Abstract
Rhubarb leaf and petiole spot disease, caused by Ramularia rhei and Ascochyta rhei , has gradually become more noticeable in the UK field crop. Conidial germination and subsequent colony growth of R. rhei and A. rhei were investigated under in vitro conditions on potato dextrose agar and in vivo on leaf discs. Results indicated that the two fungi responded differently to temperature. Ramularia rhei was better adapted to temperatures ≤ 25°C, with an optimum around 20°C, whereas A. rhei was more adapted to temperatures ≥ 15°C, with an optimum > 25°C. Overall, conidia of R. rhei germinated and subsequent colonies grew at greater rates than those of A. rhei on leaf discs at temperatures ≤ 25°C. These results indicated that it is important to identify the causal agent of leaf and petiole spot diseases in rhubarb field crops in order to estimate disease risks accurately.
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Claims 5
Claim · model-written summary
Ramularia rhei was better adapted to temperatures at or below 25°C, with an optimum around 20°C.
- Taxon
- rhubarb
Rheum rhabarbarumt0 - Interactor
- Ramularia rheie0pathogen
- Outcome
- Ramularia rhei was better adaptede0
- Qualifier
- temperatures ≤ 25°C, with an optimum around 20°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ramularia rhei was better adapted to temperatures ≤ 25°C, with an optimum around 20°C”
t0“rhubarb”
Claim · model-written summary
Ascochyta rhei was more adapted to temperatures at or above 15°C, with an optimum above 25°C.
- Taxon
- rhubarbRheum rhabarbarumt0
- Interactor
- A. rheiDidymella rheie0pathogen
- Outcome
- A. rhei was more adaptede0
- Qualifier
- temperatures ≥ 15°C, with an optimum > 25°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. rhei was more adapted to temperatures ≥ 15°C, with an optimum > 25°C.”
t0“rhubarb”
Claim · model-written summary
R. rhei conidia germinated faster than A. rhei conidia on leaf discs at temperatures at or below 25°C.
- Taxon
- rhubarbRheum rhabarbarumt0
- Organ / stage
- leaf discse0
- Interactor
- R. rheie0pathogen
- Second interactor
- A. rheiDidymella rheie0pathogen
- Outcome
- conidia of R. rhei germinatede0
- Direction
- greater ratese0
- Qualifier
- temperatures ≤ 25°Ce0
- Comparator
- A. rheie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conidia of R. rhei germinated and subsequent colonies grew at greater rates than those of A. rhei on leaf discs at temperatures ≤ 25°C.”
t0“rhubarb”
Claim · model-written summary
R. rhei colonies grew faster than A. rhei colonies on leaf discs at temperatures at or below 25°C.
- Taxon
- rhubarbRheum rhabarbarumt0
- Organ / stage
- leaf discse0
- Interactor
- R. rheie0pathogen
- Second interactor
- A. rheiDidymella rheie0pathogen
- Outcome
- R. rhei germinated and subsequent colonies grewe0
- Direction
- greater ratese0
- Qualifier
- temperatures ≤ 25°Ce0
- Comparator
- A. rheie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conidia of R. rhei germinated and subsequent colonies grew at greater rates than those of A. rhei on leaf discs at temperatures ≤ 25°C.”
t0“rhubarb”
Claim · model-written summary
The authors recommend identifying the causal agent to estimate rhubarb spot disease risk accurately.
- Taxon
- rhubarbRheum rhabarbarume0
- Outcome
- identify the causal agent of leaf and petiole spot diseasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it is important to identify the causal agent of leaf and petiole spot diseases in rhubarb field crops in order to estimate disease risks accurately.”