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🇹🇼 Taiwan /Technology

NTU Team Explains Why Zebra Stripes Can Keep Insects from Landing

From Liberty Times · () Chinese

Translated from Chinese and summarized by DistantNews. Read the original for the full story.

At a glance

News Named sources Context piece
  • A National Taiwan University team found that stripes measuring 0.23 to 0.95 centimeters most effectively interfered with honeybees’ landing behavior.
  • The researchers say visual distortion caused by the stripes may make it harder for insects to judge flight and landing, potentially reducing bites and pest damage.
  • The team is testing patterned physical pest-control methods on crops and exploring uses in livestock, food facilities and outdoor clothing.

A National Taiwan University research team says it has identified why zebra-like patterns can reduce insect landings. The finding could support physical pest-control methods in agriculture, livestock farming and food production.

The team, led by entomology professor Yang En-cheng and doctoral student Hsieh Hsiang-wen, used honeybees to study how stripe width and direction affected flight and landing. The research found that neither the finest nor the thickest stripes worked best. Patterns between 0.23 and 0.95 centimeters wide produced the strongest interference with landing.

Yang said the effect may arise from the structure of insects’ compound eyes, which contain many small visual units and have limits in sampling images. Certain stripe widths may create spatial aliasing, disrupting the visual information bees use to judge flight and prepare to land.

It is not that the finer or coarser the stripes are, the stronger the interference with honeybee landings becomes.

— Yang En-chengHe described the finding that an intermediate stripe width had the strongest effect.

The researchers chose honeybees because of their flower constancy. Once bees find a reliable food source, they repeatedly return to the same target, making them suitable for behavioral experiments. The team trained the bees, changed the width and direction of the target’s stripes, and observed their flight and landing responses. The researchers said insect flight and landing mechanisms are broadly similar, allowing the findings to inform work on other insects.

The team has begun semi-field trials, including tests of different patterns on guava crops. The goal is to reduce the landing and egg-laying of oriental fruit flies and limit crop damage. The same approach could potentially help control biting flies at livestock farms, fruit flies and drain flies in food factories, restaurants and household food-waste areas. The researchers say using physical patterns could reduce reliance on agricultural chemicals and insecticides.

The patterns do not have to be black and white. Yang said designs can be tailored to the visual resolution of the compound eyes of the target insect. Possible future applications include outdoor sports clothing designed to help prevent attacks by hornets common in Taiwan. The team has applied for a Taiwanese patent, and its paper has appeared in the Journal of Comparative Physiology A.

These patterns do not necessarily have to be black-and-white zebra stripes.

— Yang En-chengHe explained that designs can be adapted to the visual resolution of different insects.
About this summary

Originally published by Liberty Times in Chinese. Translated, summarized, and contextualized automatically by DistantNews, with a note on how the source frames the story. Not individually reviewed before publishing. How this works.

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