| |
| Web URL(s): | http://apsjournals.apsnet.org/doi/abs/10.1094/PDIS-05-16-0609-RE
Last checked: 08/08/2017
Access conditions: Item is within a limited-access website
http://apsjournals.apsnet.org/doi/pdfplus/10.1094/PDIS-05-16-0609-RE
Last checked: 08/08/2017
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
|---|
| Publication Type:
| Refereed |
|---|
| Author(s): | Dung, Jeremiah K. S.;
Alderman, Stephen C.;
Kaur, Navneet;
Walenta, Darrin L.;
Frost, Kenneth E.;
Hamm, Philip B. |
|---|
| Author Affiliation: | Dung: Department of Botany and Plant Pathology, Central Oregon Agricultural Research Center, Oregon State University, Madras, OR; Alderman: USDA-ARS National Forage Seed Production Research Center, Corvallis, OR; Kaur, Frost, and Hamm: Department of Botany and Plant Pathology, Hermiston Agricultural Research and Extension Center, Oregon State University, Hermiston, OR; Walenta: Department of Crop and Soil Science, Union County Extension Center, La Grande, OR |
|---|
| Title: | Identification of environmental factors related to Claviceps purpurea ascospore production in perennial ryegrass seed fields and development of predictive models |
|---|
| Source: | Plant Disease. Vol. 101, No. 6, June 2017, p. 895-906. |
|---|
| Publishing Information: | [Washington, D.C.]: Bureau of Plant Industry, U.S. Dept. of Agriculture |
|---|
| # of Pages: | 12 |
|---|
| Keywords: | TIC Keywords: Application timing; Claviceps purpurea; Disease forecasting; Disease incidence; Environmental factors; Fungicide efficacy; Lolium perenne; Seed crops; Spore diseases; Weather patterns
|
|---|
| Abstract/Contents: | "Claviceps purpurea, the causal agent of ergot of perennial ryegrass seed crops, overwinters as sclerotia in the soil and releases airborne ascospores in the spring that infect flower ovaries and replace seed with sclerotia. Burkard spore traps were used to quantify the dispersal phenology and concentration of ascospores in perennial ryegrass seed fields in the Columbia Basin of Oregon. Weather factors were measured concurrently with spore trapping. Nonparametric regression, box-and-whisker plots, and univariate analysis were used to visualize and identify trends between ascospore concentrations and weather variables. Most ascospores (75.4%) were trapped when minimum soil temperatures were between 16.2 and 20.4°C. Over 67% of the total ascospores trapped were observed when minimum air temperatures were between 6.8 and 12.4°C and 64% of ascospores were trapped when daily mean dew point was between 3.7 and 8.2°C. Environmental favorability index (EFI) models were developed and validated based on their ability to predict ascospore occurrence. The EFI models were able to predict ascospore occurrence with an accuracy of 71.7 to 87.5% depending on the year. The models were up to 79.8% accurate when validated using three years of historical spore trap data not used in the EFI model development. Ninety-four percent of ascospores were trapped when cumulative air degree days, using lower and upper thresholds of 10 and 25°C, respectively, were between 230 and 403. These results suggest that weather parameters can be used to model C. purpurea ascospore occurrence and potentially improve the timing and efficacy of fungicide applications by identifying when plant protection is most needed." |
|---|
| Language: | English |
|---|
| References: | 44 |
|---|
| Note: | Tables
Graphs |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dung, J. K. S., S. C. Alderman, N. Kaur, D. L. Walenta, K.E. Frost, and P. B. Hamm. 2017. Identification of environmental factors related to Claviceps purpurea ascospore production in perennial ryegrass seed fields and development of predictive models. Plant Disease. 101(6):p. 895-906. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=288027 |
| If there are problems with this record, send us feedback about record 288027. |
| Choices for finding the above item: |
|---|
| Web URL(s):
http://apsjournals.apsnet.org/doi/abs/10.1094/PDIS-05-16-0609-RE
Last checked: 08/08/2017
Access conditions: Item is within a limited-access website
http://apsjournals.apsnet.org/doi/pdfplus/10.1094/PDIS-05-16-0609-RE
Last checked: 08/08/2017
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
| 
MSU catalog number: b2191617 |
| Find from within TIC:
Digitally in TIC by record number. |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
