Influence of Soil Temperature and Moisture on Survival and Growth of Strands of Phymatotrichum omnivorum

Wheeler, J. E.

doi:10.1094/phyto-62-828

Cited by 8 publications

(3 citation statements)

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“…Later, studies have shown that strands can only survive on live cotton roots (Alderman and Hine, ), and strands on dead cotton roots may survive for a maximum of 9 months at 10–30°C and 12–45% soil moisture (Wheeler and Hine, ). However, type of soil, nutrient sources and other factors may also influence survival of strands (Wheeler and Hine, ). Under favourable conditions, sclerotia can survive up to 12 years in the soil (McNamara et al., ; Streets and Bloss, ).…”

Section: Pest Categorisationmentioning

confidence: 99%

“…Older studies found that even after several years of clean fallow or cultivation of non‐susceptible plants, viable strands were still present in the soil (McNamara et al., ). Later, studies have shown that strands can only survive on live cotton roots (Alderman and Hine, ), and strands on dead cotton roots may survive for a maximum of 9 months at 10–30°C and 12–45% soil moisture (Wheeler and Hine, ). However, type of soil, nutrient sources and other factors may also influence survival of strands (Wheeler and Hine, ).…”

Section: Pest Categorisationmentioning

confidence: 99%

“…The optimal pH for growth and survival is 7.2–8.0 (Percy, ). Wheeler and Hine () found that mycelial strands are formed at soil temperatures between 27°C and 32°C and soil moisture levels of 22–30%. Strand formation was sparse below 16 and above 35°C and absent at 10°C and 40°C.…”

Section: Pest Categorisationmentioning

confidence: 99%

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Pest categorisation of Phymatotrichopsis omnivora

Bragard¹,

Dehnen‐Schmutz²,

Serio³

et al. 2019

EFS2

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The Panel on Plant Health performed a pest categorisation of Phymatotrichopsis omnivora, the causal agent of Phymatotrichum root rot of more than 2,000 dicotyledonous plant species, for the EU. The pest is listed as Trechispora brinkmannii in Annex IAI of Directive 2000/29/EC. P. omnivora is a well‐defined fungal species and reliable methods exist for its detection and identification. It is present in south‐western USA, northern Mexico, Libya and Venezuela. The pest is not known to occur in the EU. P. omnivora has an extremely wide host range; quantitative impacts have been documented for Gossypium spp. (cotton), Medicago sativa (alfalfa), Malus domestica (apple), Prunus persica (peach) and Vitis vinifera (grapevine) as the major cultivated hosts. All major hosts and pathways of entry of the pest into the EU are currently regulated, except for soil and growing media attached or associated with plants originating in Libya. Host availability and climate and edaphic matching suggest that P. omnivora could establish in parts of the EU and further spread mainly by human‐assisted means. The pest infects the roots causing wilting and death of its host plants. The introduction of the pest in the EU territory would potentially cause direct and indirect impacts at least to cotton, alfalfa, apple, peach and grapevine production. The main uncertainties concern the host range, the extrapolation to the EU of the climatic and edaphic conditions favouring the disease in some of the infested areas, the role of conidia in the epidemiology of the disease and the magnitude of potential impacts to the EU. P. omnivora meets all the criteria assessed by EFSA for consideration as potential Union quarantine pest. The criteria for considering P. omnivora as a potential Union regulated non‐quarantine pest are not met, since the pest is not known to occur in the EU.

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Section: Pest Categorisationmentioning

confidence: 99%