Assessing the non-targeted effect of copper on the leaf arthropods communities in a vineyard

In this study, we monitored simultaneously the direct effect of Bordeaux mixture on three grapevine leaf diseases and five leaf arthropods (beneficial and/or pest) over 4 months in 2014 and 2015, under field conditions. We found a strong interaction between the sampling years and the treatments within all tested organisms. Overall, the presence of copper generally decreases the occurrence of disease and the densities of leaf arthropods; though primarily in 2014, more likely because of the contrasted climatic conditions between the years. Thus, copper reduces some pest densities but also biological agent densities which might interfere with biological control. These effects should be considered in crop management for a more efficient pest control and to avoid seasonal and economical losses.
Source: Biological Control - Category: Biology Source Type: research