Passive heat treatment of sweet basil crops suppresses<i>Peronospora belbahrii</i>downy mildew

Elad, Y.; Omer, Chen; Nisan, Ziv; Harari, Dafna; Gören, Hatice Kübra; Adler, U.; Silverman, David L.; Biton, S.

doi:10.1111/aab.12269

Cited by 26 publications

(48 citation statements)

References 32 publications

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“…The microclimate data are not presented. A sample set of microclimate data was presented in a previous publication, in which RH data and temperatures for the 2012/13 winter season were presented (Elad et al ., ).…”

Section: Methodsmentioning

confidence: 97%

“…Thus, passive heating methods were allocated each to two to seven tunnels, either as stand‐alone methods or in combination. All of these methods allow the absorbance of solar irradiation and accumulation of heat energy during the sunny hours and the heating of the structure throughout the day (Elad et al ., , ; Shapiro et al ., ).…”

Section: Methodsmentioning

confidence: 99%

“…()) has increased significantly. Recently, severe downy mildew epidemics have developed in sweet basil crops and pose a threat to protected crops (Elad et al ., ).…”

Section: Introductionmentioning

confidence: 97%

“…Temperatures in polyethylene‐covered sweet basil greenhouses that were kept closed for 6 h each day reached 42 °C during the winter period and the incidence of BGM in these greenhouses was reduced while basil yields increased (Elad et al ., ). A suppressive effect of this heating on sweet basil downy mildew was recently reported (Elad et al ., ). The quality and shelf life of the cut basil were not reduced by the passive heat treatment (Elad et al ., , ; Shapiro et al ., ).…”

Section: Introductionmentioning

confidence: 97%

“…A suppressive effect of this heating on sweet basil downy mildew was recently reported (Elad et al ., ). The quality and shelf life of the cut basil were not reduced by the passive heat treatment (Elad et al ., , ; Shapiro et al ., ). Similarly, elevated daytime temperatures obtained by closing the side walls of greenhouses can significantly suppress pepper powdery mildew ( Leveillula taurica ; anamorph: Oidiopsis sicula ) and tomato powdery mildew ( Oidium neolycopersici ; Elad et al ., ).…”

Section: Introductionmentioning

confidence: 97%

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Passive heat treatment of sweet basil crops suppresses white mould and grey mould

et al. 2016

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Sweet basil white mould (BWM, Sclerotinia sclerotiorum) and grey mould (BGM, Botrytis cinerea) are important diseases in Israel and other basil-growing regions. The impact of microclimate on BWM and BGM and on plant sensitivity to these diseases was studied. Disease incidence was evaluated in three field experiments, each consisting of 10-12 polyethylene-covered tunnels. BWM and BGM incidences were correlated with air temperature, relative humidity (RH) and soil temperature data. The incidence of BWM was negatively correlated with high (above >25 or >30°C) air temperatures, RH > 50% and RH > 75% and high (>21 or >24°C) soil temperatures. BGM incidence was negatively correlated with high (>25°C) air temperatures and high (>21 or >24°C) soil temperatures, and positively correlated with RH >65% or >75%. Shoots harvested from plants grown in the walk-in tunnels were inoculated with S. sclerotiorum or B. cinerea under controlled conditions. Severity of BWM and BGM on those shoots was negatively correlated with tunnel air temperatures of >25 and >30°C and soil temperatures >18°C. Thus, high temperatures were related to reduced disease incidence and to reduced sensitivity to the pathogens. Experiments involving potted plants revealed that heating only the root zone suppresses canopy susceptibility to BWM and BGM. These findings indicate that the effect of high greenhouse temperatures involves an indirect systemic effect that renders the host less susceptible to disease. This effect was also observed in harvested shoots that were no longer at the high temperatures, and the effect was systemic.

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Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

“…()) has increased significantly. Recently, severe downy mildew epidemics have developed in sweet basil crops and pose a threat to protected crops (Elad et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

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Passive heat treatment of sweet basil crops suppresses white mould and grey mould

et al. 2016

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Challenges and recommendations for the development of cultural control of aerial oomycete-associated diseases in protected horticulture

2023

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Detection of mefenoxam-resistant strains of Peronospora belbahrii, the causal agent of basil downy mildew, transmitted through infected seeds

et al. 2016

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Epidemics of basil downy mildew (DM) incited by Peronospora belbahrii have been very severe in Italy since 2013, in part due to the very favorable weather conditions, and losses have occurred in many commercial farms, even after repeated mefenoxam treatments. DM populations from basil plants and seeds, which are associated with failure in downy mildew control under field and greenhouse conditions, have been tested for their sensitivity to mefenoxam. Basil plants were inoculated with a sporangial suspension of seven DM populations and treated, before and after inoculation with the pathogen, with different dosages of mefenoxam: 100 µg/ml, which corresponds to the currently applied field dosage, 200 µg/ml and 1000 µg/ml. Azoxystrobin was used at the field dosage as the chemical control. Three out of four DM populations from seeds and two out of three from basil plants were found to be able to infect basil plants in the presence of 100 µg/ml and 200 µg/ml of mefenoxam, while the field dosage of azoxystrobin (186 µg/ml) was found to be completely effective. The sensitive populations of P. belbahrii were completely controlled by the field dosage of both chemicals also 14 days after the last treatment. This study provides new information on the potential risk of introducing mefenoxam-resistant P. belbahrii inoculum in the field through seeds infected by resistant strains.

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Passive heat treatment of sweet basil crops suppressesPeronospora belbahriidowny mildew

Cited by 26 publications

References 32 publications

Passive heat treatment of sweet basil crops suppresses white mould and grey mould

Passive heat treatment of sweet basil crops suppresses white mould and grey mould

Challenges and recommendations for the development of cultural control of aerial oomycete-associated diseases in protected horticulture

Detection of mefenoxam-resistant strains of Peronospora belbahrii, the causal agent of basil downy mildew, transmitted through infected seeds

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