Environment-Friendly Control of Cucumber Downy Mildew Using Chlorine Dioxide

Pseudoperonospora cubensis (downy mildew) is highly virulent to various Cucurbitaceae crops, including cucumber (Cucumis sativus). We tested chlorine dioxide application in a plastic greenhouse for environmentfriendly control of downy mildew disease. Spraying diluted chlorine dioxide suppressed downy mildew disease with 41.2% control efficacy. Thermal fogging with chlorine dioxide had a high control efficacy of 80.9%, confirming that this approach is useful for environment-friendly downy mildew control. Using thermal fogging to control diseases that are greatly affected by humidity, such as downy mildew, may be more effective compared with conventional dilution spray control methods.

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From Old-Generation to Next-Generation Nematicides

Agronomy ◽

10.3390/agronomy10091387 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1387

Author(s):

Yuji Oka

Keyword(s):

Control Strategies ◽

Intensive Agriculture ◽

Control Methods ◽

Nematode Control ◽

Next Generation ◽

Control Efficacy ◽

Cash Crops ◽

Low Toxicity ◽

High Control ◽

Soil Fumigants

The phaseout of methyl bromide and the ban on, or withdrawal of, other toxic soil fumigants and non-fumigant nematicides belonging to the organophosphate and carbamate groups are leading to changes in nematode-control strategies. Sustainable nematode-control methods are available and preferred, but not always effective enough, especially for cash crops in intensive agriculture. A few non-fumigant nematicides, which have a relatively high control efficacy with a low toxicity to non-target organisms, have been released to the market or are in the process of being registered for use. Fluensulfone, fluopyram, and fluazaindolizine are the three main and most promising next-generation nematicides. In this paper, several aspects of these non-fumigant nematicides are reviewed, along with a brief history and problems of old-generation nematicides.

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STUDIES ON ONION DOWNY MILDEW DISEASE AND ITS CONTROL METHODS

Menoufia Journal of Plant Protection ◽

10.21608/mjapam.2017.127030 ◽

2017 ◽

Vol 2 (6) ◽

pp. 351-352

Author(s):

M. M. Ammar ◽

G. A. Amer ◽

M. O. Seliem ◽

Dalia A. selim

Keyword(s):

Downy Mildew ◽

Control Methods ◽

Onion Downy Mildew ◽

Downy Mildew Disease

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Ability of Some Antagonistic Fungi for Controlling Cucumber Downy Mildew Disease Caused by Pseudoperonospora cubensis

Journal of Plant Protection and Pathology ◽

10.21608/jppp.2021.57331.1009 ◽

2021 ◽

Vol 12 (1) ◽

pp. 67-69

Author(s):

Mina Shoukry ◽

T. Al Gazar ◽

M. EL-Sheshtawi

Keyword(s):

Downy Mildew ◽

Pseudoperonospora Cubensis ◽

Antagonistic Fungi ◽

Cucumber Downy Mildew ◽

Downy Mildew Disease

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Polyethylene Mulch Modifies Greenhouse Microclimate and Reduces Infection of Phytophthora infestans in Tomato and Pseudoperonospora cubensis in Cucumber

Phytopathology ◽

10.1094/phyto-100-1-0097 ◽

2010 ◽

Vol 100 (1) ◽

pp. 97-104 ◽

Cited By ~ 24

Author(s):

D. Shtienberg ◽

Y. Elad ◽

M. Bornstein ◽

G. Ziv ◽

A. Grava ◽

...

Keyword(s):

