Noakhali Science and Technology University

Study on the Symptoms of Plant

DiseasesCourse Title: Fundamentals of Plant Pathology -
Lab Course Code: AG 2102
Group no: 03

Submitted by, Submitted to,

Nishat Tasnim Dr. Mehede Hassan Rubel
ID:BKH2314014F Associate Professor,

Rohit Roy Dept. of Agriculture,

Noakhali Science and
MUH2314016M
Technology University.
Khan Md. Zulkar Nine Arnon
MUH2314017M
Sazzadur Rahman Shuvro
ASH2314018M
Saima Jashim
BFH2314019F
Serial No Disease Name Page No

1 Pumpkin Yellow mosaic Virus

2 Wilt of chilli

3 Powdery Mildew in Pumpkin

4 Gumosis of sojina/maringa

5 Leaf curl of Eggplant

6 Citrus canker

7 Rhizopus rot

8 Rice blast

9 Galls on Litchi tree

10 Cercospora leaf spot

11 Yellowing in Leaves

12 Anthracnose in Mango leaves

13 Anthracnose in Gourds

14 Potato Scab
 Fig: Leaf Curl in Tomato

Leaf curl is a plant disease, often caused by a fungus like

Taphrina deformans (which causes peach leaf curl) or a
virus, that leads to leaves curling, distorting, and
sometimes discoloring, ultimately impacting plant health
and fruit production.
Here's a more detailed breakdown:
Causes:
Fungal Diseases:
Peach Leaf Curl: A common fungal disease affecting
peaches, nectarines, and sometimes almonds, caused by
Taphrina deformans.
Other Fungal Leaf Curl: Other fungal diseases can also
cause leaf curl in various plants.
 Fig: Yellowing
Yellowing of leaves, or chlorosis, in plants is often a sign
of nutrient deficiencies, particularly in nutrients like
nitrogen, iron, magnesium, or potassium, which are
essential for chlorophyll production and
overall plant health.

Fig: Scab of Potato

Potato scab is a common soil-borne disease caused by
bacteria, primarily Streptomyces scabies, that causes
rough, corky lesions on potato tubers, reducing their
marketability and storage potential, though they are still
safe to eat after peeling.
Here's a more detailed explanation:
What is Potato Scab?
Cause:
Potato scab is a disease caused by bacteria, specifically
Streptomyces scabies and other related species, which
are naturally present in the soil.
Symptoms:
The disease manifests as rough, corky, or scabby lesions
on the surface of potato tubers.

Fig: Wilt of Chilli

Wilt disease symptoms typically include sudden
wilting and drooping of leaves and stems, often
accompanied by yellowing or browning of leaves,
and discoloration of the vascular system, which can
lead to stunted growth and premature death. It
may appear from early stages of plant growth (4-6
week old plant) upto flowering and podding.

Fig: Powdery Mildew in Pumpkin

Causal agent: The causal agents of powdery mildew
in pumpkins are the fungal pathogens Podosphaera
xanthii and Erysiphe cichoracearum. Podosphaera
xanthii is the more common of the two.
Symptoms: The characteristic symptom of the
disease is the white superficial powdery fungal
growth on leaves, stalks of panicles, flowers and
young fruits. The affected flowers and fruits drop
pre-maturely reducing the crop load considerably or
might even prevent the fruit set

Fig: Rice Blast

Leaf Symptoms -
Lesions that occur on the
leaf are usually diamond
shaped with a gray or
white center and brown
or reddish-brown border and are 0.4 to 0.6 inch
(10–15 mm) long and 0.12 to 0.2 inch (3–5 mm)
wide. Newly formed lesions may have a white or
gray-green center and a darker-green border. Leaf
Collar Symptoms - Infection at the junction of the
leaf blade and the sheath results in the typical
brown collar rot symptom. Severe collar infection
often results in the death of the leaf. Node
Symptoms - Stem nodes may be infected as the
plant approaches maturity, causing the complete
death of the entire stem above the infection.
Diseased nodes are brown or black. Panicle and
Grain Symptoms - Infections just below the panicle,
usually at the neck node, cause a neck rot or rotten
neck symptom that can be very injurious to the crop
and is typically referred to as neck blast.
Fig: Mosaic in Beans
Symptoms
Close up symptoms include a mosaic (alternating
light and dark green areas) on some leaves,
especially the younger ones. Leaves may also be
curled. Fruit may be distorted and develop mosaic
symptoms. Internally, brown areas and necrotic
areas develop and the fruit do not ripen normally.

Fig: Citrus
Canker

Symptoms: Canker- dead area in bark or cortex

formation of sharply delineated, dry, necrotic, localized
lesions on the stem due to death of cambium tissue of
bark, or (in non-woody plants) .
 Fig: Leaf Spot in Gourd
Symptoms
Leaf spots first appear on the older leaves in the
middle and upper part of the plant. The spots start
as small, necrotic flecks. They enlarge and contain
concentric rings and are surrounded by a yellow
halo. Other parts of the plant are not directly
affected. An indirect effect is seen the fruit
production. Alternaria leaf spot may cause reduced
yield and smaller fruit.
 Fig: Leaf Blight
Symptoms
Spots begin as small, dark, dry, papery flecks, which
grow to become brown black, circular-to-oval areas.
 Fig: Mango anthracnose
Symptoms
On mango, anthracnose symptoms occur on leaves,
twigs, petioles, flower clusters (panicles), and fruits.
On leaves, lesions start as small, angular, brown to
blackspots that can enlarge to form extensive dead
areas. The lesions may drop out of leaves during dry
weather. The first symptoms on panicles are small
black or dark-brown spots, which can enlarge,
coalesce, and kill the flowers before fruits are
produced, greatly reducing yield. Petioles, twigs,
and stems are also susceptible and develop the
typical black, expanding lesions found on fruits,
leaves and flowers.

Fig: Red Rust in Guava

Symptoms Conspicuous orange to reddish pustules
of the causal fungus are produced on foliage, young
shoots, flowers, and fruit.

Fig : Shot Hole

Shot Hole Disease Description:
Shot hole is a leaf disease that produces brown spots on
plant foliage that eventually dry out, fall, and leave
multiple holes in the leaf.

Hosts:
Prunus spp. such as plum, cherries, and laurels.

Biology & Symptoms:

Wet and humid weather, particularly in spring,
contributes to the spread of shot hole disease.
 Fig: Banana bunchy top disease

Symptoms
Short, pointing upright, and chocking top leaves
with dark green flecks along the leaf midrib.
Infected plants rarely produce a bunch.