What is Disease?
Disease issomething that causes disturbance in plant so plant cannot
make reproduction or dies slowly.
Characteristicof disease are asfollows :
1. The cause of disease ishardly seen by naked eye
2. The cause of disease are microorganism ( virus, bacteria, fungi, or
mushroom ) and lackof certain substance in the soil
3. Disease attackcommonly is in indirect so the plant dies slowly
Viruses are very smallorganisms whose composition is very simple
because it only contains the acid nucleiin the form of RNA and only a
few DNA. Properties virus isdifferent from other organisms can be
crystallized without the loss of infection.
A bacterial single-celledprokaryotic microorganisms. There are
about 200 species of bacteria thatcan cause plant diseases. This
especially type of rod-shaped bacterium include Agrobacterium,
Corynebacterium, Erwinia,Pseudomonas, and Xanthomonas
Fungi reproduce by spores that spread expenditure through the
medium of air, water, and soil. Fungus likesdamp areas and can live to
stay another organism. Most of fungi is the enemy of the plant because
of the many plants thatdied due to fungi attack.
1. BLIGHT DISEASE OF POTATO LEAF
The first symptoms are the presence of pock on the edges and tip of
the leaf, the pock widens and form a brown necrotic areas. pocks
surrounded by white sporangium. The development of leaf pock disease
is most rapidly occurring at a temperature of 18 ˚ C - 20˚ C. On the air
temperature 30˚ C the development of spots hampered.
Thisdisease is caused by Phytophthora infestans fungus.
The control to the disease isby :
1. Cultivating potato that endures to disease
2.Using healthy potato pest
3.Makingspraying by using fungicide
BLIGHT DISEASE OF POTATO LEAFPhytophthora infestans
2. CABBAGE WET ROTTEN DISEASE
Shows symptoms those are on its leaf found wet pock of irregular shape.
The pock widens and folding, it has blackish brown colour. Secondary bacteria
2. Keeping humidity of not too high by cultivation cabbage plant with
3. Always Wash the product by water that contains chlorine or borax of
3. DISEASE IN CABBAGE POUNDER ROOT
Shows symptoms those areits root gets fission reaction and cell
enlargement. Then formed lumpor irregular gland, the lump unite to be
enlengthen swollen likepounder. The leaf becomes grey green and faster
withered because its transporter tissue is broken.
Thisdisease caused by Plasmodiophora brassicaefungus.
To control this diseaseby :
1.Preventing the entering of fungus of disease to the lands that free
from fungi infect
2.Seeding in land of pathogenic free
4. CHILI WITHERED DISEASE
Show symptoms those areyoung leaf is withered followed by
yellowing of oldleaves. If the tip of stem is cut and pressed, from
surrounding of vascularbundles willquit mucilage of grayish color
This disease caused byPseudomonas solonacearumbacteria.
To control this disease by :
1.Decreasing bacteria population in soil by covering soil with
transparent plasticfor one month
2.Making plant rotation
4.Chemically by using bactericide also soil sterilization
5. VIOLET SPOTS DISEASE IN GARLIC
Shows symptoms those are inits leaf appears small spots, folding of
white colored untilgrey. If its size enlarges, spots are seen “ringed” and
its color rather purplish and surrounded by yellow color.
This disease caused by Altenariaporri fungus.
To control the disease is done by:
1.Cultivating garlic in land that has good water conduct
2.Making plant rotation
VIOLET SPOTS DISEASE IN GARLICAltenaria porri
6. LEAF ROTTEN DISEASE OF ONION
Shows symptoms those arenear its leaf appears pale green spots. If
condition of surrounding is humid, on the leaf develops violet white
colored fungus and leafbecomes turn yellow, withered, and dried.
This disease caused byPeronospora destructor fungus.
To control by :
1.Using healthy seed or free from disease
2.Burning leaf of harvest remain
LEAF ROTTEN DISEASE OF ONIONPeronospora destructor
7. LEAF SPOTS DISEASE IN ASPARAGUS BRANCH
Shows symptoms those are there arefound enlengthen spot of brown
until grey colored with wide edge of reddish brown in its leaf and branch.
