Potential of biostimulants in basil (Ocimum basilicum L.) and their effect on downy mildew, Peronospora belbahrii (Peronosporales: Peronosporaceae)
Keywords:
Culinary herbs, vegetative growth, biocontrol, infection, pathogenAbstract
Downy mildew in basil, caused by Peronospora belbahrii, leads to significant losses in yield, quality and market availability. Its control is commonly achieved through the use of chemical fungicides; however, their application is limited due to environmental concerns. The use of biostimulants to enhance plant vigor may represent a safer alternative for managing this pathogen. This study evaluated the effect of five biostimulants based on vermicompost leachate and humus, Trichoderma harzianum, Bacillus amyloliquefaciens and Sargassum spp. extract on basil morphometric traits, as well as on the incidence and severity of downy mildew. The results showed no significant effects on plant growth; however, all treatments significantly reduced the incidence and severity of P. belbahrii, where humus and worm leachate were most effective (60 % and 80 % respectively). It is concluded that, although not all biostimulants enhance plant growth in basil, they can act effectively reduce the incidence of downy mildew.
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