.
Siddu Lakshmi Prasanna

4. •Necroticspotsof2-10mmindiameterappearonunripefruitswhich
turnintodarkbrowntoblackspots.Thesespotscoalescelaterandcover
entirefruit.
Siddu Lakshmi Prasanna

5. Epidemiology:
•Wetandwindyconditionsfavorsthedisease
•Temperature28-32°C
Primary source of inoculum: Older fruits left on the trees provide inoculum
for disease spread. Conidia present in infected plant debris
Secondary source of inoculum: air borne conidia
Siddu Lakshmi Prasanna

6. Diseasecycle
Siddu Lakshmi Prasanna

7. Management:
Cultural methods:
•Usemulchingunderthetreestoreducesoilsplash.
•Removedeadtwigsandmummifiedfruits.
•Prunethetrees50cmaboveground.
•Avoidplantingsusceptiblevarieties.
Chemical methods:
•[email protected]%[email protected]%
Siddu Lakshmi Prasanna