Physiological disorders in cauliflower:
1. Buttoning :
This disorder is characterized by development of small curd. Buttoning
may be due to overaged seedlings, poor nitrogen supply, planting wrong
cultivar, i.e., early cultivar planted late and also due to root injury by insects or
by some disease. Generally, if there is any check in the vegetative growth of
the seedlings, buttoning may be induced.
2. Riceyness :
Premature initiation of floral buds is characterized by riceyness in
cauliflower and is considered to be of poor quality for marketing. Such
disorder may result from any temperature higher or lower than the optimum
required for a particular cultivar.
3. Browning :
This is caused by boron deficiency. It appears as a small water
soaked areas in the centre of the curd. Later, the stem becomes hollow with
soaked tissue surrounding the walls of the cavity. In more advanced stage,
pinkish or rusty brown areas develop on the surface of the curd and hence, it
is also known as brown rot or red rot. Affected curd develops a bitter taste. It
can be controlled by application of borax or sodium borate @ 20 kg/ha. In
case of acute deficiency, spray of 0.25 to 0.50% solution of borax @ 1 to 2
kg/ha is advocated.
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4. Whiptail :
This results due to deficiency of molybdenum. The leaf blades do
not develop properly and become strap-like. The growing point is severly
deformed and no marketable head is formed. It occurs in acidic soil below
pH 4.5. Whiptail can be prevented by brining the soil pH to 6.5 by liming with
49
5-7.5 t/ha of limestone or by applying 2.5-5 kg/ha of sodium or ammonium
molybdate. Foliar spray with 0.05% sodium molybdate solution is also
recommended.
5. Blindness:
It is supposed to be due to low temperature when the plants are small or
due to damage to the terminal bud during handling of the plant or due to
insect pest like cut worms which eat the terminal bud
1. Buttoning :
This disorder is characterized by development of small curd. Buttoning
may be due to overaged seedlings, poor nitrogen supply, planting wrong
cultivar, i.e., early cultivar planted late and also due to root injury by insects or
by some disease. Generally, if there is any check in the vegetative growth of
the seedlings, buttoning may be induced.
2. Riceyness :
Premature initiation of floral buds is characterized by riceyness in
cauliflower and is considered to be of poor quality for marketing. Such
disorder may result from any temperature higher or lower than the optimum
required for a particular cultivar.
3. Browning :
This is caused by boron deficiency. It appears as a small water
soaked areas in the centre of the curd. Later, the stem becomes hollow with
soaked tissue surrounding the walls of the cavity. In more advanced stage,
pinkish or rusty brown areas develop on the surface of the curd and hence, it
is also known as brown rot or red rot. Affected curd develops a bitter taste. It
can be controlled by application of borax or sodium borate @ 20 kg/ha. In
case of acute deficiency, spray of 0.25 to 0.50% solution of borax @ 1 to 2
kg/ha is advocated.
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4. Whiptail :
This results due to deficiency of molybdenum. The leaf blades do
not develop properly and become strap-like. The growing point is severly
deformed and no marketable head is formed. It occurs in acidic soil below
pH 4.5. Whiptail can be prevented by brining the soil pH to 6.5 by liming with
49
5-7.5 t/ha of limestone or by applying 2.5-5 kg/ha of sodium or ammonium
molybdate. Foliar spray with 0.05% sodium molybdate solution is also
recommended.
5. Blindness:
It is supposed to be due to low temperature when the plants are small or
due to damage to the terminal bud during handling of the plant or due to
insect pest like cut worms which eat the terminal bud
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