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What is rindworm? Investigating a poorly understood pest complex in watermelon.

Ian Kaplan1, Stephany Bautista1, Zeus Mateos-Fierro1

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Journal of Economic Entomology
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Fruit surface damage, or "rindworm," affects nearly 10% of watermelons, risking crop loss. This understudied pest complex requires targeted management strategies for effective control.

Keywords:
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Area of Science:

  • Agricultural Entomology
  • Horticultural Science
  • Pest Management

Background:

  • Watermelon (Citrullus lanatus) cultivation faces numerous arthropod pests, with research primarily addressing leaf and root feeders.
  • Pests causing fruit surface damage, termed "rindworm," are poorly understood despite economic implications.

Purpose of the Study:

  • To survey arthropod populations and quantify rind damage in commercial Indiana watermelon fields over two years.
  • To assess the economic impact of rind damage on watermelon marketability.

Main Methods:

  • Conducted a two-year survey across 32 commercial watermelon fields.
  • Performed visual surveys and photographic analysis to quantify rind blemish extent on over 10,000 melons.
  • Correlated pest population densities with observed rind injury.

Main Results:

  • Approximately 9% of surveyed melons exhibited insect feeding damage.
  • An estimated 14.9% of harvests were at risk of marketability loss due to rind injury.
  • Damage was significantly higher on the underside of fruits, on melons grown on soil versus plastic, and in field centers versus edges.

Conclusions:

  • "Rindworm" represents an economically significant and understudied pest issue in watermelon and cucurbit production.
  • Management strategies must consider the protected feeding location of these pests.
  • Timing of insecticide applications is crucial for mitigating late-season crop losses.