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Herbicides to Prevent Seed Set or Germination of Medusahead

  • Raymond A. Evans (a1), Burgess L. Kay (a2) and Cyrus M. McKell (a3) (a4)

Abstract

3-Amino-1,2,4-triazole (amitrole) sprayed on annual grassland infested with medusahead (Elymus caput-medusae L.) at 1/2 to 4 lb/A when medusahead was in the boot or soft dough stage reduced viable caryopses from 60 to 100 percent, and seed production the following year from 75 to almost 100 percent. 1,2-Dihydropyridazine-3-6-dione (maleic hydrazide) and 2,2-dichloropropionic acid (dalapon) reduced viability of medusahead seeds, but were less effective than amitrole. Viable caryopses of soft chess (Bromus mollis L.) were reduced and the year following treatment soft chess was decreased in the stands by early application (boot stage of medusahead) but not by late application of herbicides, when the soft chess heads were dry.

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References

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1 Crafts, A. S. 1961. The chemistry and mode of action of herbicides. Interscience Publishers, New York, 289p. (189).
2. Duncan, D. B. 1955. Multiple range and multiple F. tests. Biometrics 11:142.
3. Evans, R. A. and Love, R. M. 1957. The step-point method of sampling—A practical tool in range research. J. Range Mgmt. 10:208212.
4. Furtick, W. R. and Chilcote, D. O. 1960. The responses of small grains to amitrole at various growth stages. Weed Society of America, Abstracts, p. 2.
5. Major, J., McKell, C. M., and Berry, L. J. 1960. Improvements of medusahead—infested rangeland. California Agric. Expt. Sta. Ext. Serv. Leaf. 123, 8p.
6. McKell, C. M., Kay, B. L. and Major, J. 1959. Herbicides on rangeland forage. California Agric. 13 (4): 715.
7. McKell, C. M., Wilson, A. M., and Kay, B. L. 1962. Effective burning of rangelands infested with medusahead. Weeds 10:125131.

Herbicides to Prevent Seed Set or Germination of Medusahead

  • Raymond A. Evans (a1), Burgess L. Kay (a2) and Cyrus M. McKell (a3) (a4)

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