This disease caused by :Cercospora asparagifungus.
To control this disease by spraying contact fungicide.
LEAF SPOTS DISEASE IN ASPARAGUS
8. Soft rot disease
Soft rot isa rotting that disease happen at the neck newly grown plant
roots ( during germination ).
This disease iscaused by an infection of the fungi Phythium sp.or
Rhizoctonia solani.The neck of the root will become smaller so the root
can no longer support the stem. As a result, the new plant will collapse.
9. POWDERY MILDEW DISEASE
Thisdisease attacksa growing seed, so the seed becomes spongy and
finallydies. The cause isthe fungi Peronospora parasitica.This fungus
sometimes also attacksseeds that already have their first leaves. The
plant becomes short with blackspots on the leaves, which lead to
10. CVPD DISEASE
The Citrus Vein Phloem Degeneration( CVPD ) disease is adisease that
attacksthe phloem of an orange’s stem. The symptoms are that the leaf
buds become small, and turn yellow so they become yellow colored
fruit. This disease is caused by bacteria.
Thisdisease attacksthe internodes of the stem and grains. It iscaused
by the fungus Pyriculariaoryzae. Thus, the internodes of the stem are
easily broken and crops finallydie.
Tobacco Mosaic Virus ( TMV ) virus causes white spots on tobacco’
leaves which lead to decrease in the quality of the leaves
12. Tobacco mosaic disease
11. Disease in rice plants
Pyricularia oryzae Disease in rice plants
No. The name of
The name of
the parts that is
1. BLIGHT DISEASE OF
The leaf 1. Cultivating potato that
endures to disease
2. Using healthy potato
3. Making spraying by using
2. CABBAGE WET
The root 1. Keeping cleanliness of
garden from remain of
2. Keeping humidity of not
too high by cultivation
cabbage plant with
cultivating distance not
3. Always Wash the
product by water that
contains chlorine or
borax of 7.5%
4. Stored in warehouse that
has enough of ventilation
3. DISEASE IN CABBAGE
The root 1. Preventing the entering
of fungus of disease to
the lands that free from
2. Seeding in land of
4. CHILI WITHERED
The leaf 1. Decreasing bacteria
population in soil by
covering soil with
transparent plastic for one
2. Making plant rotation
3. Regulating irrigation
4. Chemically by using
bactericide also soil
5. VIOLET SPOTS DISEASE
Altenaria porri The leaf 1. Cultivating garlic in land that
has good water conduct
2. Making plant rotation
3. Making fungicide spraying
6. LEAF ROTTEN DISEASE
The leaf 1. Using healthy seed or free
2. Burning leaf of harvest
3. Spraying fungicide
7. LEAF SPOTS DISEASE IN
Cercospora asparagi The branches spraying contact fungicide.
8. Soft rot disease Phythium sp. or
9. POWDERY MILDEW
10. CVPD DISEASE bacteria phloem
11. Disease in rice plants Pyricularia oryzae the stem and grains
12. Tobacco mosaic disease virus The leaf
1. A plant disease that attacks leaves is ……
a. Powdery mildew disease
b. Soft rot disease
c. Tobacco mosaic disease
d. CVPD disease
2. Blight disease of potato leaf is caused by fungi ……
a. Phytophthora infestans
b. Peronospora parasitica
c. Rhizoctonia solani
d. Pyriculuria oryzae
3. Shows symptoms of disease in cabbage pounder root is
a. The young leaf is withered followed by yellowing
of old leaves
b. Near its leaf appears pale green spots
c. Root gets fision reaction and cell enlargement
d. In its leaf appears small spots
4. To control disease leaf spots disease in asparagus branch
a. Making plant rotation
b. Burning leaf of harvest remain
c. Chemically by using bactericide also soil
d. Spraying contact fungicide
5. Soft root is …..
a. Seed becomes spongy and finally dies
b. A rotting that disease happens at the neck
newly grown plant roots (during germination)
c. Citrus vein phloem degeneration
d. Tobacco mosaic virus