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Article

Effects of Agronomic Practices on the Severity of Sweet Basil Downy Mildew (Peronospora belbahrii)

1
Department of Plant Pathology and Weed Research, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
2
Agroecology and Plant Health, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel
*
Author to whom correspondence should be addressed.
Academic Editor: Francesca Degola
Plants 2021, 10(5), 907; https://doi.org/10.3390/plants10050907
Received: 4 April 2021 / Revised: 25 April 2021 / Accepted: 28 April 2021 / Published: 30 April 2021
(This article belongs to the Special Issue Weaponizing Plants: Biocontrol and Biosecurity in Plant Protection)
Downy mildew (caused by Peronospora belbahrii) is a severe disease of sweet basil (Ocimum basilicum) crops around the world. We examined cultural methods for reducing the severity of sweet basil downy mildew (SBDM) under commercial conditions in greenhouses and walk-in tunnels. The effects of the orientation of walk-in tunnels, air circulation in greenhouses, plant density, and soil mulch were tested. SBDM was less severe in the tunnels that were oriented north-south than in those oriented east-west, but the yields in both types of tunnels were similar. Increased air circulation reduced SBDM severity, but did not affect yield. Gray or transparent polyethylene mulch reduced SBDM severity and, in most cases, increased yield relative to bare soil/growth medium. Yellow polyethylene mulch provided a smaller amount of control. The combination of increased air circulation and yellow polyethylene mulch provided synergistic SBDM control, whereas no synergism was observed when we combined increased air circulation with the other two types of mulch. Planting at half the usual density reduced disease severity. The reduced plant density was associated with reduced yield in the greenhouses, but not in the tunnels. All of the tested methods provided an intermediate level of SBDM control that varied among the different experiments. View Full-Text
Keywords: agrotechnical control; cultural control; integrated management; downy mildew; greenhouse crop; plant disease; Ocimum basilicum; Peronospora belbahrii agrotechnical control; cultural control; integrated management; downy mildew; greenhouse crop; plant disease; Ocimum basilicum; Peronospora belbahrii
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MDPI and ACS Style

Omer, C.; Nisan, Z.; Rav-David, D.; Elad, Y. Effects of Agronomic Practices on the Severity of Sweet Basil Downy Mildew (Peronospora belbahrii). Plants 2021, 10, 907. https://doi.org/10.3390/plants10050907

AMA Style

Omer C, Nisan Z, Rav-David D, Elad Y. Effects of Agronomic Practices on the Severity of Sweet Basil Downy Mildew (Peronospora belbahrii). Plants. 2021; 10(5):907. https://doi.org/10.3390/plants10050907

Chicago/Turabian Style

Omer, Chen, Ziv Nisan, Dalia Rav-David, and Yigal Elad. 2021. "Effects of Agronomic Practices on the Severity of Sweet Basil Downy Mildew (Peronospora belbahrii)" Plants 10, no. 5: 907. https://doi.org/10.3390/plants10050907

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