Factors affecting sporulation and infection of Peronospora sparsa in New Zealand boysenberry gardens
| Autor: | Monika Walter, Anusara M. Herath Mudiyanselage, Marlene V. Jaspers, Jason Smith, E. Eirian Jones, Hayley J. Ridgway |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
0303 health sciences Peronospora sparsa Sporangium BOYSENBERRY Horticulture Biology biology.organism_classification 01 natural sciences food.food Spore 03 medical and health sciences food Insect Science Downy mildew Peronospora rubi Agronomy and Crop Science Management practices 030304 developmental biology 010606 plant biology & botany |
| Zdroj: | New Zealand Plant Protection. 74:10-19 |
| ISSN: | 1179-352X 1175-9003 |
| DOI: | 10.30843/nzpp.2021.74.11726 |
| Popis: | Downy mildew, caused by Peronospora sparsa, is an economically important disease of boysenberries. Sporangia produced on infected tissue initiate berry infections; however the timing of sporangial release under New Zealand environmental conditions is unknown. The number of P. sparsa sporangia trapped on Vaseline®-coated slides placed weekly in three boysenberry gardens in the Nelson region from October to December in 2010 and September to December in 2011 was determined. Climate data were used to determine environmental factors that promoted sporangia production/release. Incidence of dryberry symptoms and sporulation on tissue samples incubated at 15 or 20°C under high relative humidity (RH) were assessed. Peronospora sparsa sporangia were observed on slides from all three sites, with peak sporangial numbers in mid-November in both years. Sites with the highest numbers of sporangia trapped in November had higher dryberry incidence in December. Data indicated that sporangial release was triggered by percentage of rainy days, RH and warm temperatures (16–23°C) in early spring, where high moisture periods promoted sporulation and a subsequent dry period allowed sporangial release. This study improves understanding of the timing of sporangial release to inform management practices. |
| Databáze: | OpenAIRE |
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