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Flooding for Johnsongrass Control

Published online by Cambridge University Press:  12 June 2017

C. G. McWhorter
C. G. McWhorter*
Affiliation:
S. Weed Sci. Lab., Plant Sci. Res. Div., Agr. Serv., U. S. Dep. of Agr., Stoneville, Mississippi 38776
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Abstract

Flooding soil with 5 to 10 cm of water for 7 to 14 days killed all freshly planted johnsongrass (Sorghum halepense (L.) Pers.) rhizomes in greenhouse and field experiments. A delay in flooding until culms emerged greatly reduced control. Flooding the soil in which 4-week-old johnsongrass plants grew had little effect at 15 C, but plants were killed after 8 weeks of flooding at 40 C. Death of buds on immersed johnsongrass rhizomes occurred more rapidly at 40 C than at 10, 20, 25, or 30 C. Flooding for 8 days at 40 C killed all rhizomes, but 16 days of flooding were required to kill all rhizomes at 30 C. Few buds were killed when flooded at 10 or 20 C, but germination was delayed. Immersing rhizomes in water and soil provided better control than immersing them in water without soil.

Type
Research Article
Information
Weed Science , Volume 20 , Issue 3 , May 1972 , pp. 238 - 241
Copyright
Copyright © Weed Science Society of America 

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References

Literature Cited

1. McWhorter, C. G. 1972. Factors affecting johnsongrass rhizome production and germination. Weed Sci. 20: (In press).CrossRefGoogle Scholar
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3. Millhollon, R. W. 1970. MSMA for johnsongrass control in sugarcane. Weed Sci. 18:333–336.Google Scholar