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Fluoride effects on the mulberry-silkworm system.

J X Wang1, Y M Bian

  • 1Jiangsu Institute of Botany, Nanjing, People's Republic of China.

Environmental Pollution (Barking, Essex : 1987)
|January 1, 1988
PubMed
Summary

Fluoride absorbed by mulberry leaves from air harms silkworms. High fluoride levels in leaves inhibit silkworm growth and severely reduce cocoon production, indicating an environmental impact on sericulture.

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Area of Science:

  • Environmental Science
  • Toxicology
  • Entomology

Background:

  • Fluoride (F) is an atmospheric pollutant.
  • Mulberry leaves are a primary food source for silkworms.
  • Understanding fluoride's impact on agriculture and livestock is crucial.

Purpose of the Study:

  • To investigate fluoride absorption by mulberry leaves from ambient air.
  • To determine the effects of fluoride-contaminated mulberry leaves on silkworm development.
  • To elucidate the environmental cycle of fluoride in a mulberry-silkworm ecosystem.

Main Methods:

  • Monitoring ambient air fluoride concentrations using lime filter papers.
  • Quantifying fluoride content in mulberry leaves.
  • Assessing silkworm growth, development, and cocoon production based on leaf fluoride levels.

Main Results:

  • Mulberry leaves absorbed fluoride from ambient air.
  • Fluoride levels in leaves exceeding 30 ppm (when air F > 1.5 microg dm(-2).day(-1)) injured silkworm larvae.
  • Leaves with >80 ppm fluoride severely inhibited cocoon production.
  • Fluoride was observed to cycle between leaves, silkworms, soil, and atmosphere.

Conclusions:

  • Atmospheric fluoride poses a significant risk to silkworm cultivation.
  • Mulberry leaves act as accumulators and vectors of fluoride toxicity.
  • The fluoride cycle impacts agricultural ecosystems and necessitates environmental monitoring.

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