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Biological Control of Mites in European Vineyards and the Impact of Natural Biological control of mites in European vineyards and the impact of natural vegetation Carlo Duso, Serge Kreiter, Marie-Stéphane Tixier, Alberto Pozzebon, Valeria Malagnini To cite this version: Carlo Duso, Serge Kreiter, Marie-Stéphane Tixier, Alberto Pozzebon, Valeria Malagnini. Biological control of mites in European vineyards and the impact of natural vegetation. ×12. International Congress of Acarology, Aug 2006, Amsterdam, Netherlands. 10.1007/978-90-481-9837-5_65. hal- 01231310 HAL Id: hal-01231310 https://hal.archives-ouvertes.fr/hal-01231310 Submitted on 19 Nov 2015 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Biological control of mites in European vineyards and the impact of natural vegetation Carlo Duso, Serge Kreiter1, Marie-Stéphane Tixier1, Alberto Pozzebon & Valeria Malagnini2 Department of Environmental Agronomy and Crop Science, University of Padova, Viale dell’Università, 16 - 35020 Legnaro (PD), Italy. E-mail: [email protected]; 1Montpellier SupAgro, UMR Centre de Biologie et de Gestion des Populations 1062 INRA/IRD/CIRAD/SupAgro, Campus International de Baillarguet, CS 30 016, 34988 Montferrier sur Lez cedex, France; 2FEM, via E. Mach, 1 38010 San Michele all’Adige (TN), Italy In vineyards, generalist phytoseiids are important in keeping phytophagous mites at economically acceptable levels. Among these predators, Typhlodromus pyri and Kampimodromus aberrans have proven to be most effective, because they increase in numbers in response to mite pests and alternative prey/food, they persist under conditions of prey scarcity, and they can tolerate several fungicides and insecticides. Natural colonization of commercial vineyards by phy- toseiids may take several years. Therefore, strains showing field resistance to certain insecticides (e.g., organophos- phates) and fungicides (e.g., mancozeb) are of practical interest. Here we report results obtained with releasing T. pyri and K. aberrans strains with different pesticide histories, with emphasis on factors affecting their persistence, i.e., alter- native food availability (pollen or downy mildew), leaf morphology, and selective pesticides. Natural vegetation sur- rounding vineyards may impact the densities of phytoseiids in neighbouring crops. For example, phytoseiid densities on plants surrounding vineyards under IPM in Southern France (Languedoc-Roussillon) were correlated with leaf struc- tures, and K. aberrans density appeared positively affected by high trichome densities and presence of domatia. Also pollen density was significantly correlated with trichome density and domatia (hair tufts). Predatory mites disperse mainly by air currents and hence their dispersion depends on wind intensity and direction. Crop colonization potential (speed, intensity, uniformity) was directly associated with phytoseiid densities and the proximity of natural vegetation. A deep, dense, and tall woody area with suitable host plants constitutes the stablest source of phytoseiids. Natural col- onization of vineyards by phytoseiid mites has great potential and it may well be promoted by careful management. Key words: Phytoseiids, Kampimodromus aberrans, dispersal, colonisation, woody areas, hedges, leaf morphology, pollen, fungi, IPM hytophagous mites, tetranychids in particular, have been Nicotina, 1996; Ragusa di Chiara & Tsolakis, 2001) and France Pconsidered good examples of pests induced by the use of (Kreiter et al., 2000; Tixier et al., 2000b). Typhlodromus pyri pesticides. This hypothesis also holds for mite pests on grape: Scheuten is the most common phytoseiid species on grapes tetranychid mites have a negligible impact in undisturbed in central Europe, Kampimodromus aberrans (Oudemans) is ecosystems or in organic vineyards, but in commercial vine- the most important in various southern regions, and yards they become pests due to treatments with pesticides Typhlodromus exhilaratus Ragusa plays a significant role in that harm their natural enemies. The spread of integrated the Mediterranean viticulture. Other species frequently pest management (IPM) in European viticulture in the 1980s found are Amblyseius andersoni (Chant) and Phytoseius and 1990s was associated with a decrease in the economic finitimus Ribaga. These species are considered to be general- importance of tetranychids. In several parts of Europe the ists (type III, after McMurtry & Croft, 1997), since they are reduction in pesticide use, the selection of compounds that characterised by their close