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Kindly send me the yesterday Thursday practical class absentees list also
mail id : potatojaiganesh@gmail.com
Thursday, 24 October 2019
Wednesday, 9 October 2019
Ex. No.17 Study of Physiogenic diseases
Physiogenic / Physiological disorders /
non parasitic diseases / Abiotic diseases / Nutritional disorders The plants are producing
symptoms due to macro micro nutrient deficiencies and environmental characters.
Such diseases are called as Non parasitic diseases.
|
Disease name
|
Causal agent / deficiency
|
Symptoms
|
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|
Khaira or
Khera disease of rice (Y.L.Nene)
|
Zn
|
Affected leaf area become papery, necrotic and
entire mass of leaves become collapses
|
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|
Red leaf of cotton, Chlorosis in rice
|
N
|
|
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|
Marginal drying of Banana
|
K
|
|
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|
Citrus
Mottling or Foliocellosis
|
Zn
deficiency
|
Green chlorotic mottling
|
|||
|
Blossom end
rot of tomato
|
Calcium
& High Temp.
|
Marginal Chlorosis
|
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|
Wither tip of flax
|
Ca
|
|
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|
Wither tip of apple, Citrus Exanthema
|
Cu
|
|
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|
Whiptail of
cauliflower
|
Molybdenum
|
|
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|
Black tip
of mango
|
near brick
kilns
|
---
|
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|
Black heart
of potato
|
Unfavourable
oxygen conditions
|
----
|
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|
Green netting of citrus
|
Iron
|
|
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|
Sand drown of tobacco
|
Mg
|
|
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|
Brown heart of Turnip , Top sickness of tobacco
|
Boron
|
|
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|
Little leaf of apple
|
Zn
|
|
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|
Pahala blight of sugar cane
|
Mn
|
|
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My dear students
Total number of exercises are 17
Monday, 7 October 2019
Ex. No. 16 Study of
Angiospermic pathogens
Phanerogamic parasites / Flowering plant
parasites Very
few plants are parasitic on other plants (like weeds). They depend upon another
vascular plant for food and water. All the flowering parasites are absorbs
nutrients through haustoria. The
flowering parasites are divided into two based on the part of the plant
infection. Among the parasites, Orobanche is a monocot which infects dicot.
Remaining all are dicot plants. (High osmotic pressure, Produced Pectinolytic
& Cellulolytic enzymes)
Stem parasite
Complete / Total/
Holo stem parasite – Cuscuta sp.
Partial/ Semi
/Hemi stem parasite – Loranthus
Root parasite
Complete / Total/
Holo root parasite – Orobanche sp.
Partial/ Semi
/Hemi root parasite – Striga sp.
|
Flowering
parasites
|
Other names
|
Infected
crops
|
Parasite Characters
|
Family
|
Stimulating
compound, characters
|
|
Cuscuta sp. – Total stem parasite
Cuscuta campestris
|
Dodder,
Gold thread, Love vein, strangle weed, Amarbel
|
Ornamental
plants, Chilli, potato, Alfalfa, fruit trees
|
Thread
like leafless greenish white stems and flowers are white in colour
|
Convolvulaceae
|
Zoochory,
Hydrochory
|
|
Loranthus
– Partial stem parasite
Dendrophthoe
|
Giant
mistletoe / Banda
|
Fruit
trees
|
The
hold fast may become as large as a tennis ball, the leaves are thickening in
nature.
|
Loranthaceae
|
Transmitted
through Birds excreta (desiccated seeds)
|
|
Orobanche - Total
root parasite, Trap crop – Flax/ Linseed
|
Broom
rape, Tokra
|
Tobacco,
Sunflower
|
Annual
fleshy flowering plant, pale in colour, scaly leaves without chlorophyll. The
seeds size are very minute.
|
Orobanchaceae
|
Benzopyran
derivatives; Snap[ dragon like flowers & Shallow cup like
appressoria
|
|
Striga sp.- Partial root parasite , Trap crop – Cotton,
Peanut
|
Witch
weed
|
Dry
land sorghum, Maize, Sugar cane
|
Opposite
leaves and irregular flowers with a pronounced bend in the corolla tube. They
are lack of root hairs and root cap.
|
Scorphulariaceae
|
Strigol;
Bulb shaped Haustorium
|
Among
the flowering parasites, Rafflesia arnoldii on Vitis roots
is said to produce largest flower in the world.
