🍐Papaya

• Botanical Name: Carica papaya
• Family: Caricaceae
• Origin: Tropical America
• Papaya was introduced in India in 16^th century. It was brought to India by the Portuguese and has since become one of the most commonly grown tropical fruits across the country.
• It is a tropical fruit and more sensitive to frost.
• Carica candamarcensis — Mountain papaya.
• Highest productivity after Banana. Papaya yields more fruit per hectare than almost any other fruit crop except banana, making it highly profitable for small-scale farmers.
• India has 4^th rank in papaya production in the world.
• Highest producing state in India - Andhra Pradesh

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• Frost is the most limiting factor in papaya cultivation in north India. Even a mild frost can kill papaya plants, which is why commercial papaya cultivation in North India is restricted to frost-free pockets or requires frost protection measures.
• Papaya is thermosensitive crop. Sex expression in papaya is strongly influenced by temperature — high temperatures tend to produce more male flowers, while moderate temperatures favour hermaphrodite (bisexual) flowers that are commercially desirable.
• Papaya plants are very susceptible to water logging. Even brief periods of waterlogging cause root rot and plant death. Well-drained soils and raised bed planting are essential for successful papaya cultivation.

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• Yellow pigment in papaya — Caricaxanthin. This carotenoid pigment gives the flesh its characteristic yellow to orange colour and acts as an antioxidant beneficial for human health.
• Carpine obtained from papaya, is utilized as a diuretic and heart stimulent. Carpaine is an alkaloid found in papaya leaves and has been used in traditional medicine for treating cardiac and kidney disorders.
• Pepsin - Dried latex of Papaya contains this enzyme.
• Papain - Enzyme present in papaya for marinating meat and meat products. Papain is a powerful proteolytic enzyme (protein-digesting) found in the latex of unripe papaya. It breaks down tough meat fibres, making it an excellent natural meat tenderizer widely used in the food industry.
• Papain contain 72.2% protein.

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• Papaya is highly cross-pollinated plant. Wind and insects (primarily moths) are the main agents of pollination in papaya.
• Papaya is commercially propagated by seed. Since papaya is a short-lived perennial (productive for only 3-4 years), raising new plants from seed every few years is economically practical.
• Papaya is Polygamous plant i.e. Bearing some flowers with stamens only, some with pistils only, and some with both, on the same or different plants. This means papaya trees can be male, female, or hermaphrodite (bisexual). Hermaphrodite plants are commercially preferred because they are self-pollinating and produce uniform, elongated fruits.

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• Seed Rate for Gynodioecious (Gynodioecy is the evolutionary intermediate stage between hermaphroditism (exhibiting both female and male parts) and dioecy (having two distinct morphs: male and female variety) - 250-300 gm/ha. Gynodioecious varieties produce a population of both female and hermaphrodite plants, so fewer seeds are needed since all plants can bear fruit.
• Seed Rate for Dioecous (Plant in which male and female reproductive parts occur in different plants) - 400-500gm/ha. Higher seed rates are needed for dioecious varieties because the male plants (which produce no fruit) must be thinned out after sex identification, wasting planted material.
• 1 gram = 20 seeds of papaya.
• Seed are enclosed in gelatinous sarcotesta. The sarcotesta is a mucilaginous outer layer of the seed coat that must be removed before sowing to improve germination percentage and speed.

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• Recommended spacing for Pusa Nanha is 1.25 X 1.25 m² (6000 plants/hac). Pusa Nanha is an extremely dwarf variety, so very close spacing is possible, achieving ultra-high density planting and maximum yield per unit area.
• Damping off is most serious disease of papaya seedlings. Caused by soil-borne fungi (Pythium, Rhizoctonia), damping off kills seedlings before or after emergence, making nursery management critical for successful papaya production.
• 10% male plant is planted where dioecious varieties are cultivated. These male plants are retained solely to provide pollen for the female plants. Excess males are removed once sex identification is possible (usually at flowering).
• Sunrise solo type of papaya produce no male plants. Being gynodioecious, Sunrise Solo produces only female and hermaphrodite plants, eliminating the problem of non-productive male plants.
• Irrigation by ring method. In the ring method, a shallow basin is made around each plant for irrigation, ensuring water reaches the root zone without wetting the stem base, which helps prevent collar rot.

