| spatial and temporal stability of the estimated parameters of the binary power law. | the incidence of hop powdery mildew on leaves, caused by podosphaera macularis, collected from 1,606 transects in 77 commercial hop yards in oregon and washington over 9 years was used to assess variability in heterogeneity of disease and the estimated binary power law parameters. spatial analyses of data sets were conducted at the level of individual rows (row level) and multiple rows within a yard (yard level). the binary power law provided a good fit to all data sets, with r(2) values ranging ... | 2008 | 18943457 |
| effects of powdery mildew fungicide programs on twospotted spider mite (acari: tetranychidae), hop aphid (hemiptera: aphididae), and their natural enemies in hop yards. | twospotted spider mite, tetranychus urticae koch (acari: tetranychidae), and hop aphid, phorodon humuli (schrank) (hemiptera: aphididae), are the most important arthropod pests of hop (humulus lupulus l.) in the northern hemisphere. a potential barrier for greater adoption of conservation biological control strategies for spider mites and hop aphid is the extensive use of fungicides for management of hop powdery mildew, podosphaera macularis (wallr.:fr.) u. braun & s. takamatsu. field studies co ... | 2009 | 19253646 |