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Tuta absoluta  (Meyrick) (Lepidoptera: Gelechiidae) is the most destructive pest of tomato worldwide. Biological control has always been considered as a promising management approach of this pest in tomatoes. In this context, we evaluated the effectiveness of releasing  Trichogramma cacoeciae  Marchal parasitoids or  Macrolophus pygmaeus  (Rambur) predators in controlling  T. absoluta  in greenhouse tomatoes of northeastern Tunisia. Two weekly releases of either  M. pygmaeus  at 1 adult/m 2  or  T. cacoeciae  at 20 adults/plant were assessed. Our results indicated that parasitism rates were significantly higher on the apical tomato leaves compared to the middle leaves. We found that the number of  T. absoluta  eggs and larvae was significantly reduced after releasing  T. cacoeciae , while releases of  M. pygmaeus  did not significantly reduce  T. absoluta  densities. The present study demonstrated the great potential of releasing  T. cacoeciae  in controlling  T. absoluta  in greenhouse tomatoes of northeastern Tunisia. However, further studies are needed to evaluate other release rates of  M. pygmaeus  that could show promising effectiveness against  T. absoluta  in northeastern Tunisian greenhouses.

biocontrol science and technology

Biological control of  Tuta absoluta  through releases of  Trichogramma cacoeciae  parasitoids and  Macrolophus pygmaeus  predators in northeastern Tunisian greenhouses