(Hungarian National Laboratory Program, grant number RRF-2.3.1-21-2022-00007)
Szakterületek:
Mezőgazdaság
Növénytermesztés és növényvédelem
Damage caused by Brassicogethes aeneus primarily affects the reproductive organs of
rapeseed, disrupting fertilization and often leading to premature pod opening. In
addition to direct yield loss, it is hypothesized that injury to generative tissues
may also alter seed nutrient composition, particularly the unsaturated fatty acid
profile, which is a key determinant of rapeseed quality. To assess this indirect effect,
field experiments were conducted in 2024–2025, and seed samples were collected after
ripening. The study aimed to evaluate pest-induced variation in nutrient content under
different insecticide treatments. Alongside an untreated control, two active substances
were tested: a systemic insecticide (acetamiprid) and a combined formulation of acetamiprid
and lambda-cyhalothrin. Our results demonstrated that the widely used active insecticides
are not effective against B. aeneus adults. Checking the fatty acid (FA) profile,
within saturated FAs, the proportion of palmitic acid (C16:0) was the highest in the
control; the single and combined pesticide treatments were characterized by increasing
LA (C18:2n6) and ALA (C18:3n3) levels, in which both FAs exhibited a linear pattern
with the single and combined treatments. In MUFAs, the most important finding was
the negligible level of erucic acid (C22:1n9) below the detection limit. Oleic acid
(C18:1n9) proportion was generally high (~50) and significantly decreased in treated
groups. Oil quality affection highlights the importance of effective pest management
to maintain the nutritional and technological value of rapeseed, as shifts in the
n6:n3 ratio and thrombogenic index reflect stress responses rather than agronomic
benefits.
