Control of potato powdery scab caused by Spongospora subterranea by foliage cover and soil application of chemicals under field conditions with naturally infested soil

2020 ◽  
Vol 69 (6) ◽  
pp. 1070-1082 ◽  
Author(s):  
Leah Tsror (Lahkim) ◽  
Sara Lebiush ◽  
Marina Hazanovsky ◽  
Orly Erlich
Keyword(s):  
Field Conditions ◽  
Powdery Scab ◽  
Infested Soil ◽  
Spongospora Subterranea ◽  
Soil Application

Effects of irrigation regimes on powdery scab disease and yield of potatoes

1986 ◽  
Vol 26 (6) ◽  
pp. 745 ◽  
Author(s):  
PA Taylor ◽  
SP Flett ◽  
RFde Boer ◽  
D Marshall
Keyword(s):  
Large Scale ◽  
Field Experiments ◽  
Field Trials ◽  
Powdery Scab ◽  
Infested Soil ◽  
Spongospora Subterranea ◽  
Potato Tubers ◽  
Potato Plants ◽  
Tuber Set ◽  
Large Scale Field

The period of susceptibility of potato tubers to powdery scab (Spongospora subterranea) was studied by inoculating potato plants with spores, or by watering plants in infested soil, at different stages of plant development in greenhouse conditions. Maximum susceptibility began about 1 week before the stage when 50% of stolons had swollen to at least 5-mm diameter (tuber set), and ended 3-4 weeks later. With holding irrigation water during this period reduced the severity of powdery scab by 65-75% in field experiments in 1981-82 and 1982-83, but had no apparent effect on disease severity in 3 out of 6 large-scale field trials during 1984-85.

Resistance of potato to powdery scab (Spongospora subterranea) under andean field conditions

1995 ◽  
Vol 72 (6) ◽  
pp. 355-363 ◽  
Author(s):  
H. Torres ◽  
M. A. Pacheco ◽  
E. R. French
Keyword(s):  
Field Conditions ◽  
Powdery Scab ◽  
Spongospora Subterranea

scholarly journals Effect of Soil Application of AG3 Phosphonate on the Severity of Clubroot of Bok Choy and Cabbage Caused by Plasmodiophora brassicae

Plant Disease ◽  
2006 ◽  
Vol 90 (12) ◽  
pp. 1517-1522 ◽  
Author(s):  
P. A. Abbasi ◽  
G. Lazarovits
Keyword(s):  
Disease Severity ◽  
Brassica Rapa ◽  
Plasmodiophora Brassicae ◽  
Field Trials ◽  
Field Conditions ◽  
Infested Soil ◽  
Fresh Weight ◽  
Soil Application ◽  
Muck Soil

Field trials were carried out to test the effect of phosphonate fungicide (AG3) on the severity of clubroot of bok choy (Brassica rapa var. chinensis) and cabbage (B. rapa var. perkinensis and B. oleracea var. capitata) in commercial Ontario muck fields with a clubroot history. Disease severity also was examined in the same infested soil under greenhouse and microplot conditions. In microplot trials with bok choy, AG3 phosphonate concentrations of 0.07 and 0.14% a.i. applied before or after planting consistently reduced clubroot severity (1-to-4 rating) by 0.8 to 1.6 when planted in May or June. However, only the 0.14% a.i. preplanting treatment was effective in trials in July and August. Postplanting drenches of 0.14% a.i. were consistently effective throughout the season. Fresh weight of bok choy was increased or not affected by phosphonate treatments. Under field conditions, one (0.07, 0.14, and 0.21% a.i.) or two (0.07% a.i.) postplant-ing drench applications of phosphonate significantly reduced the incidence of clubroot by 52 to 87% and severity by 1.7 to 2.5 on bok choy in 2004 but not in 2005. In the 2004 trial, two applications of 0.07% a.i. AG3 phosphonate reduced the severity of clubroot comparably to single applications at 0.14 and 0.21% a.i. rates. Fresh weight of bok choy was increased by 34 to 86% with all phosphonate drench treatments in both years. With cabbage, AG3 postplanting drench treatments consistently reduced the severity of clubroot (1-to-5 rating) by a range of 0.7 to 3.3 under greenhouse, microplot, and field conditions. In the greenhouse, a single drench application of 0.07 and 0.14% a.i. AG3 phosphonate 1 day after transplanting cabbage seedlings to the infested muck soil reduced clubroot severity by 2.6 to 3.3 and increased fresh weight of cabbage tops by 66 to 69%. Similar results were seen with cabbage trials under both microplot and field conditions at all AG3 postplanting drench concentrations.

scholarly journals Evaluation of Effects of Chemical Soil Treatments and Potato Cultivars on Spongospora subterranea Soil Inoculum and Incidence of Powdery Scab and Potato Mop-Top Virus in Potato

