Impact of summer flooding on viability of Sclerotinia minor and S. sclerotiorum sclerotia in soil

Michael E Matheron, Martin Porchas

Research output: Contribution to journalArticle

Abstract

Lettuce drop, caused by the soilborne fungi Sclerotinia minor and S. sclerotiorum, is an important and destructive disease of lettuce. Research trials in Arizona have shown that some fungicides, such as boscalid and iprodione, can reduce disease incidence up to 50 to 60%. Prior research also demonstrated that viability of S. minor and S. sclerotiorum sclerotia was completely arrested after subjection to a respective 2- and 3-week period of continuous flooding in soil during the summer. Widespread adoption of this cultural disease management tool led to concerns in southwestern Arizona about misuse of a precious resource in an arid environment, damage to drainage canals from excessive ground water, and rising water tables adversely affecting lettuce growth. Overall data from current studies, which compared reduction of sclerotia viability after continuous flooding to less intensive flooding of one 8-h period for 1 to 3 weeks or two 8-h periods for 3 weeks, revealed that continuous flooding was not better than 8-h flooding periods for sclerotia of S. minor but was superior for sclerotia of S. sclerotiorum. Because Arizona lettuce growers have to contend with both species of Sclerotinia, continuous flooding is still the best flooding alternative to achieve virtual elimination of viable sclerotia of both pathogens.

Original languageEnglish (US)
Pages (from-to)15-18
Number of pages4
JournalPlant Health Progress
Volume19
Issue number1
DOIs
StatePublished - Jan 1 2018

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Sclerotinia minor
sclerotia
Sclerotinia sclerotiorum
lettuce
viability
summer
soil
boscalid
iprodione
Sclerotinia
drainage channels
dry environmental conditions
disease incidence
water table
fungicides
growers
disease control
groundwater
fungi
pathogens

ASJC Scopus subject areas

  • Plant Science
  • Horticulture

Cite this

Impact of summer flooding on viability of Sclerotinia minor and S. sclerotiorum sclerotia in soil. / Matheron, Michael E; Porchas, Martin.

In: Plant Health Progress, Vol. 19, No. 1, 01.01.2018, p. 15-18.

Research output: Contribution to journalArticle

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