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The use of the micro-parasitic wasps Encarsia formosa and Eretmocerus eremicus against whiteflies ( Bemisia tabaci and Trialeurodes vaporariorum ) of tomato under cover in Réunion

  • Target: whitefly larvae (they turn yellow or black when parasitized).
  • Mode of presentation of the auxiliaries: platelets containing the pupae of parasitized whiteflies from which emerge the parasitoid wasps.
  • Storage of auxiliaries: in the dark between 4 and 10°C, do not store for more than one week because the rate of emergence of micro-wasps decreases rapidly.
  • Mode of application: hang the plates on the plants by distributing them in the greenhouse, avoid exposure to direct light.
  • Dose and frequency of application: the number of releases depends on the parasite pressure; in general, it takes at least 2 releases with at least 3 to 4 parasitized larvae per m2.
  • Conditions of application: introduce auxiliaries as soon as possible after the observation of the infestation.
  • Recommended combination with other means of protection:
    • visual traps (sticky yellow panels).
    • anti-insect nets with an adequate mesh.
    • good prophylaxis (defoliation of the base of the plants, maintenance of the greenhouse, etc.).
    • limited and localized phytosanitary treatments during the crop cycle, using products with little or no toxicity for auxiliaries.


Other examples

The micro-hymenoptera Aphidius colemani against the aphids Aphis gossypii on cucumber and pepper under shelter in Reunion, the predatory mite Phytoseiulus persimilis against the mite Tetranychus evansi of solanaceae in Reunion.

Last change : 07/07/22