Effect of Mineral Nutrition and Salt Spray on Cucumber Downy Mildew (Pseudoperonospora cubensis)
Abstract
:1. Introduction
2. Results
2.1. Pot Experiments—Relationship between the Concentrations of Supplemental Nutrients in the Fertigation Solution and CDM Severity
2.1.1. Relationship between N, P, and K Nutrition through the Fertigation Solution with CDM Severity
2.1.2. Relationship between Ca and Mg Nutrition through the Fertigation Solution with CDM Severity
2.2. Spray of Salts for the Control of CDM
2.2.1. Spray Application of Salts for CDM Suppression (Expt. A-s1)
2.2.2. Effect of NaCl Spray on CDM (Expt. B-s1)
2.2.3. Effect of Na and Cl Concentrations in the Leaves on CDM Severity (Expt. B-s2)
2.2.4. Effect of the Spray of Cl and SO4 Salt Solutions on CDM of Cucumber Plants Grown in Pots (Expts B-s3)
2.3. Semi-Commercial Experiments to Test the Effects of Spray Applications of Various Salts on CDM (Expts B-SCs-a/b)
2.4. Effect of Spray Treatments on CDM under Commercial-Like Conditions
3. Discussion
3.1. Application of Nutritional Elements in the Irrigation Water
3.2. Spraying of Salts over the Plant’s Canopy
4. Materials and Methods
4.1. General
4.2. Effects of Different Concentrations of N, P, K, Ca, and Mg in the Fertigation Solution on CDM (Expts B-#-f)
4.3. Foliar Application of Salt Solutions to Potted Cucumber Plants (Expts A-s 1 and B-s 1 to 3)
4.4. Foliar Application of Salt Solutions to Cucumber Plants Grown under Semi-Commercial Conditions (Expts A-SCs a and b)
4.5. Commercial-Like Net House Experiments (CL) to Test Fertigation through Irrigation and Spray
4.6. Pathogen and Disease
4.7. Element Analysis
4.8. Statistics
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Site | Code | Growing Setting | Elements Tested | Application | Season |
---|---|---|---|---|---|
B | B-N-f | Pots | N | Fertigation (f) | All year |
B | B-P-f | Pots | P | Fertigation | All year |
B | B-K-f | Pots | K | Fertigation | All year |
B | B-Ca-f | Pots | Ca (Cl) | Fertigation | All year |
B | B-Mg-f | Pots | Mg (Cl) | Fertigation | All year |
A | A-s1 | Pots | K2SO4, KCl, MgCl2, CaCl2 | Foliar (spray, “s”) | All year |
B | B-s1 | Pots | NaCl | Foliar | All year |
B | B-s2 | Pots | NaCl | Foliar | All year |
B | B-s3 | Pots | MgSO4, MgCl2, K2SO4, KCl, NaCl | Foliar | All year |
A | A-SCs-a | Large pots (semi-commercial) | MgCl2, CaCl2, K2SO4, MgCl2 + CaCl2 + K2SO4 | Foliar | Autumn–Winter |
A | A-SCs-b | Large pots (semi-commercial) | Monopotassium phosphate (MKP), K2Ca2Mg(SO4)4·2(H2O) (polyhalite as polysulfate) | Foliar | Winter–Spring |
C | CL1 | Boxes (commercial-like) | MgCl2 + K2SO4 | Fertigation and foliar | Spring |
C | CL2 | Boxes (commercial-like) | MgCl2, K2SO4, MgCl2 + K2SO4, MKP | Foliar | Spring |
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Barnea, D.; Yermiyahu, U.; Rav-David, D.; Elad, Y. Effect of Mineral Nutrition and Salt Spray on Cucumber Downy Mildew (Pseudoperonospora cubensis). Plants 2022, 11, 1007. https://doi.org/10.3390/plants11081007
Barnea D, Yermiyahu U, Rav-David D, Elad Y. Effect of Mineral Nutrition and Salt Spray on Cucumber Downy Mildew (Pseudoperonospora cubensis). Plants. 2022; 11(8):1007. https://doi.org/10.3390/plants11081007
Chicago/Turabian StyleBarnea, Dor, Uri Yermiyahu, Dalia Rav-David, and Yigal Elad. 2022. "Effect of Mineral Nutrition and Salt Spray on Cucumber Downy Mildew (Pseudoperonospora cubensis)" Plants 11, no. 8: 1007. https://doi.org/10.3390/plants11081007