post harvest disease symptoms
TRANSCRIPT
Post harvest diseases destroy 10-30 per cent of the
total crop yield
In some perishable crops ›30 per cent
Post harvest diseases develop on plant produce
during harvesting, grading and packing
During transportation to market/ consumer
While in possession of the consumer until the actual
consumption
ASPERGILLUS, PENICILLIUM, ERWINIA, MONILINIA,
ZYGOMYCETES, AND SCLEROTINIA DISEASES
Aspergillus ear rot of corn, caused by Aspergillus
flavus
Infection under storage condition
Storage fungi emerging from embryos of wheat seed
incubated in a moist atmosphere.
(Aspergillus spp. & Penicillium spp.)
Concealed damage (yellow moldand aflatoxin) in peanut seeds
split in half to reveal sporulating Aspergillus flavus.
Sporulation of Aspergillus
flavus
on a peanut kernel
Blue mold on citrus, with heavy
sporulation of Penicillium italicum.
Several stages of green mold on sweet
oranges. (Penicillium digitatum)
Decay of garlic cloves, caused by Penicillium hirsutum
ERWINIA SPP.
Stem rot of Aloë vera, caused by Erwinia chrysanthemi,
resulting in a complete loss of the plant
Soft rot of crisphead lettuce, caused by
Erwinia carotovora subsp. carotovora.
Soft rot on lettuce crown, caused by
Erwinia carotovora pv. carotovora
Bacterial soft rot of tomato, caused by Erwinia spp.
Purple stain of papaya caused by Erwinia herbicola
showing bright purple speckling that fades to a greenish yellow
a few hours after fruits are cut open
1. Rhizopus rot of grape,
caused by Rhizopus
arrhizus
2. Rhizopus soft rot of papaya
caused by Rhizopus stolonifer.
3. Choanephora fruit rot of summer squash, caused by
Choanephora cucurbitarum.
Sclerotinia sclerotiorum
sclerotia
on bean pods and stem
Germinating sclerotium and
apothecia of Sclerotinia
sclerotiorum on bean
Sclerotinia rot on pea pods showing
mycelial mat is about to become a
large, black sclerotium. (S.
sclerotiorum)
Pea seed contaminated with
sclerotia S. sclerotiorum.
Sclerotia of S. sclerotiorum inside a soybean
stem
Sclerotinia rot of melon, caused by S. Sclerotiorum; Sclerotinia stem rot of tomato
Sclerotia of S. Sclerotiorum in tomato stem