UDC 632.51:633.63
DOI 10.36461/NP.2025.76.4.013
WEED INFESTATION OF SUGAR BEET CROPS IN PENZA REGION
E.V. Zheryakov, Candidate of Agricultural Sciences, Associate Professor;
S.A. Semina, Doctor of Agriculture Sciences, Professor
Penza State Agrarian University, Penza, Russia,
e-mail:
The monitoring of sugar beet crops phytosanitary conditions was carried out in the Penza Region from 1998 to 2018. A more complex weed structure was found with hard-to-eradicate perennial varieties predomi-nating. The infestation dynamics of root-suckering weeds increased from 1.1 to 6.1 pcs/m², while the number of sow thistle and milk thistle increased from 6.40 to 14.10 pcs/m². The annual dicotyledonous varieties were dominated in the weed structure with 51.01-56.73%, represented primarily by Amaranthus retroflexus L. and Chenopodium album L. The germination period of weed seeds was extended with the maximum number of seedlings in May-June. The high efficacy of triple application of combined herbicides (betanal group in combi-nation with triflusulfuron-methyl) during the most vulnerable stages of weed lifecycle was experimentally proved. The biological efficacy of the herbicides (94.7-98.5%) was proved to be dependent on the phenological stage of weed lifecycle. Temporal trends in the transformation of weeds in sugar beet agrocenoses were iden-tified, and critical periods of maximum weed vulnerability to the herbicide treatment were observed.
Keywords: sugar beet, weeds, phytosanitary monitoring, herbicides, biological efficiency, weed infesta-tion.
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