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Effects of Johnsongrass (Sorghum halepense) Density on Sugarcane (Saccharum officinarum) Yield

Published online by Cambridge University Press:  12 June 2017

Ahmed D. Ali ,
T. Eugene Reagan ,
Lynn M. Kitchen  and
Jeff L. Flynn
Ahmed D. Ali
Affiliation:
Dep. Entomol., Louisiana State Univ. Agric. Ctr., Baton Rouge 70803-1710
T. Eugene Reagan
Affiliation:
Dep. Entomol., Louisiana State Univ. Agric. Ctr., Baton Rouge 70803-1710
Lynn M. Kitchen
Affiliation:
Dep. Plant Pathol. and Crop Physiol., Louisiana State Univ. Agric. Ctr., Baton Rouge 70803-1710
Jeff L. Flynn
Affiliation:
Dep. Entomol., Louisiana Agric. Exp. Stn., Louisiana State Univ. Agric. Ctr., Baton Rouge 70803-1710
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Abstract

The effects of johnsongrass [Sorghum halepense (L.) Pers. # SORHA] infestations were determined during a 2-yr study on sugarcane (Saccharum officinarum L. ‘CP-65-357’) yield. Both cane and sugar yields were lower (36 and 31%, respectively) in plots heavily infested with johnsongrass than in weed-free plots. Sugarcane yields were inversely influenced by johnsongrass equivalents (the sum of the values obtained by multiplying the number of clumps by their corresponding importance value for each plot). In 1983, both johnsongrass standing crop and johnsongrass equivalents correlated negatively with cane yield much better than any other factor combinations, while in 1984, the same was true for stalk population. Substantial yield reductions from johnsongrass interference were observed at johnsongrass infestation levels higher than 15 to 35%.

Keywords

Weed interferenceweed competitionsugarcane borerDiatraea saccharalisSORHA
Type
Weed Biology and Ecology
Information
Weed Science , Volume 34 , Issue 3 , May 1986 , pp. 381 - 383
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

Literature Cited

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