Claim · model-written summary
Trees injured by high water table gradually recovered after the water table was lowered.
CitrusNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the trees gradually recovered”
t0“CITRUS”
Title
ETIOLOGICAL STUDIES OF YELLOW SHOOT OF CITRUS
Lin Kang Acta Phytopathologica Sinica 1956
Other claims from this paper (19)
- Observation Yellow shoot occurred across lowland and highland Citrus sites.
- Association The study found no direct relationship between water injury and yellow shoot development.
- Observation Experimental Citrus roots were generally well above the soil water table.
- Intervention effect At the shallowest water table, the first group of nursery trees developed serious water injury with symptoms distinct from yellow shoot.
- Observation Microscopy found 34 nematodes on 8 rotted rootlets from 5 affected Citrus trees.
- Observation The remaining examined rootlets of diseased trees were free from nematodes.
- Mechanism The authors concluded that nematodes do not cause yellow shoot.
- Intervention effect Soil inoculation with Fusarium pure cultures caused no infection symptoms after two years.
- Intervention effect Inoculation with chopped rotted roots also gave negative results.
- Intervention effect Direct rootlet contact with Fusarium cultures affected 2 of 14 trees, but symptoms differed from yellow shoot.
- Intervention effect Fusarium root-wound inoculation rotted most roots within 14–30 days, whereas checks stayed healthy.
- Intervention effect The more virulent Fusarium strain totally rotted inoculated roots.
- Association Root rot severity rose with Fusarium virulence.
- Association Root rot severity fell as root starch content increased.
- Observation Only the most virulent Fusarium strain rotted high-starch roots of healthy trees.
- Mechanism The authors concluded Fusarium was not the primary cause of yellow shoot but could invade weakened roots.
- Intervention effect Bud inoculation transmitted yellow shoot to Cheokan and Ponkan at higher frequencies than checks.
- Mechanism The authors concluded that a virus is the primary causal agent of yellow shoot and that nursery trees carry and naturally transmit it.
- Recommendation The authors recommend strict quarantine to prevent further yellow shoot spread.