Papaya

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 :-BSemester :-5
th
Programme :-B.Sc.(Hons.)Agriculture

3. INTRODUCTIONINTRODUCTION
LEAF SPOT OR BLACK SPOT OF PAPAYALEAF SPOT OR BLACK SPOT OF PAPAYALEAF SPOT OR BLACK SPOT OF PAPAYALEAF SPOT OR BLACK SPOT OF PAPAYA
CAUSAL ORGANISMCAUSAL ORGANISM
SYMPTOMS SYMPTOMS
MODE OF SPREAD MODE OF SPREAD
DISEASE CYCLEDISEASE CYCLE
MANAGEMENTMANAGEMENT

5. LEAF SPOT OR BLACK SPOT OF LEAF SPOT OR BLACK SPOT OF
PAPAYAPAPAYA
•Asperisporiumcaricae is
anascomycetsfungusthatisaplant
pathogenfoundinnorthandsouth
america.itisresponsiblefortheleaf
spotorblackspotdiseaseonspotorblackspotdiseaseon
papayatrees.itaffectsgenerallyleaves
atanytime. Sporodochia
ofAsperisporiumcaricaewasgrowing
undersideofleaf,darkblackishbrown
toblack,stromawell-
developed,erumpent.
Asperisporiumcaricae

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

7. SYMPTOMSSYMPTOMS
•Theinitialsymptomsarewater-soakedspotsontheupperleaf
surface.
•Later,small,black,brownoryellowspotsarevisibleonthe
undersideoftheleaf.
•Asthediseaseprogresses,smallblackspots(spores)canbeseen
ontheundersideofleaves.ontheundersideofleaves.
•Ontheuppersurface,thelesionsareroundedorsomewhat
angular,1-4mmindiameter,paleyellow,withdarkmargins.
•Ifleavesareseverelyinfected,theyturnbrownanddie.When
leavesdieoffextensively,overalltreegrowthisaffectedwhich
lowersthefruityield.
•Onthelowersurface,thelesionsarecoveredwithmassesof
fungalsporeswhichappearasdarkdots.
•Thespores,leafspotsorblackspotonthepapayaleaves,are
spreadinwindandwind-drivenrainsfromtreetotree.

8. MODE OF SPREADMODE OF SPREAD
•Thespores,blackspotsonthepapayaleaves,are
spreadinwindandwind-drivenrainsfromtreeto
tree.
•Diseasespreadbywindandraindiseaseemergence
favoredbycoolweatherinterespersedwithmoisturefavoredbycoolweatherinterespersedwithmoisture
fromdeworrain.

9. DISEASE CYCLEDISEASE CYCLE
CAUSAL ORGANISMCAUSAL ORGANISM
Asperisporium
caricaecaricae

10. MANAGEMENTMANAGEMENT
•Therearepapayavarietiesthatareresistantto
blackspot,socontrolwillbeeitherculturalor
chemicalorboth.
•Tomanageblackspotofpapaya,removeany
infectedleavesandfruitatthefirstsignof
infection.Burninfectedfoliageorfruit,ifinfection.Burninfectedfoliageorfruit,if
possible,tohelppreventthespreadofthe
disease.
•Protectantfungicidesthatcontaincopper,
mancozeb,orchlorothalonilcanalsobeusedto
managepapayablackspot.Whenusing
fungicides,besuretospraytheundersidesof
theleaveswherethesporesareproduced.

11. REFERENCESREFERENCES
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_caricaeium_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