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Autecology and Population Biology of Dyers Woad (Isatis tinctoria)

Published online by Cambridge University Press:  12 June 2017

Kassim O. Farah ,
Ann F. Tanaka  and
Neil E. West
Kassim O. Farah
Affiliation:
Utah State Univ., Logan, UT 84322-5230
Ann F. Tanaka
Affiliation:
Utah State Univ., Logan, UT 84322-5230
Neil E. West
Affiliation:
Utah State Univ., Logan, UT 84322-5230
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Abstract

Dyers woad (Isatis tinctoria L. # ISATI) has greatly expanded on rangelands in the Intermountain region. Herbicidal and tillage controls are not feasible on rangelands. Better knowledge of the biology of this species could help in the development of biological controls. We examined characteristics that could assist in this effort. Seed viability remained high and relatively stable, but germination decreased over a 10-month period. The seed dispersal pattern of dyers woad was best described by a negative exponential model (log10 y = 1.92-0.02x; r2=0.60), where y equals seeds/m2 and x = distance from mother plant (cm). The root system of dyers woad is dominated by a taproot with some laterals in the upper 30 cm of the soil profile. Survivorship of experimentally established populations monitored over 2 yr showed constriction at two stages: 1) germination and establishment, and 2) young rosette. The latter stage should be targeted for biological control.

Keywords

Phenologyseed viabilityseed dispersalISATI
Type
Weed Biology and Ecology
Information
Weed Science , Volume 36 , Issue 2 , March 1988 , pp. 186 - 193
Copyright
Copyright © 1988 by the Weed Science Society of America 

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