Whitefly update December 2016

In 2016 field trials have been carried out in Sweden in cabbage and broccoli on control of Plutella, and in Greece in tomato. Trials in protected crops were done in Greece in tomato and in Sicily in aubergine and sweet pepper on control ofwhitefly. Spores of two Isaria sp. in two formulations have been compared to the blank formulations with no effective ingredients, a chemical commercial product, a commercial biological control productand an untreated control.

Bayer Crop Science Biologics GmbH took care of the production and formulation of the Isaria sp. spore samples and supported and coordinated the field trials. ARA Testing Facility performed the greenhouse trials on Sicily, Italy, Hellafarm S.A. did trials in Greece and Agro Plantarum in Sweden.

Results of the field trials

  • Results of the field trials showed that the efficacy of the Isaria biological control agents in Greece was higher in protected tomato than in the field, probably due to lower humidity in the field. There was no significant difference between efficacies of the two Isaria biological control agents. Their efficacies were at least similar to the efficacy of the biological insecticide reference product.
  • The field trials in Sweden in early cabbage, winter cabbage and broccoli showed that the effects of the Isaria biological control agents on Plutella xylostella were about the same as the effect of a chemical product.
  • In Sicily both Isaria biological control agents efficiently reduced the pest population on a mature crop with a declining whitefly population, although the chemical product provided better results. On a fast growing crop with a very high whitefly population pressure only the chemical product was effective. For the Isaria trial samples, the blank formulations and the biological insecticide same results were obtained as for the untreated trial.

See our earlier updates on the whitefly research:

Read more about our activities on whitefly

Author

Ute Eiben
Ute Eiben
Whitefly in vegetables
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