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Shedding the Light on Powdery Mildew: The Use of Optical Irradiation in Management of the Disease
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DOI：10.1146/annurev-phyto-021622-115201.png)
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Abstract
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Ultraviolet (UV) irradiation below 300 nm may control powdery mildewin numerous crops. Depending on disease pressure, wavelength, and cropgrowth stage, one to three applications of 100-200 J/m(2)per week at nightare as effective or better than the best fungicides. Higher doses may harmthe plants and reduce yields. Although red light alone or in combinationwith UV has a suppressive effect on powdery mildew, concomitant or sub-sequent exposure to blue light or UV-A strongly reduces the efficacy of UVtreatments.To be effective,direct exposure of the pathogen/infection sites toUV/red light is important,but there are clear indications for the involvementof induced resistance in the host. Other pathogens and pests are susceptibleto UV, but the effective dose may be phytotoxic. Although there are cer-tain limitations, this technology is gradually becoming more used in bothprotected and open-field commercial production systems.
Keywords:
optical radiation
red light
ultraviolet
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