Nutrient Status of Cucumber Plants Affects Powdery Mildew (<i>Podosphaera xanthii</i>)
We examined the effects of applications of N, P, K, Mg, and Ca through an irrigation solution and spraying K, Ca, and Mg salts on cucumber powdery mildew (CPM, <i>Podosphaera xanthii</i>) in potted plants and under commercial-like conditions. Spraying CaCl<sub>2</sub> and MgC...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-10-01
|
| Series: | Plants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2223-7747/10/10/2216 |
| _version_ | 1797513386051764224 |
|---|---|
| author | Yigal Elad Dor Barnea Dalia Rav-David Uri Yermiyahu |
| author_facet | Yigal Elad Dor Barnea Dalia Rav-David Uri Yermiyahu |
| author_sort | Yigal Elad |
| collection | DOAJ |
| description | We examined the effects of applications of N, P, K, Mg, and Ca through an irrigation solution and spraying K, Ca, and Mg salts on cucumber powdery mildew (CPM, <i>Podosphaera xanthii</i>) in potted plants and under commercial-like conditions. Spraying CaCl<sub>2</sub> and MgCl<sub>2</sub>, or KCl and K<sub>2</sub>SO<sub>4</sub>, decreased CPM. There were significant negative correlations between the anion-related molar concentrations of the salts and disease severity. Among the sprayed treatments, NaCl provided significantly less CPM control when applied at a low (0.05 M) concentration, as compared with CaCl<sub>2</sub> and MgCl<sub>2</sub>. When sprayed applications of Mg and K salts were analyzed separately from the untreated control, the Cl<sup>−</sup> salts were found to be more effective than the SO<sub>4</sub><sup>−2</sup> salts. High N and Mg concentrations in the irrigation water delivered to young, fruit-less cucumber plants reduced CPM, whereas more CPM was observed when the irrigation solution contained a medium amount of P and a high amount of K. In contrast, mature, fruit-bearing plants had less severe CPM at higher N, lower P, and higher K levels. Spraying mature plants with monopotassium phosphate, polyhalite (K<sub>2</sub>Ca<sub>2</sub>Mg(SO<sub>4</sub>)<sub>4</sub>·2H<sub>2</sub>O), and the salts mentioned above over an entire growing season suppressed CPM. CPM severity was also reduced by spray applications of Ca, Mg, and KSO<sub>4</sub><sup>−2</sup> and Cl<sup>−</sup> salts. Spray applications provided better CPM control than fertigation treatments. Induced resistance is probably involved in the effects of nutrients on CPM. |
| first_indexed | 2024-03-10T06:15:51Z |
| format | Article |
| id | doaj.art-ff44f41e8bf74896b19f6b829b4cb110 |
| institution | Directory Open Access Journal |
| issn | 2223-7747 |
| language | English |
| last_indexed | 2024-03-10T06:15:51Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Plants |
| spelling | doaj.art-ff44f41e8bf74896b19f6b829b4cb1102023-11-22T19:45:44ZengMDPI AGPlants2223-77472021-10-011010221610.3390/plants10102216Nutrient Status of Cucumber Plants Affects Powdery Mildew (<i>Podosphaera xanthii</i>)Yigal Elad0Dor Barnea1Dalia Rav-David2Uri Yermiyahu3Department Plant Pathology and Weed Research, Agricultural Research Organization, The Volcani Center, 68 Hamakabim Rd, Rishon LeZion 7534509, IsraelDepartment Plant Pathology and Weed Research, Agricultural Research Organization, The Volcani Center, 68 Hamakabim Rd, Rishon LeZion 7534509, IsraelDepartment Plant Pathology and Weed Research, Agricultural Research Organization, The Volcani Center, 68 Hamakabim Rd, Rishon LeZion 7534509, IsraelAgricultural Research Organization, Gilat Research Center, D.N. Negev 2, Bet Dagan 85280, IsraelWe examined the effects of applications of N, P, K, Mg, and Ca through an irrigation solution and spraying K, Ca, and Mg salts on cucumber powdery mildew (CPM, <i>Podosphaera xanthii</i>) in potted plants and under commercial-like conditions. Spraying CaCl<sub>2</sub> and MgCl<sub>2</sub>, or KCl and K<sub>2</sub>SO<sub>4</sub>, decreased CPM. There were significant negative correlations between the anion-related molar concentrations of the salts and disease severity. Among the sprayed treatments, NaCl provided significantly less CPM control when applied at a low (0.05 M) concentration, as compared with CaCl<sub>2</sub> and MgCl<sub>2</sub>. When sprayed applications of Mg and K salts were analyzed separately from the untreated control, the Cl<sup>−</sup> salts were found to be more effective than the SO<sub>4</sub><sup>−2</sup> salts. High N and Mg concentrations in the irrigation water delivered to young, fruit-less cucumber plants reduced CPM, whereas more CPM was observed when the irrigation solution contained a medium amount of P and a high amount of K. In contrast, mature, fruit-bearing plants had less severe CPM at higher N, lower P, and higher K levels. Spraying mature plants with monopotassium phosphate, polyhalite (K<sub>2</sub>Ca<sub>2</sub>Mg(SO<sub>4</sub>)<sub>4</sub>·2H<sub>2</sub>O), and the salts mentioned above over an entire growing season suppressed CPM. CPM severity was also reduced by spray applications of Ca, Mg, and KSO<sub>4</sub><sup>−2</sup> and Cl<sup>−</sup> salts. Spray applications provided better CPM control than fertigation treatments. Induced resistance is probably involved in the effects of nutrients on CPM.https://www.mdpi.com/2223-7747/10/10/2216agrotechnical controlcalcium<i>Cucumis sativus</i>cultural controlintegrated managementpowdery mildew |
| spellingShingle | Yigal Elad Dor Barnea Dalia Rav-David Uri Yermiyahu Nutrient Status of Cucumber Plants Affects Powdery Mildew (<i>Podosphaera xanthii</i>) Plants agrotechnical control calcium <i>Cucumis sativus</i> cultural control integrated management powdery mildew |
| title | Nutrient Status of Cucumber Plants Affects Powdery Mildew (<i>Podosphaera xanthii</i>) |
| title_full | Nutrient Status of Cucumber Plants Affects Powdery Mildew (<i>Podosphaera xanthii</i>) |
| title_fullStr | Nutrient Status of Cucumber Plants Affects Powdery Mildew (<i>Podosphaera xanthii</i>) |
| title_full_unstemmed | Nutrient Status of Cucumber Plants Affects Powdery Mildew (<i>Podosphaera xanthii</i>) |
| title_short | Nutrient Status of Cucumber Plants Affects Powdery Mildew (<i>Podosphaera xanthii</i>) |
| title_sort | nutrient status of cucumber plants affects powdery mildew i podosphaera xanthii i |
| topic | agrotechnical control calcium <i>Cucumis sativus</i> cultural control integrated management powdery mildew |
| url | https://www.mdpi.com/2223-7747/10/10/2216 |
| work_keys_str_mv | AT yigalelad nutrientstatusofcucumberplantsaffectspowderymildewipodosphaeraxanthiii AT dorbarnea nutrientstatusofcucumberplantsaffectspowderymildewipodosphaeraxanthiii AT daliaravdavid nutrientstatusofcucumberplantsaffectspowderymildewipodosphaeraxanthiii AT uriyermiyahu nutrientstatusofcucumberplantsaffectspowderymildewipodosphaeraxanthiii |