LEAF SPOT or BLACK SPOT

2. SUBMITTED TO
Dr. (Mrs.) SHASHI TIWARI
Dept. of Plant Pathology
Naini Agriculture Institute
SHUATS, Prayagraj.
SUBMITTED BY
Name :- DWIGPAL SHAHI
PID :- 18BSCAGH128
Section :- B Semester :- 5th
Programme :-B.Sc.(Hons.)Agriculture

3. INTRODUCTION
INTRODUCTION
LEAF SPOT OR BLACK SPOT OF PAPAYA
LEAF SPOT OR BLACK SPOT OF PAPAYA
LEAF SPOT OR BLACK SPOT OF PAPAYA
LEAF SPOT OR BLACK SPOT OF PAPAYA
CAUSAL ORGANISM
CAUSAL ORGANISM
SYMPTOMS
SYMPTOMS
MODE OF SPREAD
MODE OF SPREAD
DISEASE CYCLE
DISEASE CYCLE
MANAGEMENT
MANAGEMENT

5. LEAF SPOT OR BLACK SPOT OF
LEAF SPOT OR BLACK SPOT OF
PAPAYA
PAPAYA
• Asperisporium caricae is
an ascomycets fungus that is a plant
pathogen found in north and south
america . it is responsible for the leaf
spot or black spot disease on
spot or black spot disease on
papaya trees. it affects generally leaves
at any time. Sporodochia
of Asperisporium caricae was growing
under side of leaf, dark blackish brown
to black, stroma well-
developed, erumpent.
Asperisporium caricae

6. CAUSAL ORGANISM
CAUSAL ORGANISM
• Domain: Eukaryota
• Kingdom: Fungi
• Phylum: Ascomycota
• Subphylum: Pezizomycotina
• Class: Dothideomycetes
• Class: Dothideomycetes
• Subclass: Dothideomycetidae
• Order: Capnodiales
• Family: Mycosphaerellaceae
• Genus: Asperisporiu
• Species: Asperisporium caricae

7. SYMPTOMS
SYMPTOMS
• The initial symptoms are water-soaked spots on the upper leaf
surface.
• Later, small, black , brown or yellow spots are visible on the
underside of the leaf.
• As the disease progresses, small black spots (spores) can be seen
on the underside of leaves.
on the underside of leaves.
• On the upper surface, the lesions are rounded or somewhat
angular, 1-4 mm in diameter, pale yellow, with dark margins.
• If leaves are severely infected, they turn brown and die. When
leaves die off extensively, overall tree growth is affected which
lowers the fruit yield.
• On the lower surface, the lesions are covered with masses of
fungal spores which appear as dark dots.
• The spores, leaf spots or black spot on the papaya leaves, are
spread in wind and wind-driven rains from tree to tree.

8. MODE OF SPREAD
MODE OF SPREAD
• The spores, black spots on the papaya leaves, are
spread in wind and wind-driven rains from tree to
tree.
• Disease spread by wind and rain disease emergence
favored by cool weather interespersed with moisture
favored by cool weather interespersed with moisture
from dew or rain.

9. DISEASE CYCLE
DISEASE CYCLE
CAUSAL ORGANISM
CAUSAL ORGANISM
Asperisporium
caricae
caricae

10. MANAGEMENT
MANAGEMENT
• There are papaya varieties that are resistant to
black spot, so control will be either cultural or
chemical or both.
• To manage black spot of papaya, remove any
infected leaves and fruit at the first sign of
infection. Burn infected foliage or fruit, if
infection. Burn infected foliage or fruit, if
possible, to help prevent the spread of the
disease.
• Protectant fungicides that contain copper,
mancozeb, or chlorothalonil can also be used to
manage papaya black spot. When using
fungicides, be sure to spray the undersides of
the leaves where the spores are produced.

11. REFERENCES
REFERENCES
https://www.quora.com/Why-does-a-papaya-spoil-the-outer-
skin-before-getting-ripe-inside
file:///C:/Users/HP/Downloads/PaDIL-
AsperisporiumBlackSpotofPapaya-Asperisporiumcaricae.pdf
https://www.researchgate.net/publication/305147684_Asperispor
ium_black_spot_of_papaya_Asperisporium_caricae
ium_black_spot_of_papaya_Asperisporium_caricae
https://www.gardeningknowhow.com/edible/fruits/papaya/bla
ck-spot-of-papaya-trees.htm
www.slideshare.in
www.vikashpedia.in
www.wikkipedia.in