Linseed, one of the oldest cultivated crops, is again gaining in importance, mainly due to its
nutritional benefi ts and biomedical applications. Th erefore, it is expected that herbivores will
also exist in greater abundance. Among them the fl ea beetle, Aphthona euphorbiae Schrank
and Longitarsus parvulus Paykull are considered to be serious pests of fl ax grown for fi bre
and seeds in Europe. Th e aim of this study was to determine fl ax fl ea beetles’ abundance, species
richness and seasonal dynamics on linseed grown at diff erent densities. It was expected
that linseed seeding density can signifi cantly aff ect fl ea beetle populations. Th e experiment
was carried out in Lower Silesia, Poland, from 2011 to 2013. A genetically modifi ed type of
linseed overproducing fl avonoids was used. Flea beetles and the damages they caused were
determined on plants and also a sweep net was used for the collection of adult beetles. During
the three years of the study 15 species of fl ea beetles were identifi ed from oil fl ax plants,
with A. euphorbiae and L. parvulus being dominant. In terms of the total catch, the tendency
was for beetle numbers to decrease with increasing plant density. Flax fl ea beetles feeding on
linseed plants, irrespective of plant density, had two peaks of abundance. Th e fi rst peak was
lower and occurred in June, when plants were at the blooming stage. Th is peak was caused by
overwintering adults who colonized crops in spring. Th e second, higher peak of abundance
was recorded in the second half of July, when plants were at the ripening stage. Th is peak was
formed by adults of the new generation. Each year, at the higher population peak of abundance,
the fl ea beetles were most numerous on plants grown at the lowest density. Th ere was
one period, lasting either from mid-May to the fi rst few days of June, or from the beginning
of June to mid-June, during which the number of holes and damage on plants of each treatment
were highest. During the three years of the study there were several cases of signifi cantly
higher numbers of fl ea beetle feeding symptoms on plants grown at the lowest density as
compared to the medium and highest densities.
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