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Phenology Model Database

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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

Lower: 41.0°F (5.0°C)

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 1	64.8	36.0
2 = Leaf 2	156.6	87.0
3 = Leaf 3	250.2	139.0
4 = Leaf 4	352.8	196.0
5 = Leaf 5	453.6	252.0
6 = Leaf 6	567.0	315.0
7 = Leaf 7	689.4	383.0
8 = Leaf 8	824.4	458.0
9 = Flag leaf	970.2	539.0
10 = Extension of flag leaf	1134.0	630.0
11 = Enlargement of boot	1320.0	740.0
12 = Emergence of spike	1585.8	881.0
13 = Elongation of culm	2158.2	1199.0

Degree-day accumulations required for each stage of development

Biofix: From previous stage

Haun growth stage*	DD (°F)	DD (°C)
1 = Leaf 1	64.8	36.0
2 = Leaf 2	91.8	51.0
3 = Leaf 3	93.6	52.0
4 = Leaf 4	102.6	57.0
5 = Leaf 5	100.8	56.0
6 = Leaf 6	113.4	63.0
7 = Leaf 7	122.4	68.0
8 = Leaf 8	135.0	75.0
9 = Flag leaf	145.8	81.0
10 = Extension of flag leaf	163.8	91.0
11 = Enlargement of boot	198.0	110.0
12 = Emergence of spike	253.8	141.0
13 = Elongation of culm	574.2	319.0

* 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.

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