Sandalwood
is a semi root parasite & Cassytha is a stem parasite affects
Citrus, Orange and Apple trees
Ex.
No. 15. Study
of Viral, Phytoplasmal & Viroid diseases
Virus: Virus is a transmissible, sub
cellular entity which replicates only in the living cell (biotroph) and consist
of nucleic acid which is typically surrounded by a protein coat. Ex. Tobacco Mosaic Virus
Dwarfism or
Stunted growth is a common symptom produced by a virus.
Vector:
Insects which
transmit viruses are called as vectors
|
Disease name
|
Causal Organism
|
Symptoms
|
Vector
|
|
Tobacco Mosaic
|
Tobacco Mosaic
virus
(TMV)
|
Stunted growth,
Alternate green and yellow patches are appear
|
Sap transmission
|
|
Bhendi yellow
vein mosaic or Bhendi Yellow vein clearing
|
Bhendi Yellow
Vein Mosaic Virus (BYVMV)
|
Veinal
Chlorosis
|
White fly
– Bemisia tabaci
|
|
Tomato Spotted
Wilt
|
Tomato Spotted
Wilt Virus (TSWV)
|
Bronzing of
veins, Leaves are reduced in size. Concentric rings and Mosaic mottling on
fruits.
|
Thrips – Scirtothrips dorsalis
|
|
Chilli leaf
curl
|
Tobacco Leaf
Curl Virus (TLCV)
|
Curling of
leaves like a boat or spoon structures
|
White fly - Bemisia
tabaci
|
|
Chilli mosaic
|
Chilli mosaic
virus
|
Stunted
growth, Alternate green and yellow patches are appear. Mottling and Puckering
of leaves
|
Aphids – Aphis
gossypii
|
|
Banana Bunchy
top
|
Banana Bunchy
Top Virus (BBTV)
|
Bunchy
appearance of leaves. Leaves are reduced in size and become chlorotic. They
are brittle and the infected plants do not grow more than 3 feet.
|
Black aphid
– Pentalonia nigronervosa
|
|
Black gram
leaf crinkle
|
Urdbean Leaf
Crinkle Virus (ULCV)
|
Crinkling and
Curling of leaves.
|
White fly
– Bemisia tabaci
& Aphid
|
|
Cassava
Mosaic
|
Indian Cassava
Mosaic Virus (ICMV)
|
Stunted
growth, Alternate green and yellow patches are appear. Tuber splitting
symptoms are appear.
|
White fly
– Bemisia tabaci
|
|
Rice
Tungro
|
Rice Tungro
Virus (RTBV – Rice Tungro Bacilliform Virus & RTSV– Rice Tungro
Spherical form Virus)
|
Orange yellow
colour discolouration from the tips of lower leaves (Tungro – Degenerated
growth)
|
Green Leaf
Hopper – Nephotettix virescens
|
|
Pulses
Mosaic
|
Cowpea Aphid
Borne Mosaic Virus
|
Stunted
growth, Alternate green and yellow patches are appear.
|
Aphid - Aphis
gossypii
|
Phytoplasma : Mycoplasma
Like Organisms (MLO) which are infect the plants called as phytoplasma. They
are lack of cell wall, gram negative and sensitive to Tetracycline (Mollicutes
group).
|
Disease name
|
Causal Organism
|
Symptoms
|
Vector
|
|
Little leaf of
Brinjal
|
Candidatus Phytoplasma
|
Small, narrow
pale green colour leaves. Shortening of internodes with bushy appearance
|
Leaf hopper – Hishimonas
phycitis
|
|
Sesame
phyllody / Green flowering
|
Candidatus Phytoplasma
|
The flowers
are transformed into green leaf like structure
|
Leaf hopper
– Orosius albicinctus
|
Viroid: Nucleic acid without
protein coat. Viroids are transmitted through mechanical transmission.
Ex.
Potato Spindle Tuber Viroid (PSTVd)
Smallest
Viroid : Coconut Cadang Cadang Viroid
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