Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Efficiency of spinosad, Bacillus thuringiensis and Trichogramma brassicae against the tomato leafminer in greenhouse.

Abstract

The objective of this study was to evaluate the efficacy of three eco-friendly control agents, either singly or in a pairwise combination, for the control of the tomato leafminer, Tuta absoluta (Meyrick) (Lep: Gelechiidae). They include the naturally derived pesticide spinosad, a commercially available formulation of Bacillus thuringiensis var. Kurstaki (Bt), and a native population of Trichogramma brassicae Bezdenko (Hym: Trichogrammatidae). Tomato plants containing the T. absoluta were treated with one of the seven following treatments in a greenhouse: (1) a single release of T. brassicae against the eggs; (2) two applications of Bt (2 kg ha-1); (3) and (4) one application of spinosad at two rates (60 and 120 g a.i. ha-1); (5) T. brassicae release+Bt spray; (6) T. brassicae release+spinosad spray; and (7) spinosad spray+Bt spray. The highest mortality rate was recorded for the spinosad+Bt (88.33±1.43%) and T. brassicae+spinosad (78.33±3.74%) combinations, respectively; while the lowest mortality rate was obtained through the single application of T. brassicae (31.67±4.84%). Based on our results, the Bt and spinosad seem to be suitable candidates for combination with other biological and cultural techniques towards an integrated management of the tomato leafminer.