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Silverleaf Nightshade (Solanum elaeagnifolium) Control in Cotton (Gossypium hirsutum) with Glyphosate

Published online by Cambridge University Press:  12 June 2017

R. Brent Westerman  and
Don S. Murray
R. Brent Westerman
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
Don S. Murray
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
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Abstract

Glyphosate, alone and in combination with other herbicides or additives, was evaluated as a spot or shielded treatment for the control of silverleaf nightshade in cotton in three experiments over four years. Glyphosate used at 10.8 g ae/L in 1985 on dryland cotton controlled 81 to 98% of the silverleaf nightshade, but cotton lint yields were reduced by all treatments compared to the weed-free check. Glyphosate used at 7.2 g ae/L in 1986 on irrigated cotton controlled 6 to 83% of the silverleaf nightshade, and lint yields were reduced only when multiple spot applications were made. Spot applications of glyphosate were effective for silverleaf nightshade control when applied 7 wk after crop emergence in 1988. Weed control and cotton injury were lower with shielded applications than spot applications. In 1989, retreatments during a season or the next year resulted in 95% or greater silverleaf nightshade control. Cotton yield increases from herbicide treatment were not observed in 1988; however, yield increases were observed in 1989 when spot treatments were applied to the more successful 1988 plots.

Keywords

Glyphosate, N-(phosphonomethyl)glycinealachlor, 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide2,4-D, (2,4-dichlorophenoxy)acetic acidammonium sulfatecotton, Gossypium hirsutum L., ‘Coker 500,’ ‘Earlybird 3755,’ and ‘Paymaster 145’silverleaf nightshade, Solanum elaeagnifolium Cav. ♯ SOLELTime of applicationfrequency of applicationweeks after crop emergencecrop responsespot applicationsshielded applicationsapplication equipmentSOLEL
Type
Research
Information
Weed Technology , Volume 8 , Issue 4 , December 1994 , pp. 720 - 727
Copyright
Copyright © 1994 Weed Science Society of America 

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References

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