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Research and IPM

Phenology Model Database

Wild Oats

Scientific name: Avena fatua

Phenology models predict timing of events in an organism's development. For many organisms which cannot internally regulate their own temperature, development is dependent on temperatures to which they are exposed in the environment.

Information in this database comes from published articles. It may be used in conjunction with field monitoring and a degree-day calculator.

Note: Before using a model that was not field tested in your location, you should test the model for one or more seasons under your conditions to verify that it will work for you.

Model 1 of 1

Cudney, D. W., L. S. Jordan, C. J. Corbett, and W. E. Bendixen. 1989. Developmental rates of wild oats (Avena fatua) and Wheat (Triticum aestivum). Weed Science 37: 521-524.

Location of study: California (field studies)

Developmental threshold

Method of calculation: not specified (UC IPM recommends Single Sine)

Degree-day accumulations required for each stage of development

Biofix: From emergence

Haun growth stage* DD (°F)DD (°C)
1 = Leaf 164.836.0
2 = Leaf 2156.687.0
3 = Leaf 3250.2139.0
4 = Leaf 4352.8196.0
5 = Leaf 5453.6252.0
6 = Leaf 6567.0315.0
7 = Leaf 7689.4383.0
8 = Leaf 8824.4458.0
9 = Flag leaf970.2539.0
10 = Extension of flag leaf 1134.0630.0
11 = Enlargement of boot 1320.0740.0
12 = Emergence of spike 1585.8881.0
13 = Elongation of culm 2158.21199.0

Degree-day accumulations required for each stage of development

Biofix: From previous stage

Haun growth stage*DD (°F)DD (°C)
1 = Leaf 164.836.0
2 = Leaf 291.851.0
3 = Leaf 393.652.0
4 = Leaf 4102.657.0
5 = Leaf 5100.856.0
6 = Leaf 6113.463.0
7 = Leaf 7122.468.0
8 = Leaf 8135.075.0
9 = Flag leaf 145.881.0
10 = Extension of flag leaf 163.891.0
11 = Enlargement of boot 198.0110.0
12 = Emergence of spike 253.8141.0
13 = Elongation of culm 574.2319.0

* For further explanation of the Haun growth stages see: Growth and development of small grains. IN: Integrated Pest Management for small grains. University of California Statewide IPM Project. Div. Agr. Sci. Publ. #3333.

Statewide IPM Program, Agriculture and Natural Resources, University of California
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