Abstract
Leaf rust was first observed in 1997 on southern high-bush blueberry (Vaccinium corymbosum L.) cvs. Sharpblue, Gulfcoast, and Misty, in two production fields in Huelva Province of Andalucía, in southwestern Spain. Depending on environmental conditions, these cultivars may remain evergreen in this region. In early spring, when the temperature reaches 20°C, typical yellowish-orange pustules first appear on the abaxial side of older leaves and later on new leaves. Leaf lesions began as chlorotic dots and developed into necrotic spots. As much as 85% of the fruits on symptomatic bushes showed pustules on the scar area. Multiple infection cycles were possible during the growing season as urediniospores reinfect leaves at the end of summer. Disease was considered of minor importance, but defoliation occurred when spotting was severe. Urediniospores were yellowish-orange, abovoid to elliptical (15 to 26 × 10 to 20 μm), with a thick, slightly roughened wall and a central pore. Telia formed in the lower epidermis and were smooth and brown. Teliospores (7 to 10 × 12 to 15 μm) were sessile, oblong to columnar, with two or more cross walls. Urediniospore and teliospore dimensions and morphology agree with the description of P. vaccinii, (G. Wint.) (1). A pathogenicity test was carried out with 2-year-old 'Sharpblue' and 'Star' plants. Expanded leaves were sprayed with freshly collected urediniospores suspended in a 0.05% solution of Tween 20 in water; plants were covered with plastic bags for 48 h and held in a chamber at 20 to 25°C in the shade. After 10 days, yellowish-orange pustules, similar to the original symptoms, developed on 80% of inoculated leaves of 'Sharpblue', while 'Star' plants remained symptomless. Leaf rust has not been reported on Ericaceae in Spain. The evergreen state of some southern high-bush cultivars in this area could allow the pathogen to overwinter as urediniospores. To our knowledge, this is the first report of P. vaccinii on blueberry plants in Spain. Reference: (1) P. R. Bristow and A. W. Stretch. Pages 20-22 in: Compendium of Blueberry and Cranberry Diseases. F. L. Caruso and D. C. Ramsdell, eds. American Phytopathological Society, St. Paul, MN, 1995.
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Claims 7
Claim · model-written summary
Leaf rust was observed on three blueberry cultivars in Huelva Province in 1997.
- Taxon
- southern high-bush blueberrye0
- Material
- Sharpblue, Gulfcoast, and Mistye0
- Interactor
- Pucciniastrum vaccinii
Naohidemyces vacciniit0pathogen - Outcome
- Leaf ruste0
- Setting
- Huelva Province of Andalucíae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf rust was first observed in 1997 on southern high-bush blueberry (Vaccinium corymbosum L.) cvs. Sharpblue, Gulfcoast, and Misty, in two production fields in Huelva Province of Andalucía, in southwestern Spain”
t0“Pucciniastrum vaccinii”
Claim · model-written summary
Pustules appeared on older then new leaves, and lesions progressed from chlorotic dots to necrotic spots.
- Taxon
- Blueberryt0
- Organ / stage
- older leavese0
- Interactor
- Pucciniastrum vacciniiNaohidemyces vacciniit0pathogen
- Outcome
- yellowish-orange pustulese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“typical yellowish-orange pustules first appear on the abaxial side of older leaves and later on new leaves. Leaf lesions began as chlorotic dots and developed into necrotic spots”
t0“Southern High-Bush Blueberry Caused by Pucciniastrum vaccinii”
Claim · model-written summary
Up to 85% of fruit on symptomatic bushes had scar-area pustules.
- Taxon
- Blueberryt0
- Interactor
- Pucciniastrum vacciniiNaohidemyces vacciniit0pathogen
- Outcome
- pustules on the scar areae0
- Value
- 85%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As much as 85% of the fruits on symptomatic bushes showed pustules on the scar area”
t0“Southern High-Bush Blueberry Caused by Pucciniastrum vaccinii”
Claim · model-written summary
Severe spotting caused defoliation.
- Taxon
- Blueberryt0
- Interactor
- Pucciniastrum vacciniiNaohidemyces vacciniit0pathogen
- Outcome
- defoliatione0
- Qualifier
- spotting was severee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“defoliation occurred when spotting was severe”
t0“Southern High-Bush Blueberry Caused by Pucciniastrum vaccinii”
Claim · model-written summary
Inoculated Sharpblue leaves developed pustules at 80% incidence after ten days.
- Taxon
- Blueberryt0
- Material
- Sharpbluee0
- Treatment
- inoculated leavese0
- Interactor
- Pucciniastrum vacciniiNaohidemyces vacciniit0pathogen
- Outcome
- yellowish-orange pustulese0
- Value
- 80%e0
- Comparator
- 'Star' plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 10 days, yellowish-orange pustules, similar to the original symptoms, developed on 80% of inoculated leaves of 'Sharpblue', while 'Star' plants remained symptomless”
t0“Southern High-Bush Blueberry Caused by Pucciniastrum vaccinii”
Claim · model-written summary
Star plants remained symptomless after the pathogenicity test.
- Taxon
- Blueberryt0
- Material
- Stare0
- Interactor
- Pucciniastrum vacciniiNaohidemyces vacciniit0pathogen
- Outcome
- remained symptomlesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“'Star' plants remained symptomless”
t0“Southern High-Bush Blueberry Caused by Pucciniastrum vaccinii”
Claim · model-written summary
The authors report this as the first occurrence of P. vaccinii on blueberry in Spain.
- Taxon
- blueberrye0
- Interactor
- P. vacciniiNaohidemyces vacciniie0pathogen
- Outcome
- first reporte0
- Setting
- Spaine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this is the first report of P. vaccinii on blueberry plants in Spain”