A weed of the United States, the Solanum elaeagnifoliumbecomes even more resistant and difficult to eradicate if it is mowed too frequently. This plant, native to the United States, has also spread to other parts of the world, such as South Africa, Greece and Italy, particularly Sardinia. Farmers tend to cut it down mercilessly, but a new study published in Scientific Reports suggests that this practice may be counterproductive.
An innovative study
The research group from the University of Texas conducted an analysis in depth on the plant near the city of Edinburgh. The researchers monitored several fields with different mowing frequencies: frequent, infrequent and non-mowing. After only one generation of mowing, Solanum elaeagnifolium proved to be extremely adaptable. It deepened its roots and increased the number of thorns, better protecting itself from the caterpillars that feed on them.
Solanum elaeagnifolium: the more you cut it, the more it grows
In addition to these physical defenses, the plant has increased the toxicity of its flowers, creating further problems for the caterpillars. But what is most worrying is that the mowed plants have produced more seeds, some of which have germinated earlier than usual, thus ensuring a greater chance of taking root. This phenomenon may not be limited to Solanum elaeagnifolium: other weeds of the same family may react in the same way.
In light of these findings, experts suggest rethinking current weed eradication strategies. Continuing to mow them could only make them stronger and more resistant, turning them into real superinfestants.
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