Physiological disorders of warm season vegetables
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Transcript of Physiological disorders of warm season vegetables
Physiological disorders of warm season vegetables
Ningappa kirasur2014-12-129Dept. of OlericultureCOH, Vellanikkara
Tomato Blossom end rot
Blotchy ripening
Cat face
Puffiness
Sunscald
Cracking
Gold fleck
Symptoms
• Common and destructive disorder
• Lesion appear at blossom end of fruit while it is green
• Water-soaked spots appear at the point of attachment of
the senescent petals
• Affected portion becomes sunken, leathery and dark
colored
Management
• Balanced irrigation and staking
• Foliar spray of calcium chloride 0.5%
• At fruit development stage
Blotchy ripening
Symptoms:• Irregular ripening, green
blotches over red skin
Causes:
• Severe water stress, poor
potassium uptake and
distribution in plants
Management
• Regulated water supply during fruit development
• Foliar sprays of 0.5% potassium chloride
Cat face
Symptoms:
• The fruit gets distorted at the blossom end
• The fruits have ridges, furrows, indentations and
blotches
• The cells at blossom end of the ovary die and turn black
and forms leathery blotchCauses:• Unfavorable climatic condition during flowering causes
distortion of growth of the pistil cells
Contd…
Cat face
Management
• Grow varieties free from this distortion
• Grow tomatoes in the ample growing conditions
Puffiness
Causes:
o Low or high temperature
o Lack of pollination and fertilization
Symptoms:
• The outer wall continues to develop normally
• But the growth of internal tissues is retarded
Management
• Maintaining optimum soil moisture
• Avoid over irrigation
Sun scald
Symptoms:
• Green or near green of fruits exposed to sun light
• The tissues have blistered, water soaked
appearance
• Rapid desiccation leads sunken area on ripe fruits
Management:
• To grow cultivars with heavy foliage provide
protection to fruits
Fruit cracking
Symptoms:o Radial cracking is more severe than
concentric crackingo Cracking start from stem end in ripe
fruitso Concentric crack around the shoulders
of green fruitCauses: Rain after a long dry spell
Management
Maintain optimum soil moisture
Grow resistant cultivars
Ex:-pusa ruby, Sioux, Roma, Arka saurabh
Spray borax at 0.3 - 0.4%
Gold flake
Causes:
Higher supply of calcium and phosphate
fertilizers
Excess calcium oxalates
Symptoms:
Tiny yellow spots appear on the fruits
surface around the calyx and fruit shoulder
Management Apply recommended dose of calcium and potassic
fertilizers
Provide shade during summer season
Brinjal
Poor fruit sett
Causes:
Due to presence of large number of pseudo short
styled and short styled flowers
Dropping of long and medium styled flowers
Management:
Spraying of 2,4-D (2 ppm) and NAA (60 ppm) at full
bloom stage
Chili and Sweet Pepper
Blossom end rot
Symptoms:
Water soaked spots appear on blossom end
of the fruits
The spots become light brown, papery and
finally lesions dry out
Causes:
Heavy application of nitrogenous fertilizer
Heavy irrigation after a dry spell
Management
Heavy dose of nitrogenous fertilizer should be
avoided
Irrigate the crop properly
Maintain optimum moisture in soil
Chilling injury
Causes:
Expose of fruits to low temperature
Symptoms:
Surface pitting, premature loss of firmness
Fruits fail to ripen and poor color development
Management :
Maintains the optimum growing conditions
Beans
Transverse cotyledon cracking
Symptoms:
Major disorder in French bean
Due to planting dry seeds in wet soil
White seeded cultivars are more prone
Seeds with 12% moisture has better germination
Tapioca
Vascular streaking
Causes:
Complex biochemical change and wounding
increased respiration rate and ethylene production
Symptoms:
Blue black discolorations on the ring of vascular tissues
Disorder takes the form of streaks-” Blue Vein”
Management:
Pruning of aerial parts at 2 weeks before harvest
Thank you