THE ROLE OF TANNINS IN THE RESISTANCE OF HAZELNUT CULTIVATED IN POLAND TO THE MAJOR PESTS

A consequence of increased interest in hazelnut cultivation in Poland in recent years, as well as the development of methods of integrated protection, is an interest in cultivars which – except for their productive values – show the features of resistance to pathogens and pests.
Cultivar resistance is usually highly stable over the years, regardless of the pest population in a given vegetation year.
The aim of the studies was to find out the factors conditioning resistance of the cultivars cultivated in Poland to two dangerous pests: filbert big bud mite (Phytoptus avellanae Nal.) and filbert aphid (Myzocallis coryli Goetze). Four hazelnut cultivars with distinct differences in resistance to the examined pests were selected for the studies.
Complete resistance to the studied pests was not found in any of these.
The cultivar ‘White Filbert’ showed partial resistance to hazel aphid, ‘Hall’s Giant’ showed resistance to filbert big bud mite, while the ‘Luizen Zellernuss’ cultivar was characterized by partial and combined resistance to both pests.
The greatest susceptibility to the feeding of mites and aphids was observed in the cultivar ‘Minnas’. The present results point out that the most important source of constitutive resistance of hazelnut to filbert big bud mite and filbert aphid is found in the content of nutritious substances, including secondary metabolites, mainly tannins.
Cultivation of hazel cultivars of increased resistance both to filbert big bud mite and filbert aphid could contribute to reduced populations of those pests and, consequently, to reduced losses caused by them, as well as to a decrease in the use of insecticides and the costs of hazel cultivation in our country.

VII International Congress on Hazelnut

M. Gantner

Phytoptus avellanae, Myzocallis coryli, secondary metabolites, tannins

https://doi.org/10.17660/ActaHortic.2009.845.73