Abstract
Management of early leaf spot (Cercospora arachidicola) and late leaf spot (Cercosporidium personatum) of peanut (Arachis hypogaea) in the southeastern U.S. is dependent upon multiple applications of foliar fungicides. Field experiments were conducted from 1997 to 2000 to compare the efficacy of mixtures of copper hydroxide or copper oxychloride and reduced rates of chlorothalonil with that of full rates of chlorothalonil alone or chlorothalonil + propiconazole. In all tests, rates per ha of 0.70 kg of chlorothalonil + 0.70 kg of copper oxychloride or higher provided leaf spot control that was similar (P > 0.05) to that achieved with standard rates of chlorothalonil (0.84 kg/ha) + propiconazole (0.063 kg/ha). Application of chlorothalonil at 0.56 kg/ha + copper oxychloride at 0.56 kg/ha controlled leaf spot as well as (P > 0.05) chlorothalonil alone at 1.26 kg/ha in five of six tests in which that treatment was evaluated. In three of four tests in 1998 and 1999, application of chlorothalonil at 0.63 kg/ha + copper hydroxide at 0.63 kg/ha controlled leaf spot as well as chlorothalonil alone at 1.26 kg/ha. In both tests in 2000, application of chlorothalonil at 0.84 kg/ha + copper hydroxide at 0.63 kg/ha controlled leaf spot as well as chlorothalonil alone at 1.26 kg/ha. There were no consistent yield differences among the chlorothalonil, chlorothalonil + propiconazole, or chlorothalonil + copper treatments. Accepted for publication 8 November 2001. Published 16 November 2001.
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Claims 5
Claim · model-written summary
Chlorothalonil plus copper oxychloride at 0.70 kg/ha each controlled leaf spot similarly to standard chlorothalonil plus propiconazole.
- Taxon
- Peanut
Arachis hypogaeat0 - Treatment
- 0.70 kg of chlorothalonil + 0.70 kg of copper oxychloride or highere0
- Outcome
- leaf spot controle0
- Direction
- similare0
- Comparator
- standard rates of chlorothalonil (0.84 kg/ha) + propiconazole (0.063 kg/ha)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rates per ha of 0.70 kg of chlorothalonil + 0.70 kg of copper oxychloride or higher provided leaf spot control that was similar (P > 0.05) to that achieved with standard rates of chlorothalonil (0.84 kg/ha) + propiconazole (0.063 kg/ha)”
t0“Peanut”
Claim · model-written summary
The 0.56 kg/ha chlorothalonil plus copper oxychloride mixture matched 1.26 kg/ha chlorothalonil alone in five of six tests.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- chlorothalonil at 0.56 kg/ha + copper oxychloride at 0.56 kg/hae0
- Outcome
- leaf spote0
- Direction
- as well ase0
- Qualifier
- five of six testse0
- Comparator
- chlorothalonil alone at 1.26 kg/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of chlorothalonil at 0.56 kg/ha + copper oxychloride at 0.56 kg/ha controlled leaf spot as well as (P > 0.05) chlorothalonil alone at 1.26 kg/ha in five of six tests”
t0“Peanut”
Claim · model-written summary
The 0.63 kg/ha chlorothalonil plus copper hydroxide mixture matched chlorothalonil alone in three of four tests.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- chlorothalonil at 0.63 kg/ha + copper hydroxide at 0.63 kg/hae0
- Outcome
- leaf spote0
- Direction
- as well ase0
- Qualifier
- three of four tests in 1998 and 1999e0
- Comparator
- chlorothalonil alone at 1.26 kg/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In three of four tests in 1998 and 1999, application of chlorothalonil at 0.63 kg/ha + copper hydroxide at 0.63 kg/ha controlled leaf spot as well as chlorothalonil alone at 1.26 kg/ha.”
t0“Peanut”
Claim · model-written summary
The 0.84 plus 0.63 kg/ha chlorothalonil-copper hydroxide mixture matched chlorothalonil alone in both 2000 tests.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- chlorothalonil at 0.84 kg/ha + copper hydroxide at 0.63 kg/hae0
- Outcome
- leaf spote0
- Direction
- as well ase0
- Qualifier
- both tests in 2000e0
- Comparator
- chlorothalonil alone at 1.26 kg/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both tests in 2000, application of chlorothalonil at 0.84 kg/ha + copper hydroxide at 0.63 kg/ha controlled leaf spot as well as chlorothalonil alone at 1.26 kg/ha.”
t0“Peanut”
Claim · model-written summary
Yield did not differ consistently among the tested fungicide treatments.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- chlorothalonil + copper treatmentse0
- Outcome
- yield differencese0
- Direction
- no consistente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were no consistent yield differences among the chlorothalonil, chlorothalonil + propiconazole, or chlorothalonil + copper treatments.”
t0“Peanut”
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