Abstract
SUMMARY The systemic fungicides dimethirimol and ethirimol were shown to be toxic to spores of Erysiphe graminis and Sphaerotheca fuliginea, in germination tests in vitro. Toxicity of dimethirimol to spores of Botrytis fabae, Phytophthora infestans, Puccinia recondita, Uncinula necator and Venturia inaequalis was relatively feeble or absent. When applied in foliage sprays or in root treatments, both compounds inhibited the emergence of germ tubes from powdery mildew spores on cucumber and barley plants. The specific disease control shown by these fungicides can be explained by their direct fungitoxic action. The effects of dimethirimol and ethirimol on powdery mildew infections and on spore germination were greatly decreased by the presence of riboflavin in the light. A rapid photo‐chemical interaction between riboflavin and dimethirimol was demonstrated. Marked reversals both of disease control and of fungitoxicity were also given by folic acid, and it is suggested that folic acid overcomes a metabolic block induced in powdery mildew fungi by the fungicides.
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Claims 4
Claim · model-written summary
Dimethirimol and ethirimol inhibited powdery mildew spore germ tube emergence on cucumber and barley plants after foliar or root application.
- Taxon
- cucumber and barley
Cucumis sativus.jpg?width=60)
Hordeum vulgaree0 - Treatment
- foliage sprays or in root treatmentse0
- Interactor
- powdery mildewe0pathogen
- Outcome
- emergence of germ tubes from powdery mildew sporese0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“When applied in foliage sprays or in root treatments, both compounds inhibited the emergence of germ tubes from powdery mildew spores on cucumber and barley plants.”
Claim · model-written summary
Riboflavin in light greatly reduced the effects of both fungicides on powdery mildew infections.
- Taxon
- cucumber and barleyCucumis sativusHordeum vulgaret0
- Treatment
- riboflavin in the lighte0
- Interactor
- powdery mildewe0pathogen
- Outcome
- effects of dimethirimol and ethirimol on powdery mildew infectionse0
- Direction
- greatly decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of dimethirimol and ethirimol on powdery mildew infections and on spore germination were greatly decreased by the presence of riboflavin in the light.”
t0“on cucumber and barley plants”
Claim · model-written summary
Folic acid markedly reversed disease control by the fungicides.
- Taxon
- cucumber and barleyCucumis sativusHordeum vulgaret0
- Treatment
- folic acide0
- Outcome
- disease controle0
- Direction
- reversalse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Marked reversals both of disease control and of fungitoxicity were also given by folic acid”
t0“on cucumber and barley plants”
Claim · model-written summary
The authors attribute disease control to direct fungitoxic action.
- Taxon
- cucumber and barleyCucumis sativusHordeum vulgaret0
- Outcome
- disease controle0
- Qualifier
- direct fungitoxic actione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The specific disease control shown by these fungicides can be explained by their direct fungitoxic action.”
t0“on cucumber and barley plants”
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