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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 75, No. 1, 2015, pp. 63-70
Bioline Code: cj15009
Full paper language: English
Document type: Study
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 75, No. 1, 2015, pp. 63-70

 en Multiple natural enemies do not improve two spotted spider mite and flower western thrips control in strawberry tunnels
Albendín, Gemma; Del Castillo García, María & Molina, José María

Abstract

Biological control techniques are commonly used in many horticultural crops in Spain, however the application of these techniques to Spanish strawberries are relatively recent. In this study the effectiveness of augmentative biological control techniques to control the two main strawberry ( Fragaria check for this species in other resources ×ananassa Duchesne) pest: the two-spotted spider mite (TSSM), Tetranychus urticae check for this species in other resources Koch (Acari: Tetranychidae), and the western flower thrips (WFT), Frankliniella occidentalis check for this species in other resources (Pergande) (Thysanoptera: Thripidae), through releases of the predatory mites Phytoseiulus persimilis check for this species in other resources Athias-Henriot, Neoseiulus californicus check for this species in other resources (McGregor), Amblyseius swirskii check for this species in other resources Athias-Henriot (Acari: Phytoseiidae), and Orius laevigatus (Fieber) (Heteroptera: Anthocoridae) were tested. Two-year results on the performance of treatments using combinations of these biocontrol agents are presented. In both years, all treatments resulted in the reduction of TSSM numbers; but no treatment was better than the release of P. persimilis alone (P < 0.05). TSSM suppression varied among crop phases being greater early in the season. None of the treatments reduced significantly WFT numbers (P < 0.05), and the established economic injury level (EIL) was surpassed from March to late April in both years. However, EIL was surpassed less times when treatment included O. laevigatus (2009: 20.7%; 2010: 22.7% of samples). No effect of A. swirskii was observed when this mite was released. Results corroborate that biological control techniques for TSSM and WFT are feasible for high-plastic tunnel strawberries. Under the conditions in our study no additive effects were observed, and there was not advantage in the release of multiple natural enemies.

Keywords
Biological control; combined releases; Fragaria×ananassa; Frankliniella occidentalis; Orius laevigatus; Phytoseiids; Tetranychus urticae

 
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