Abstract
The knowledge of the red rust disease remains limited in Cameroon, with a view to developing a control method. This work consisted in studying red rust on some fruit species such as Annona muricata (soursop), Dacryodes edulis (safou), Psidium guajava (guava) and Theobroma cacao (cocoa). Diseased leaves were collected in the field in the Maham site, in west region of Cameroon.The symptomatology of disease (colour, number and diameter of lesions) was studied. Coefficient of variation ( %) was calculated. The incidence and severity of the disease was assessed in the different orchards surveyed. The measurement of the different structures of the thallus (length, width of sporangia and sporangiophores) was carried out using a microscope with a micrometer. The disease is characterized by circular orange to orange-brown spots on the upper surfaces and rarely on the lower surface. Number of lesions, varied from 245–510 respectively with D. edulis and T cacao. Lesion diameters varied from 0.1−1 cm, 0.1−7 cm, 0.1−1.5 cm in safou (African pear), guava and soursop respectively. The length and width of sporangiophores varied from 280.5−714×10.2−25.5 µm for A. muricata, 408−612×15.3−25.5 µm for Dacryodes edulis, 433.3−663×15.3−20.4 µm for P. guajava and 484.5−612×20.4−35.7 µm for T. cacao. The number of sporangiophores varied from 1 to 11 at the maximum threshold. But, number of sporangia was the same in the four species, 1−9. The pathogenicity test was negative. The data measurements show that the specie observed is Cephaleurus virescens which is a parasitic alga. The data obtained are a basis for the development of an integrated control strategy against this emerging disease
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Claims 13
Claim · model-written summary
Red rust on the fruit species is characterized by circular orange to orange-brown spots on the upper leaf surfaces and rarely on the lower surface.
Not reportedDirection
Verbatim
e0“The disease is characterized by circular orange to orange-brown spots on the upper surfaces and rarely on the lower surface”
t0“fruits species in Cameroon”
Claim · model-written summary
Number of lesions varied from 245 to 510, with D. edulis and T. cacao respectively.
- Taxon
- D. edulis and T cacao
Theobroma cacao
Pachylobus edulise0 - Outcome
- Number of lesionse0
- Value
- 245–510e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Number of lesions, varied from 245–510 respectively with D. edulis and T cacao”
Claim · model-written summary
Lesion diameters in safou (African pear) ranged from 0.1 to 1 cm.
Verbatim
e0“Lesion diameters varied from 0.1−1 cm, 0.1−7 cm, 0.1−1.5 cm in safou (African pear), guava and soursop respectively”
Claim · model-written summary
Lesion diameters in guava ranged from 0.1 to 7 cm.
- Taxon
- guava
Psidium guajavae0 - Outcome
- Lesion diameterse0
- Value
- 0.1−7 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lesion diameters varied from 0.1−1 cm, 0.1−7 cm, 0.1−1.5 cm in safou (African pear), guava and soursop respectively”
Claim · model-written summary
Lesion diameters in soursop ranged from 0.1 to 1.5 cm.
- Taxon
- soursop
Annona muricatae0 - Outcome
- Lesion diameterse0
- Value
- 0.1−1.5 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lesion diameters varied from 0.1−1 cm, 0.1−7 cm, 0.1−1.5 cm in safou (African pear), guava and soursop respectively”
Claim · model-written summary
Sporangiophore length and width on A. muricata varied from 280.5-714 by 10.2-25.5 micrometres.
- Taxon
- A. muricataAnnona muricatae1
- Outcome
- length and width of sporangiophorese0
- Value
- 280.5−714×10.2−25.5 µme1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The length and width of sporangiophores varied”
e1“280.5−714×10.2−25.5 µm for A. muricata”
Claim · model-written summary
Sporangiophore length and width on Dacryodes edulis varied from 408-612 by 15.3-25.5 micrometres.
- Taxon
- Dacryodes edulisPachylobus edulise1
- Outcome
- length and width of sporangiophorese0
- Value
- 408−612×15.3−25.5 µme1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The length and width of sporangiophores varied”
e1“408−612×15.3−25.5 µm for Dacryodes edulis”
Claim · model-written summary
Sporangiophore length and width on P. guajava varied from 433.3-663 by 15.3-20.4 micrometres.
- Taxon
- P. guajavaPsidium guajavae1
- Outcome
- length and width of sporangiophorese0
- Value
- 433.3−663×15.3−20.4 µme1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The length and width of sporangiophores varied”
e1“433.3−663×15.3−20.4 µm for P. guajava”
Claim · model-written summary
Sporangiophore length and width on T. cacao varied from 484.5-612 by 20.4-35.7 micrometres.
- Taxon
- T. cacaoTheobroma cacaoe1
- Outcome
- length and width of sporangiophorese0
- Value
- 484.5−612×20.4−35.7 µme1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The length and width of sporangiophores varied”
e1“484.5−612×20.4−35.7 µm for T. cacao”
Claim · model-written summary
The number of sporangiophores varied from 1 to 11 at the maximum threshold.
Verbatim
e0“The number of sporangiophores varied from 1 to 11 at the maximum threshold”
t0“fruits species”
Claim · model-written summary
The number of sporangia was the same in the four species, 1-9.
Verbatim
e0“number of sporangia was the same in the four species, 1−9”
Claim · model-written summary
The pathogenicity test was negative.
Not reportedDirection
Verbatim
e0“The pathogenicity test was negative”
t0“fruits species”
Claim · model-written summary
Measurements indicate the observed organism is Cephaleurus virescens, a parasitic alga.
- Taxon
- fruits speciest0
- Interactor
- Cephaleurus virescense0parasite
- Outcome
- the specie observed is Cephaleurus virescense0
Not reportedDirection
Verbatim
e0“The data measurements show that the specie observed is Cephaleurus virescens which is a parasitic alga”
t0“fruits species”