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Preemergent Control of Long-Stalked Phyllanthus (Phyllanthus tenellus) and Leafflower (Phyllanthus urinaria)

Published online by Cambridge University Press:  12 June 2017

Jeffrey G. Norcini ,
Robert H. Stamps  and
James H. Aldrich
Jeffrey G. Norcini
Affiliation:
N. Florida Res. Edu. Ctr., Univ. Florida/IFAS, Rt. 4 Box 4092, Monticello, FL 32344
Robert H. Stamps
Affiliation:
Central Florida Res. and Edu. Ctr., Univ. Florida/IFAS, 2807 Binion Rd., Apopka, FL 32703
James H. Aldrich
Affiliation:
N. Florida Res. Edu. Ctr., Univ. Florida/IFAS
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Abstract

The efficacy of two applications of several PRE herbicides for extended control of long-stalked phyllanthus and leafflower were evaluated under container nursery conditions at two climatically different sites in Florida. Prodiamine at 4.5 kg ai/ha provided the longest and most consistent reductions in number, percent coverage (visual) of the medium, and dry weight of both species. Ten weeks of excellent PRE control (percent medium coverage ≤ 10%; number of weeds reduced by ≥ 70%) of both species was obtained at one site after the first and second applications of prodiamine at 2.2 or 4.5 kg ai/ha; two applications were required at the second site for similar control. Rates of the other herbicides were generally too low for excellent control of both species after one application, the exceptions being dithiopyr at 4.5 kg ai/ha and the preformulated combination of isoxaben and oryzalin (1.1 and 3.4 kg ai/ha, respectively). These herbicides provided good (10% < percent medium coverage ≤ 20%; number of weeds reduced by ≥ 70%) to excellent PRE control of long-stalked phyllanthus after the first and second applications at one site. Percent coverage of the medium by either species in untreated containers was 96 to 100%.

Keywords

Dithiopyr, S,S-dimethyl 2-(difluoromethyl)-4-(2-methylpropyl)-6-(trifluoromethyl)-3,5-pyridinedicarbothioateisoxaben, N-[3-(1-ethyl-1-methylpropyl)-5-(isoxazolyl]-2,6-dimethoxybenzamideoryzalin, 4-(dipropylamino)-3,5-(dinitrobenzenesulfonamide)prodiamine, 2,4-dinitro-N3,N3-dipropyl-6-(trifluoromethyl)-1,3-benzenediaminelong-stalked phyllanthus, Phyllanthus tenellus Roxb. # PYLTEPhyllanthus urinaria L. # PYLURLandscapenursery productionchamberbittergripe-weeddithiopyrisoxabenmetolachlororyzalinoxadiazonprodiaminePYLTEPYLUR
Type
Research
Information
Weed Technology , Volume 9 , Issue 4 , December 1995 , pp. 783 - 788
Copyright
Copyright © 1995 by the Weed Science Society of America 

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References

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