Plant Disease ◽  
2020 ◽  
Vol 104 (11) ◽  
pp. 2807-2816
Author(s):  
Yuan Zeng ◽  
Ana Cristina Fulladolsa ◽  
Andrew M. Cordova ◽  
Patrick O’Neill ◽  
Stewart M. Gray ◽  
...  
Keyword(s):  
Field Experiments ◽  
Potato Cultivar ◽  
Potato Cultivars ◽  
Powdery Scab ◽  
Infested Soil ◽  
Spongospora Subterranea ◽  
Pathogen Population ◽  
Chemical Treatments ◽  
Soil Inoculum ◽  
Potato Mop Top Virus

Spongospora subterranea is a soilborne plasmodiophorid that causes powdery scab in potato. It also transmits potato mop-top virus (PMTV), which causes necrotic arcs (spraing) in potato tubers. Three field experiments were conducted in naturally S. subterranea-infested soil to investigate the effects of two chemicals, Omega 500F (fluazinam) and FOLI-R-PLUS RIDEZ (biological extract), on powdery scab, PMTV, and changes in S. subterranea inoculum with six different potato cultivars. The efficacy of soil treatment with these two chemicals on tuber lesions, root galling, and pathogen population was also assessed in greenhouse trials. The chemical treatments did not reduce powdery scab, root gall formation, or S. subterranea inoculum in the field or greenhouse trials. Postharvest S. subterranea soil inoculum in fields varied across farms and among potato cultivars but the pathogen population consistently increased by the end of the growing season. The evaluated russet cultivars were more tolerant to powdery scab than the yellow- or red-skinned cultivars but all were susceptible to PMTV. In the field, powdery scab indices and soil inoculum changes were positively correlated, while postharvest S. subterranea inoculum was positively correlated with root galling in both greenhouse trials. Powdery scab and PMTV occurred in noninoculated potting mix, indicating that peat-based potting mix is a source for both pathogens. These results demonstrate that chemical management methods currently used by farmers are ineffective, that S. subterranea and PMTV in potting mix can cause severe epidemics in greenhouses, and that potato cultivar choices impact inoculum increases in soil.

Control of potato powdery scab (Spongospora subterranea) in Israel with chloropicrin, metam sodium or fluazinam

2019 ◽  
Vol 124 ◽  
pp. 104836 ◽  
Author(s):  
L. Tsror (Lahkim) ◽  
O. Erlich ◽  
M. Hazanovsky ◽  
S. Lebiush
Keyword(s):  
Powdery Scab ◽  
Spongospora Subterranea ◽  
Metam Sodium

Field Evaluation of Potato Genotypes for Resistance to Powdery Scab on Tubers and Root Gall Formation Caused by Spongospora subterranea

2016 ◽  
Vol 93 (5) ◽  
pp. 497-508 ◽  
Author(s):  
Francisco G. Bittara ◽  
Asunta L. Thompson ◽  
Neil C. Gudmestad ◽  
Gary A. Secor
Keyword(s):  
Field Evaluation ◽  
Powdery Scab ◽  
Spongospora Subterranea ◽  
Gall Formation

A Greenhouse Assay for Powdery Scab (Spongospora subterranea f. sp. subterranea) Resistance in Potato

2008 ◽  
Vol 51 (2) ◽  
pp. 163-173 ◽  
Author(s):  
S. J. Baldwin ◽  
R. A. Genet ◽  
R. C. Butler ◽  
J. M. E. Jacobs
Keyword(s):  
Powdery Scab ◽  
Spongospora Subterranea ◽  
Greenhouse Assay

scholarly journals Occurrence of Potato Powdery Scab Caused by Spongospora subterranea in Korea

2003 ◽  
Vol 19 (6) ◽  
pp. 284-287 ◽  
Author(s):  
Jeom-Soon Kim ◽  
Kyoung-Yul Ryu ◽  
Jong-Tae Kim ◽  
Young-Gue Lee ◽  
Jeong-Uk Cheon
Keyword(s):  
Powdery Scab ◽  
Spongospora Subterranea

Hairy Nightshade is an Alternative Host of Spongospora subterranea, the Potato Powdery Scab Pathogen

2009 ◽  
Vol 86 (4) ◽  
pp. 297-303 ◽  
Author(s):  
Nadav Nitzan ◽  
Rick Boydston ◽  
Dallas Batchelor ◽  
Jim Crosslin ◽  
Launa Hamlin ◽  
...  
Keyword(s):  
Powdery Scab ◽  
Alternative Host ◽  
Spongospora Subterranea ◽  
Hairy Nightshade

scholarly journals Effect of soil inoculum level and environmental factors on potato powdery scab caused by Spongospora subterranea

2005 ◽  
Vol 54 (1) ◽  
pp. 22-28 ◽  
Author(s):  
P. van de Graaf ◽  
A. K. Lees ◽  
S. J. Wale ◽  
J. M. Duncan
Keyword(s):  
Environmental Factors ◽  
Powdery Scab ◽  
Spongospora Subterranea ◽  
Inoculum Level ◽  
Soil Inoculum
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