Publications by authors named "Peter H Dernoeden"
ABSTRACT Dead spot (Ophiosphaerella agrostis) is a damaging disease of young View Article and Find Full Text PDF
Article Synopsis
- The study investigates the factors influencing the release of ascospores from Ophiosphaerella agrostis, which causes dead spot disease in creeping bentgrass.
- Researchers found that a sharp drop in humidity can lead to a rapid discharge of ascospores, whether in light or dark environments.
- In field observations, ascospore release peaks occur during early mornings and evenings, particularly when humidity decreases or dew forms, and rain events significantly trigger ascospores’ release shortly after they begin.
Dead spot of creeping bentgrass is incited by Ophiosphaerella agrostis. The objectives of this 3-year field study were to: (i) elucidate environmental conditions associated with the expression of dead spot symptoms, (ii) develop a model to assist in predicting the appearance of dead spot symptoms and epidemics in creeping bentgrass, and (iii) elucidate the association between ascospore release and the appearance of new dead spot symptoms. Environmental parameters measured included relative humidity (RH), air (AT) and soil (ST) temperatures, solar irradiance (SOL), precipitation and irrigation (RAIN), and leaf wetness duration (LWD).
View Article and Find Full Text PDFDead spot (Ophiosphaerella agrostis) is a relatively new disease of young creeping bentgrass and hybrid bermudagrass putting greens in the United States. Little is known about the biology or genetic diversity of the pathogen. O.
View Article and Find Full Text PDFArticle Synopsis
- A new study focuses on developing a fast and accurate method to identify the fungus Ophiosphaerella agrostis, which causes dead spot disease in creeping bentgrass and hybrid bermudagrass.
- The researchers created specific oligonucleotide primers that target unique DNA sequences in O. agrostis, allowing for the detection of the fungus within infected grass tissues without cross-reacting with other similar pathogens.
- This polymerase chain reaction (PCR) technique can deliver results in about 4 hours, speeding up the diagnosis process for turf managers dealing with dead spot disease.
Bentgrass dead spot (BDS) is a disease of creeping bentgrass incited by Ophiosphaerella agrostis. This project was designed to determine the susceptibility of field-grown bentgrass cultivars to BDS and to gather information regarding the geographic distribution and field conditions favoring the disease. In a field cultivar evaluation trial, all major Agrostis spp.
View Article and Find Full Text PDFPutting green samples (n = 109) were inspected for the presence of Pythium oospores in roots of plants from golf courses (n = 39) in Maryland and adjacent states. Twenty-eight Pythium isolates were recovered from creeping bentgrass (Agrostis palustris) (n = 25) and annual bluegrass (Poa annua) (n = 3) plants. Most isolates associated with Pythium-induced root dysfunction were from greens less than 3 years of age and were obtained primarily between March and June, 1995 to 1997.
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