Bondi Junction NSW, Australia
Fact Sheets
Watermelon - Papaya ringspot (virus-W) (392)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds


  • Worldwide distribution. In Oceania, Australia, Cook Islands, FSM, Fiji, French Polynesia, Nauru, New Caledonia, Northern Mariana Islands, Tokelau, Tonga, Vanuatu. A virus of crops in the cucurbit family, and weeds.
  • Damage: distortions, blisters and light and dark mosaic patterns on leaves; ring spots on the fruits merging into large dark green areas. Yields are reduced and appearance affects sales.
  • Spread: aphids, and infected nursery plants. Aphids spread the virus quickly, but do not retain it for long.
  • Cultural control: in nursery - check each seedling; in field - avoid overlapping crops; remove weeds and 'volunteers';  limit people entering fields; rogue disease plants; nets or floating covers; mulches to repel aphids;  resistant varieties (zucchini); burn debris after harvest.
  • Chemical control: insecticides not recommended, although frequent sprays of soap, white and horticultural oils may have potential.

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