Impact of the erineum mite on Muscat | Nuisibilité de l'érinose sur le cépage Muscat
2009
Linder, Ch., Station de recherche Agroscope Changins-Waedenswil ACW, Nyon (Switzerland) | Jermini, M. | Zufferey, V.
The erineum mite Colomerus vitis is widespread in Swiss vineyards, but its pest status is still unclear. Damages of C. vitis are rarely serious. Nonetheless acaricides are occasionally applied, although these products are moderately toxic to predatory mites. For a better understanding of erineum mites impact on vine, harmfulness of C. vitis was studied from 2005 to 2007 on the variety Muscat. At the time of the most severe mite infestation, about 3% of leaves had more than 60% of the leaf area damaged. Nevertheless, mites had almost no effect on transpiration rates measured. Photosynthesis and stomatal conductance rates slightly decreased on heavily infested leaves while chlorophyll index was unaffected. The presence of mites had also no effect on shoot growth and foliation. Overall, individual plant damage was neither correlated with overwintering mite population nor with plant damage in the previous year. In conclusion, C. vitis impact on photosynthesis is negligible and acaricide treatment can be abandoned at moderate pest infestations.
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