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Black Stem Rust Reduces Big Sagebrush Seed Production

1995; University of Arizona; Volume: 48; Issue: 5 Linguagem: Inglês

10.2307/4002241

2162-2728

Bruce L. Welch, David Lee Nelson,

Plant and Fungal Interactions Research

We conducted an experiment to determine the effects of a rust caisme on big sagebrush (Arfemisia tridentata Nutt.) seed production.We ranked 760 plants as to disease intensity in an established 'Hobble Creek' mountain big sagebrush (Arfemisia tridentafa ssp.vaseyana Rydb.Beetle) seed-increase garden.These rankings were divided into 4 classes: I. very light intensity; II.light intensity; III.medium intensity; and IV.heavy intensity.Three years after planting all plants in the test showed signs of infection.The heavier the infection the fewer seeds produced.Cost of the rust disease was estimated at about $3,562 ha-l.