Chemical inducers for resistance induction against powdery mildew of cucumber under greenhouse conditions

Hamza, Amany; Mohamed, Ahmed; Derbalah, Aly

doi:10.1556/038.52.2017.011

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…Enzyme activities were increased by salicylic acid application (Chen et al, 1993). Another study by Hamza et al (2017) indicated that when infected with powdery mildew, biochemical alterations occurring at the cellular stage were observed.…”

Section: Discussionmentioning

confidence: 95%

Integration of bioagents with antioxidants to control Powdery Mildew disease in sunflower

Yousef

2021

Egyptian Journal of Agricultural Research

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Powdery mildew disease, caused by Erysiphe cichoracearum, is considered one of the most severe pathogenic threats of sunflower worldwide. This study discusses how to improve the effect of biocontrol agents, as a more economic and ecofriendlier alternative to fungicides, by mixing different bioagents (Trichoderma harzianum and Bacillus subtilis) with different antioxidants (ascorbic acid and salicylic acid), either individually or combined. They were applied to sunflower during two successive seasons to determine their effectiveness in promoting growth and inducing resistance in sunflower against powdery mildew disease under field conditions. Results show that all treatments reduced the severity of powdery mildew disease significantly compared with control. A synergistic effect was noticed when combining T. harzianum and salicylic acid led to a significant decrease in powdery mildew disease severity in sunflower in comparison to control. In general, the results suggested that the integration of antioxidants with bioagents showed a better response to control powdery mildew disease than single treatments. Applied treatments in the field significantly increased all of the studied growth parameters, plant length, fresh and dry weight. All treatments showed a remarkable increase in physiological aspects (enzymes activity and total phenol content).

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Section: Discussionmentioning

confidence: 95%

Integration of bioagents with antioxidants to control Powdery Mildew disease in sunflower

Yousef

2021

Egyptian Journal of Agricultural Research

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“…Potassium enrichment in cucumber reduced the natural incidence of downy mildew ( Pseudoperonospora cubensis ) [ 39 ]. A reduction in cucumber powdery mildew was achieved through the application of potassium dihydrogen phosphate, magnesium sulfate, ferrous sulfate, and potassium monohydrogen phosphate [ 41 ]. Effective control of cucumber powdery mildew, as expressed by a 99% reduction in symptoms, was achieved one or two days post application of a single spray of phosphate and K salt solutions and those treatments were also effective at a later stage [ 37 , 38 ].…”

Section: Discussionmentioning

confidence: 99%

“…cucumerinum [ 40 ]. Monopotassium phosphate (MKP) is effective against cucumber powdery mildew under commercial conditions [ 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

Nutrient Status of Cucumber Plants Affects Powdery Mildew (Podosphaera xanthii)

Elad

Barnea

Rav‐David

et al. 2021

Plants

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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, Podosphaera xanthii) in potted plants and under commercial-like conditions. Spraying CaCl2 and MgCl2, or KCl and K2SO4, 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 CaCl2 and MgCl2. When sprayed applications of Mg and K salts were analyzed separately from the untreated control, the Cl− salts were found to be more effective than the SO4−2 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 (K2Ca2Mg(SO4)4·2H2O), and the salts mentioned above over an entire growing season suppressed CPM. CPM severity was also reduced by spray applications of Ca, Mg, and KSO4−2 and Cl− salts. Spray applications provided better CPM control than fertigation treatments. Induced resistance is probably involved in the effects of nutrients on CPM.

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“…Seedlings that were grown from the treated seeds demonstrated increased hypersensitive response in reaction to inoculation with S. graminicola [31]. Additionally, Hamza et al [32] reported on KH 2 PO 4 , K 2 HPO 4 , and MgSO 4 as chemical inducers of resistance, among others, sprayed on cucumber plants for the control of PM in a greenhouse. Similarly, Reuveni et al [19,28,29] demonstrated that phosphates and K salts (MKP) were appropriate for use as inducing foliar fertilizers that suppress cucumber PM.…”

Section: Spraying Of Salts Over the Plant's Canopymentioning

confidence: 99%

Effect of Mineral Nutrition and Salt Spray on Cucumber Downy Mildew (Pseudoperonospora cubensis)

Barnea

Yermiyahu

Rav‐David

et al. 2022

Plants

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It was previously shown that spraying with CaCl2, MgCl2, KCl, and K2SO4 and high N and Mg concentrations in the irrigation water of potted cucumber plants reduced powdery mildew, while medium P and high K concentrations increased powdery mildew. In the present work, we tested the effect of irrigation with N, P, K, Ca, and Mg and spraying with salts on downy mildew (Pseudoperonospora cubensis) of cucumber (CDM). In potted plants, an increase in N concentration in the irrigation water resulted in a major increase in CDM severity, while an increase in K or Ca concentrations resulted in a gradual increase in CDM severity. An increase in P and Mg concentrations in the irrigation water resulted in a major CDM decrease. Spraying with Ca, Mg, and K salts with Cl and SO4 anions resulted in CDM suppression in most cases, and a negative correlation was obtained between the salt and anion molar concentrations and the CDM severity. Using NaCl sprays, both Na and Cl concentrations were negatively related to the CDM severity. MgCl2 (0.1 M Cl), K2SO4 (0.1 M SO4), MgCl2 + K2SO4, and monopotassium phosphate (MKP, 1%) sprayed under commercial-like (CL) conditions significantly reduced CDM by 36.6% to 62.6% in one disease cycle, while, in a second cycle, CDM was significantly reduced only by K2SO4 and MKP. In conclusion, fertigation with P and Mg, and salt spraying decreased CDM, while only spraying under CL resulted in CDM suppression.

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Chemical inducers for resistance induction against powdery mildew of cucumber under greenhouse conditions

Cited by 7 publications

References 26 publications

Integration of bioagents with antioxidants to control Powdery Mildew disease in sunflower

Integration of bioagents with antioxidants to control Powdery Mildew disease in sunflower

Nutrient Status of Cucumber Plants Affects Powdery Mildew (Podosphaera xanthii)

Effect of Mineral Nutrition and Salt Spray on Cucumber Downy Mildew (Pseudoperonospora cubensis)

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