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A malathion-tolerant strain of the spiderChiracanthium mildei and its response to chlorpyrifos

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Chiracanthium mildei L. Koch (Araneae: Clubionidae) spiders, from two populations, were collected and reared in the laboratory. One originated from a citrus grove at Kibbutz Afeq and the other from an experimental cotton field at the Newe Ya’ar Experiment Station. Laboratory evaluation indicated that the Afeq strain was more tolerant to malathion than the Newe Ya’ar strain (resistance factor of x3.3).

When spiders of the Afeq strain were exposed to chlorypyrifos (Dursban) and malathion residues, chlorpyrifos was much more toxic.

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Correspondence to F. Mansour.

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Mansour, F. A malathion-tolerant strain of the spiderChiracanthium mildei and its response to chlorpyrifos. Phytoparasitica 12, 163–166 (1984). https://doi.org/10.1007/BF02981168

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Key Words

  • Chiracanthium mildei
  • malathion
  • chlorpyrifos
  • resistance factor
  • citrus
  • cotton