Late Blight ◽

Phytophthora Infestans ◽

Downy Mildew ◽

Pseudoperonospora Cubensis ◽

Control Efficacy ◽

Cucumber Downy Mildew ◽

To Come ◽

The Individual ◽

Substantial Control ◽

Polyethylene Mulch

The individual and joint effects of covering the soil with polyethylene mulch before planting and fungicides commonly used by organic growers on tomato late blight (caused by Phytophthora infestans) were studied in three experiments conducted from 2002 to 2005. Application of fungicides resulted in inconsistent and insufficient late blight suppression (control efficacy ± standard error of 34.5 ± 14.3%) but the polyethylene mulch resulted in consistent, effective, and highly significant suppression (control efficacy of 83.6 ± 5.5%) of the disease. The combined effect of the two measures was additive. In a second set of three experiments carried out between 2004 and 2006, it was found that the type of polyethylene mulch used (bicolor aluminized, clear, or black) did not affect the efficacy of late blight suppression (control efficacy of 60.1 to 95.8%) and the differences in the effects among the different polyethylene mulches used were insignificant. Next, the ability of the mulch to suppress cucumber downy mildew (caused by Pseudoperonospora cubensis) was studied in four experiments carried out between 2006 and 2008. The mulch effectively suppressed cucumber downy mildew but the effect was less substantial (control efficacy of 34.9 ± 4.8%) than that achieved for tomato late blight. The disease-suppressing effect of mulch appeared to come from a reduction in leaf wetness duration, because mulching led to reductions in both the frequency of nights when dew formed and the number of dew hours per night when it formed. Mulching also reduced relative humidity in the canopy, which may have reduced sporulation.

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EVALUATION OF THE NANOSILVER COLLOIDAL SOLUTION IN COMPARISON WITH THE REGISTERED FUNGICIDE TO CONTROL GREENHOUSE CUCUMBER DOWNY MILDEW DISEASE IN THE NORTH OF IRAN

Acta Horticulturae ◽

10.17660/actahortic.2010.877.226 ◽

2010 ◽

pp. 1643-1646 ◽

Cited By ~ 2

Author(s):

S.V. Alavi ◽

A.A. Dehpour

Keyword(s):

Downy Mildew ◽

Colloidal Solution ◽

The North ◽

Cucumber Downy Mildew ◽

North Of Iran ◽

Greenhouse Cucumber ◽

Downy Mildew Disease

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Investigation of different leaf characters on Muskmelon cultivars possessing grades of resistance to downy mildew disease

International Journal of Pharma and Bio Sciences ◽

10.22376/ijpbs.2017.8.3.b1129-1140 ◽

2017 ◽

Vol 8 (3) ◽

Author(s):

M. MAHA JAN ◽

M. DHIL LON ◽

K BHARD WAJ

Keyword(s):

Downy Mildew ◽

Downy Mildew Disease

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Co-Occurrence of Two Phylogenetic Clades of Pseudoperonospora cubensis, the Causal Agent of Downy Mildew Disease, on Oriental Pickling Melon

Mycobiology ◽

10.1080/12298093.2021.1880310 ◽

2021 ◽

pp. 1-8

Author(s):

Dong Jae Lee ◽

Jae Sung Lee ◽

Young-Joon Choi

Keyword(s):

Downy Mildew ◽

Causal Agent ◽

Pseudoperonospora Cubensis ◽

Downy Mildew Disease

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Updated Characterization of Races of Plasmopara halstedii and Entomopathogenic Fungi as Endophytes of Sunflower Plants in Axenic Culture

Agronomy ◽

10.3390/agronomy11020268 ◽

2021 ◽

Vol 11 (2) ◽

pp. 268

Author(s):

Pedro Miranda-Fuentes ◽

Ana B. García-Carneros ◽

Leire Molinero-Ruiz

Keyword(s):

Plant Growth ◽

Downy Mildew ◽

Entomopathogenic Fungi ◽

Genetic Resistance ◽

Axenic Culture ◽

Plasmopara Halstedii ◽

Successful Establishment ◽

Axenic Conditions ◽

Highly Virulent

The management of downy mildew (Plasmopara halstedii) in sunflower, is heavily dependent on genetic resistance, whilst entomopathogenic fungi (EF) can reduce other sunflower diseases. In this work, we characterized P. halstedii from Spain and other countries collected in the past few years. Twenty-three races were identified (the most frequent in Spain being 310, 304, 705 and 715), with an increasing proportion of highly virulent races. Five isolates from countries other than Spain overcame the resistance in RHA-340. In addition, we assessed the efficacy of five EF against downy mildew and their effects on sunflower growth in axenic conditions. None of the entomopathogens reduced disease severity, nor did they have any effect on plant growth when applied together with P. halstedii. In contrast, three EF reduced some of the plant growth variables in the absence of the pathogen. Microbiological and molecular diagnostics suggest that the axenic system and the short experimental time used in this study did not favor the successful establishment of EF in the plants or their potential biocontrol effect. Our results show a shift in P. halstedii racial patterns and suggest that soil as a growth substrate and long infection times are needed for EF effectiveness against downy mildew.

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