| Autor: |
Luo Y; Department of Plant Pathology, University of California-Davis, Kearney Agricultural Research and Extension Center, Parlier, CA 93648., Niederholzer FJA; University of California Cooperative Extension, Colusa/Sutter/Yuba Counties, Yuba City, CA 95991., Lightle DM; University of California Cooperative Extension, Butte/Glenn/Tehama Counties, Orland, CA 95963., Felts D; Department of Plant Pathology, University of California-Davis, Kearney Agricultural Research and Extension Center, Parlier, CA 93648., Lake J; Department of Plant Pathology, University of California-Davis, Kearney Agricultural Research and Extension Center, Parlier, CA 93648., Michailides TJ; Department of Plant Pathology, University of California-Davis, Kearney Agricultural Research and Extension Center, Parlier, CA 93648. |
| Jazyk: |
angličtina |
| Zdroj: |
Phytopathology [Phytopathology] 2021 Nov; Vol. 111 (11), pp. 1963-1971. Date of Electronic Publication: 2021 Nov 07. |
| DOI: |
10.1094/PHYTO-01-21-0009-R |
| Abstrakt: |
Prevalence of latent infections of the canker-causing fungi Botryosphaeria dothidea and species of Cytospora , Diplodia , Lasiodiplodia , Neofusicoccum , and Phomopsis in young shoots of almond, prune, and walnut trees in California was studied to test the hypotheses that latent infections accumulate from current-season shoots to 1-year-old shoots in the orchard and there are distinct associations among pathogen taxa present as latent infections in the same shoot. Samples of newly emerged and 1-year-old shoots were periodically collected in each almond, prune, and walnut orchard for two growing seasons. A real-time quantitative PCR assay was used to quantify latent infection with three parameters: incidence, molecular severity, and latent infection index. Diplodia spp. were absent from most samples. For almond, Lasiodiplodia spp. and Cytospora spp. were detected with a maximum incidence >90%, while B. dothidea and Neofusicoccum spp. incidence was <20% in most cases. In prune orchards, the incidence levels of B. dothidea were >50% in most cases, while those of Cytospora spp. and Lasiodiplodia spp. were 30 to 60% and 30 to 100%, respectively. For walnut, many samplings showed higher incidence in 1-year-old (30 to 80%) than in newly emerged shoots (10 to 50%). Accumulation of latent infection between the two shoot age classes was detected in only a few cases. The percentages of samples showing coexistence of two, three, and four pathogen taxa in the same shoot were 20 to 25, <10, and <5%, respectively. Pairwise associations among pathogen taxa in the same shoot were significant in many cases. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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