CHEMICAL WEED CONTROL IN CONDITIONS OF CLIMATE CHANGE

AUTHOR(S) / АУТОР(И): Zvonko Pacanoski

Faculty for Agricultural Sciences and Food, Ss. Cyril and Methodius University, Skopje, R. N. Macedonia

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DOI: 10.46793/MAK2025.035P

ABSTRACT / САЖЕТАК:

Elevate CO₂ levels in the atmosphere might have prominent consequences on weed phenology, subsequently changing herbicide behavior on weeds. Increased atmospheric CO₂ concentration strengthens leaf consistency and minimizes number of stomata and their conductivity potentially reducing the absorption of POST-em applied herbicides. On the other side, higher temperature stimulates stomata conductance, reduce the viscosity of epicuticle waxes, thus increasing the penetration and diffusion of herbicides because of modifications in the structure and the penetrability of the cuticle. However, in some circumstances higher temperatures might cause hastened metabolism, which consequently decreases herbicide activity on target plants. In conditions of higher RH, cuticle hydrating and stomatal conductivity increases, consequently increases the penetrability and translocation particularly of hydrophilic herbicides into the leaf surface. Similarly, under higher irradiance, stomata stay open, photosynthetic rate increases consequently increasing absorption, penetration and subsequent phloem translocation of POST-em systemic herbicides in weed plant tissue. Drought might cause increased cuticle thickness and intensify growth of leaf pubescence, with consequent minimization in herbicide absorption in the leaves. Rainfall after POST-em herbicides application might reduce their efficiency through washing out. Increased occurrence and intensiveness of precipitation will have negative consequences on absorption, translocation, and efficacy of PRE-m herbicides.

KEYWORDS / КЉУЧНЕ РЕЧИ:

Changing environmental conditions, Weeds, Herbicides

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