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Influence of soil texture, moisture, and surface cracks on the performance of a root-feeding flea beetle, Longitarsus

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  • 1Weeds Research Division, ARC-Plant Protection Research Institute, P/Bag X134, Pretoria 0001, South Africa. simelaned@arc.agric.za

Environmental Entomology
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Summary

Clayey, moderately moist soils with surface cracks favor the survival of the root-feeding flea beetle, Longitarsus bethae, a natural enemy of Lantana camara. These conditions promote higher egg-laying and larval survival, indicating optimal sites for biological control.

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Area of Science:

  • Ecology
  • Entomology
  • Biological Control

Background:

  • Lantana camara is an invasive weed, necessitating effective natural enemies for control.
  • Longitarsus bethae is a root-feeding flea beetle identified as a natural enemy of Lantana camara.

Purpose of the Study:

  • To investigate the influence of soil texture, moisture, and surface cracks on the survival and preference of adult and immature Longitarsus bethae.
  • To identify optimal environmental conditions for the establishment and efficacy of Longitarsus bethae as a biological control agent for Lantana camara.

Main Methods:

  • Laboratory experiments were conducted to assess adult feeding, oviposition preference, and immature survival of Longitarsus bethae.
  • Evaluated four soil textures (clayey, silty loam, sandy loam, sandy), three moisture levels (low, moderate, high), and two surface conditions (cracked, non-cracked).
  • Measured egg laying, larval survival rates, and adult emergence across different soil parameters.

Main Results:

  • Soil texture significantly influenced oviposition, with a preference for clayey and sandy soils. Survival to adulthood was highest in clayey soils.
  • Moderately moist soils significantly increased survival of immature stages, while high moisture slowed development.
  • Females laid approximately three times more eggs on cracked soils compared to non-cracked soils.

Conclusions:

  • Clayey and moderately moist soils, particularly those with surface cracks, are predicted to favor Longitarsus bethae survival and establishment.
  • These findings are crucial for selecting suitable release sites to enhance the biological control of Lantana camara using Longitarsus bethae.
  • Optimal conditions identified can lead to increased root damage by Longitarsus bethae, contributing to effective weed management.