AI Article Synopsis
- The study investigated how varying day lengths affect the production of conidia and the severity of diseases caused by Podosphaera pannosa in roses.
- It was found that extending artificial light from 18 to 24 hours per day led to a significant reduction in conidia production (by 22-62%) and decreased disease severity.
- These findings indicate that longer day lengths could help control powdery mildew, potentially reducing the reliance on fungicides.
Article Abstract
The effect of day length on production and germinability of conidia and severity of disease caused by Podosphaera pannosa, the causal agent of rose powdery mildew, was studied. Whole potted plants or detached leaves of Rosa interspecific hybrid 'Mistral' were inoculated with P. pannosa and exposed to 0, 12, 18, 20, 22, or 24 h of artificial light per day in growth chambers equipped with mercury lamps. Increasing duration of illumination from 18 to 20 to 24 h per day reduced production of conidia by 22 to 62%. Exposure to 24 h of illumination per day also strongly reduced disease severity compared with 18 h. Our results suggest that increasing day lengths from 18 h per day to 20 to 24 h may suppress the disease significantly and, thereby, reduce the need for fungicide applications against powdery mildew.
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| http://dx.doi.org/10.1094/PDIS-94-3-0339 | DOI Listing |
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