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Varieties

• Gynodioecous [DMCTSS]
  • Pusa Delicious
  • Pusa Majesty: One of highest papain yielders. This variety is specifically selected for papain extraction due to its high latex yield.
  • Coorg honey dew: Selection from honey dew (Madhu Bindu) - Hermaphrodite
  • Taiwan — (Blood red flesh). The deep red flesh colour indicates very high lycopene content, which is a powerful antioxidant.
  • Sunrise solo — (Pink flesh)
  • Surya

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• Dioecious Varieties
  • Pusa Nanha: Extremely dwarf, suitable for HDP (pot garden). Its compact size allows it to be grown even in kitchen gardens and pots, making it a unique variety for urban horticulture.
  • Pusa Giant: Suitable for tooty fruity and candies used in canning industry and have good wine resistance. The large fruit size and firm flesh of Pusa Giant make it ideal for processing into various preserved products.
  • Pusa Dwarf
  • Hatras gold
  • Betty
  • Pant C-1
  • CO-1: Dwarf
  • CO-2
  • CO-5: Cultivated mainly for papain extraction (Pupain yield 1500 — 1600 kg/ha). CO-5 is the most productive variety for commercial papain production, yielding significantly more latex than other varieties.
  • CO-6: Selection from Pusa Majesty
  • Pink flesh sweet: TSS — 12-14° Brix
  • Sunny bank
  • Improved Peresons

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• Hybrid
  • CO-3: CO-2 x Sunrise Gold
  • CO-4: CO-2 x Washinghton
  • CO-7: Pusa delicious x Coorg honey dew. Hybrid varieties combine the superior quality traits of both parents, offering improved yield, disease tolerance, and fruit quality.

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Disease

• Stem rot / Foot rot / damping off
  • Pythium aphanidermatum
  • It is most serious disease of papaya seedlings. This oomycete pathogen thrives in waterlogged, poorly drained nursery beds and can destroy an entire seedling crop within days.

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• Papaya Leaf curl

- Papaya leaf curl virus - Spread by `whitefly` Bemisia tabaci. The **whitefly** transmits the virus while feeding on plant sap, and once infected, the leaves **curl severely**, growth is stunted, and fruit production drops dramatically.

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• Papaya ring spot

- Papaya ring spot virus - Upper leaves of papaya is mottled. The virus causes **mosaic mottling** on leaves and characteristic **ring-shaped spots** on fruits, rendering them unmarketable. - Transmitted by `aphid` (Aphis gossipi).

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• Management:
  • Both white flies and aphids can be managed by spraying of any systemic insecticides i.e. Acephate @ 1.0 mllliter of water or Dimethoate 30 EC @ 1 ml/liter of water or
  • Imidacloprid @ 0.5 ml/liter of water with Streptocyclin a 0.1 g /liter of water is also effective. Systemic insecticides are absorbed by the plant and kill the insect vectors when they feed, providing longer-lasting protection than contact insecticides. Managing the vectors (whiteflies and aphids) is the primary strategy for controlling these viral diseases, since there is no direct cure for plant viruses.

Summary Cheat Sheet

Concept / Topic	Key Details
Papaya botanical name	Carica papaya
Family	Caricaceae
Origin	Tropical America (Mexico, Central America)
Sex types	Male, female, hermaphrodite (polygamous)
Preferred for cultivation	Hermaphrodite plants (self-pollinating + elongated fruits)
Propagation	Seeds (primary method)
Sex ratio	Cannot determine sex until flowering
Varieties	Pusa Delicious, Pusa Majesty, Pusa Dwarf, Coorg Honey Dew
Gynodioecious varieties	Have female + hermaphrodite only; preferred commercially
Papain	Proteolytic enzyme from unripe fruit latex
Papain uses	Meat tenderizer, medicine, textile industry
Fruit type	Berry
Major disease	Papaya ring spot virus (PRSV) — most devastating
Major disease	Foot rot (Pythium)
Major pest	Mealybug, aphids (vector for PRSV)
Spacing	1.8 x 1.8 m
Climate	Tropical; frost-sensitive; needs well-drained soil