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Interference of Broadleaf Signalgrass (Brachiaria platyphylla) in Peanuts (Arachis hypogaea)

Published online by Cambridge University Press:  12 June 2017

Rick W. Chamblee ,
Lafayette Thompson Jr.  and
Harold D. Coble
Rick W. Chamblee
Affiliation:
Dep. Crop Sci., North Carolina State Univ., Raleigh, NC 27650
Lafayette Thompson Jr.
Affiliation:
Dep. Crop Sci., North Carolina State Univ., Raleigh, NC 27650
Harold D. Coble
Affiliation:
Dep. Crop Sci., North Carolina State Univ., Raleigh, NC 27650
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Abstract

Interference studies utilizing natural infestations of broadleaf signalgrass [Brachiaria platyphylla (Griseb.) Nash] in peanuts [Arachis hypogaea (L.) ‘Florigiant′] were conducted at two sites in 1978 and repeated at the same sites in 1979. Full-season interference from broadleaf signalgrass populations of 8, 16, and 1050 plants/10 m of row reduced seed yields 14, 28, and 69%, respectively. Linear regression analysis showed that slightly less than 4 plants/10 m of row significantly reduced yields. Broadleaf signalgrass interference with peanuts for 6 weeks or less after planting did not reduce seed yields; however, interference for 8 weeks or longer after planting did. Peanuts kept weed-free for 6 weeks or more after planting had seed yields equal to peanuts kept weed-free all season. Full-season broadleaf signalgrass interference reduced mature peanut forage yields 64%, but peanut interference only reduced broadleaf signalgrass forage yield 10%.

Keywords

Competitioneconomic thresholdintegrated pest management
Type
Research Article
Information
Weed Science , Volume 30 , Issue 1 , January 1982 , pp. 45 - 49
Copyright
Copyright © 1982 by the Weed Science Society of America 

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References

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