Mycotoxin Contamination of Wild Plants in Agricultural Landscapes: Seasonal Dynamics and the Underestimated Role of Woody Species

Abstract

Mycotoxin research has traditionally focused on cultivated crops, whereas wild plants growing in semi-natural vegetation remain largely unexplored despite their possible ecological importance. This study presents a comprehensive assessment of the occurrence, seasonal dynamics, organ-specific distribution, and growth-form differences of aflatoxin B1 (AFB1), deoxynivalenol (DON), and zearalenone (ZEN) in wild plant species from agricultural areas of the Hungarian Plain. A total of 134 samples collected in July, August, and October were analyzed for mycotoxin contamination. All three mycotoxins were frequently detected, and only 13% of samples were free of the investigated toxins. Mycotoxin profiles changed seasonally, with multi-toxin co-occurrence predominating in July, ZEN in August, and DON in October, whereas AFB1 declined toward the end of the growing season. Growth form explained contamination patterns more strongly than plant organ: woody species showed higher AFB1 and DON contamination, whereas grasses showed higher ZEN concentrations. Although most concentrations were low, occasional extreme values approached or exceeded European Union reference values for animal feed. Our findings identify semi-natural vegetation, particularly woody species, as a previously underestimated reservoir of mycotoxins and demonstrate that seasonal dynamics and plant growth form should be considered when assessing environmental mycotoxin exposure in agricultural landscapes.