Claim · model-written summary
Onion plants of all ages were equally susceptible.
- Taxon
- onion
Allium cepat0 - Organ / stage
- all agese0
- Outcome
- susceptiblee0
- Direction
- equallye0
Not reportedMaterialGeneCompoundInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants of all ages are equally susceptible.”
t0“onion”
Title
J. A. B. Nolla The Journal of Agriculture of the University of Puerto Rico 1926. doi:10.46429/jaupr.v10i3-4.15070
Other claims from this paper (19)
- Observation Onion leaves and bulb scales were affected by anthracnose.
- Observation Market onion was affected by anthracnose.
- Observation A multiplier variety of Allium cepa L. was affected by anthracnose.
- Observation Yellow, red and white onion varieties lacked resistance to anthracnose.
- Observation Tropical onion varieties were as susceptible as temperate-zone types.
- Observation Anthracnose lesions on onion leaves were elliptic or oval spots.
- Observation Young lesions on red onion varieties showed a red stain.
- Observation The onion anthracnose pathogen was described as the new species Colletotrichum Chardonianum.
- Observation The causal fungus grew excellently in carbohydrate media, especially starch-containing media.
- Observation Controlled infection experiments showed that C. Chardonianum produced onion disease.
- Mechanism Onion infection occurred primarily through stomata.
- Mechanism Pathogen germ tubes may penetrate onion cuticle.
- Observation C. Chardonianum conidia germinated in water at 21° C. in 3 1/2 to 4 1/2 hours.
- Observation Conidial germination produced primary, secondary and tertiary appresoria, as well as secondary conidia.
- Observation Temperatures of 18° C. and 33° C. seemed to inhibit pathogen conidial germination.
- Observation Pathogen conidia germinated readily at 25° C.
- Observation The onion pathogen grew best in synthetic culture media at 27° C.
- Observation Onion anthracnose appeared in the field when temperatures were 23° C- 30° C.
- Observation The pathogen apparently survived between seasons as mycelium in soil debris; conidia seemed to resist sulphur fungicides, while copper fungicides were effective in laboratory experiments.