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Influence of Planting Date on Growth of Ivyleaf Morningglory (Ipomoea hederacea) in Cotton (Gossypium hirsutum)

Published online by Cambridge University Press:  12 June 2017

Paul E. Keeley ,
Robert J. Thullen  and
Charles H. Carter
Paul E. Keeley
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Shafter, CA 93263
Robert J. Thullen
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Shafter, CA 93263
Charles H. Carter
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Shafter, CA 93263
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Abstract

Ivyleaf morningglory [Ipomoea hederacea (L.) Jacq. # IPOHE], planted in 1984 and 1985 the first of each month from April through August, began emerging in cotton (Gossypium hirsutum L. ‘Acala SJ-2’) 1 week after planting. Morningglory, at a density of 1 plant/2 m of row, emerging in April and May became so competitive to cotton by harvest in September that the total crop was lost. June plantings, although less competitive than earlier plantings, still reduced yields by 11%. Later plantings did not reduce yields of cotton. Morningglory plantings that produced seed (April through July) began flowering within 7 weeks, and viable seed was collected for the first time 9 weeks after planting. Ivyleaf morningglory plants that emerged in April and May produced about 11 000 seed/plant by cotton harvest. This compared to 3000 and 93 seed/plant for morningglory that emerged in June and July, respectively. The earliest that morningglory might be expected to produce seed in cotton planted in early April would be late May to early June, and morningglory emerging as late as the first of July could produce some seed by cotton harvest.

Keywords

Weed growthweed reproductioncotton yieldsIPOHE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 34 , Issue 6 , November 1986 , pp. 906 - 910
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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