Maturity signs of watermelon

Maturity signs of watermelon:- Fruits are ready for harvest in 90 to 120 days from sowing. Ripe fruits, when thumped with fingers, give out heavy dull sound, whereas the immature fruits give metallic sound.

  • Fruits are ready for harvest in 90 to 120 days from sowing.
  • Ripe fruits, when thumped with fingers, give out heavy dull sound, whereas the immature fruits give metallic sound.
  • The change from white to cream or pale yellow of the skin area where the melon has been resting on the soil.
  • Shriveling of tendrils on nodes to which melons are attached.
  • Slight ribbing on surface of fruit can indicate maturity in some varieties.

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Anthracnose control in watermelon

Anthracnose control in watermelon:- Clean cultivation and crop rotation minimize disease incidence. Treat the seed with Carbendazim 50% WP @ 2.5 gm/kg.  

  • Clean cultivation and crop rotation minimize disease incidence.
  • Treat the seed with Carbendazim 50% WP @ 2.5 gm/kg.  
  • Spray Mancozeb 75% WP @ 400 gm/acre or chlorothalonil 75% WP @ 300 gm/acre at 10 days intervals.

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Downy mildew control in watermelon

Downy mildew control in watermelon:- Water soaked lesions appear on undersurface of leaf lamina. Angular spots appear on upper surface similar to water-soaked lesions.

  • Water soaked lesions appear on undersurface of leaf lamina.
  • Angular spots appear on upper surface similar to water-soaked lesions.
  • Lesions appear first on the older leaves and progressively on the younger leaves.
  • As the lesions expand, they may remain yellow or become dry and brown.
  • Affected vines do not set fruit properly.
  • Plucking and destroy of affected leaves.
  • Spray with Mancozeb 75% WP @ 350-400 gm/acre or Chlorothalonil 75% WP @ 200-250 gm/ acre.
  • Crop rotation and sanitation reduces the severity of the disease.

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Control measures of root-knot nematode in watermelon

Control measures of root-knot nematode in watermelon:-The female deposits eggs in or on the roots, or in decaying root debris. The juveniles hatch from the eggs and move toward root

  • The female deposits eggs in or on the roots, or in decaying root debris.
  • The juveniles hatch from the eggs and move toward root tips or minor wounds. They feed on root tissue.
  • The nematode attacks the roots and produces tiny galls.
  • The infested plants show symptoms of withering and wilting of leaves.
  • They block the movement of nutrients and water in the plant system and subjected to wilt and finally leads to death.
  • Growth of the plant is stunted and fruiting capacity adversely affected.
  • Yellowing of the foliage and wilting of the upper leaves occurs.
  • Do use deep summer ploughing and soil solarization to control root-knot nematode.
  • Neem cake @ 200kg/ha for effective control.
  • Use Paecilomyces Lilacinus 1 % wp Mix 2 – 4 kg per acre in 50 kg well rotten Fym/compost/vermicompost/field soil and then incorporate in the field at the time of field preparation, sowing/transplanting. for effective control of Root-knot nematodes infection.

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Blossom-end rot in watermelon

Blossom-end rot in watermelon:- Blossom end rot is a dark, rotten spot that occurs at the end of a fruit.
Usually, this occurs as a result of inconsistent available water supply.

  • Blossom end rot is a dark, rotten spot that occurs at the end of a fruit.
  • Usually, this occurs as a result of inconsistent available water supply.
  • When the soil becomes too dry for a period of time, calcium becomes bound in the soil and is unavailable to the plants for fruit development.
  • Or isn’t enough calcium in the soil.

Management:-

  • Provide watermelons with 1 to 1-1.5 inches of water each week during fruiting to help avoid blossom end rot.
  • Protect your crop by applying a plastic mulch or 2 to 4 inches of organic mulch around the watermelon crown and under its leaves.
  • Use of calcium nitrate with the amount of 25 kg/acre will be beneficial for calcium deficiency in the soil.
  • Spray of chelated calcium EDTA @ 200 gm/acre at flowering stage.

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Pinching in watermelon

Pinching in watermelon:- Pinches are made to prevent overgrowth of watermelon from the plant. When there is enough fruit on the oxen of watermelon, then there should be a solution.

  • Pinches are made to prevent overgrowth of watermelon from the plant.
  • When there is enough fruit on the oxen of watermelon, then there should be a solution to pinch, which can prevent the bull from failing.
  • Pinching and cutting of unwanted wounds results in good nutrition for the fruit and the development of the fruits is good.
  • If there is more fruit on a vine, then remove the small and weak fruits so that the main fruit gets better.
  • By removing unnecessary branches, watermelon gets complete nutrition and it grow very fast.

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Boron deficiency symptoms and control in watermelon

Boron deficiency symptoms and control in watermelon:- Young leaves are smaller than normal and may be curled. Yellowing proceeds from the marginal area between the veins towards the center.

  • Young leaves are smaller than normal and may be curled.
  • Yellowing proceeds from the marginal area between the veins towards the center.
  • The youngest leaves show necrotic tips.
  • Stems can crack due to the low cell strength.
  • Plants are stunted or dwarfed as the internodes are shortened.
  • Growing points die back.
  • Flowering and fruit set is poor.
  • Fruits are distorted with a poor skin finish.
  • Hollow heart is more common.
  • Deficiencies usually occur when soil moisture contents are too high, or under conditions of high pH.

Control :-

  • Use of calcium nitrate with added boron fertliizer @ 25 kg/acre.
  • Use of phosphate solubilizing bacteria @ 4 kg per acre.
  • Spray of boron 20% @ 200 gm per acre twice in 10 days at flowering stage.

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Control measures of aphids in Watermelon

Control measures of aphid in Watermelon:- The affected plants have to be uprooted and destroyed to prevent the spread of the disease.

  • The affected plants have to be uprooted and destroyed to prevent the spread of the disease.
  • For effective control of aphid fortnightly spray of acephate 75 % SP @ 300- 400 gm / acre or Imidacloprid 17.8% SL @100 ml /acre or acetamiprid 20% SP @ 150-200 gm/ acre.

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Control measures of thrips in watermelon

Control measures of thrips in watermelon:- Both adults and nymphs damage the crop lacerate the leaf tissue and suck the sap. Tender shoots, buds, and flowers are attacked

  • Both adults and nymphs damage the crop lacerate the leaf tissue and suck the sap.
  • Tender shoots, buds, and flowers are attacked as a result they become twisted and deformed, upward curling of leaves.
  • Spray Dimethoate 30% EC @ 250 ml/acre or Profenophos 50% EC @ 400 ml/acre or Fipronil 5% SC @ 400 ml/acre at fortnightly interval.
  • Pesticide spraying should be changed at every 15 days interval.

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Advantage of PSB in watermelon

Advantage of Phosphorus Solubilizing bacteria in watermelon:- Increase micronutrients availability to plant from the soil like Mn, Mg, Fe, Mo, B, Zn and Cu in addition to P2O5.

  • Increase micronutrients availability to plant from the soil like Mn, Mg, Fe, Mo, B, Zn and Cu in addition to P2O5.
  • Encourage faster root growth for water and nutrient uptake.
  • PSB produce organic acids like malic, succinic, fumaric, citric, tartaric acid and acetic acid which fasten the P2O5 uptake, maturity and increase yield.
  • Increase resistance towards diseases and drought tolerance due to rapid cell development in the plants.
  • Reduce 25 – 30% phosphatic fertilizer requirement.

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