association to host plants, a wide are relatively safe for beneficial arthropods, and the applica- food range, and an intra-plant distribution wider than that of tion of threshold levels for chemical control have increased their prey. They can persist when prey densities decline by the potential of natural enemies of tetranychid mites. surviving on alternative foods, they can regulate their popu- Whereas various predatory insects exert a significant lation densities, and compete successfully with other preda- role in suppressing mite outbreaks in vineyards, they are tors (McMurtry, 1992; McMurtry & Croft, 1997). These fea- attracted mainly by rather high densities of tetranychid tures can be recognized at various levels in generalist phyto- mites. Hence, their role in pest control is significant only seiids encountered in European vineyards. when relatively high tetranychid threshold levels are applied Evaluating Amblyseius andersoni, Kampimodromus (Duso & Pasqualetto, 1993). Phytoseiidae in European vine- yards are widely recognized as effective control agents, irre- aberrans, and Typhlodromus pyri in tetranychid control spective of the pest threshold level applied. A negative cor- Laboratory studies on food ranges have shown that T. pyri relation between tetranychids and phytoseiids in the field and A. andersoni develop and reproduce on tetranychids was reported by the first researchers working on this topic [e.g., Panonychus ulmi (Koch) and Eotetranychus carpini (e.g., Mathys, 1958). The numerical response of phytoseiid (Oudemans)], eriophyids [e.g., Colomerus vitis (Pagenstec- mites to densities of tetranychid mites is often spectacular her)], and pollen. Amblyseius andersoni exhibited shorter and, in contrast to insect predators, phytoseiids can persist developmental times and higher oviposition rates than T. under conditions of prey scarcity (Ivancich Gambaro, 1973; pyri, suggesting a higher intrinsic rate of increase (Duso & Girolami, 1981; Baillod et al., 1982). Camporese, 1991). Kampimodromus aberrans showed a sim- ilar food range, and demographic parameters closer to T. pyri European vineyards are dominated by generalist than to A. andersoni (Schausberger, 1992; Kasap, 2005; C phytoseiids Duso, unpubl.). In the last two decades faunistic surveys have been conduct- When released in experimental vineyards in north-east- ed on phytoseiids on grape in Europe. More than 20 species ern Italy, T. pyri and K. aberrans responded better to tetrany- have been recorded in vineyards in Italy (Castagnoli, 1989; chid population increases than A. andersoni (Duso, 1989). Trends in Acarology [2009] M.W. Sabelis & J. Bruin (eds.) 399 Carlo Duso, Serge Kreiter, Marie-Stéphane Tixier, Alberto Pozzebon & Valeria Malagnini Additional observations showed that in some situations A. to be ineffective towards E. carpini (Duso & Vettorazzo, andersoni can control P. ulmi in vineyards (Vila et al., 1989; 1999). Phytoseius finitimus populations reach higher densi- Camporese & Duso, 1996), but confirmed its poor perform- ties on hairy grape cultivars, which may affect interspecific ance towards E. carpini (Duso & Vettorazzo 1999). competition (Duso & Vettorazzo, 1999). Kampimodromus aberrans proved to be the most effective Role of alternative prey for generalist phytoseiids phytoseiid in controlling E. carpini in various European regions (Ivancich Gambaro, 1973; Duso, 1989; Villaronga et The importance of alternative prey for phytoseiids has been al., 1991; Kreiter et al., 1993). widely debated in relation to the control of tetranychids Amblyseius andersoni proved to be a key predator of P. (Helle & Sabelis, 1985). Generalist feeding habits are a fun- ulmi in fruit orchards in northern Italy, south-west France, damental requirement for the persistence of predatory and other European regions, and its pesticide resistance con- mites and for the success of biological control. Generalist tributed to this status (Ivancich Gambaro, 1986; S Kreiter, phytoseiids can prey upon tenuipalpids, eriophyoids, tydei- unpubl.). Its role in vineyards is certainly less important than ds, winterschmidtiids, young stages of thrips, and coccids. in orchards: populations may crash suddenly despite pesti- These preys can support survival, development, or reproduc- cide resistance and resurge late in the season. This phenom- tion to various measures. However, it must be stressed that enon is most likely due to this species’ relative humidity some of these phytophagous species can reach pest status. requirements. Moreover, A. andersoni is less well able to
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