Abstract
Fungicide application strategies (timing, frequency, rates and mixtures) are important for the control and resistance management of potato late blight caused by Phytophthora infestans . The efficacy of fungicide mixtures consisting of fenamidone + mancozeb and propamocarb HCL + mancozeb at various rates and in spray regimes containing metalaxyl and mancozeb was evaluated for late blight control (US-1) at four locations in Kenya. Propamocarb HCL + mancozeb significantly ( P < 0.05) reduced foliar blight compared with mancozeb and the untreated control under moderate to severe disease pressure. Disease severity was significantly lower following application of propamocarb HCL + mancozeb at a rate of 4L ha -1 than at rates of 2L and 3L ha -1 in 1999 and 2000, but it was not significantly lower following applications at a rate of 3L ha -1 in 2000 and 2001. There were no significant differences in mean final late blight score among the three rates of 0.9, 1.0 and 1.1 kg ha -1 of fenamidone + mancozeb. All fungicide mixtures and application sequences significantly reduced the area under the disease progress curve and final late blight scores as compared with the unprotected control. Total and marketable tuber yield significantly ( P < 0.05) increased in all fungicide-treated plots.
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Claims 6
Claim · model-written summary
Propamocarb HCL + mancozeb significantly reduced foliar late blight on potato compared with mancozeb and the untreated control under moderate to severe disease pressure.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- Propamocarb HCL + mancozebe0
- Interactor
- Phytophthora infestans
Phytophthora infestanst0pathogen - Outcome
- foliar blighte0
- Direction
- reducede0
- Comparator
- mancozeb and the untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Propamocarb HCL + mancozeb significantly ( P < 0.05) reduced foliar blight compared with mancozeb and the untreated control under moderate to severe disease pressure”
t0“Phytophthora infestans (US-1) on potato”
Claim · model-written summary
Disease severity was significantly lower with propamocarb HCL + mancozeb at 4L per ha than at 2L and 3L per ha in 1999 and 2000.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- propamocarb HCL + mancozeb at a rate of 4L ha -1e0
- Interactor
- Phytophthora infestansPhytophthora infestanst0pathogen
- Outcome
- Disease severitye0
- Direction
- lowere0
- Comparator
- rates of 2L and 3L ha -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease severity was significantly lower following application of propamocarb HCL + mancozeb at a rate of 4L ha -1 than at rates of 2L and 3L ha -1 in 1999 and 2000”
t0“Phytophthora infestans (US-1) on potato”
Claim · model-written summary
Disease severity was not significantly lower following propamocarb HCL + mancozeb at 3L per ha in 2000 and 2001.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- applications at a rate of 3L ha -1e0
- Interactor
- Phytophthora infestansPhytophthora infestanst0pathogen
- Outcome
- Disease severitye0
- Direction
- not significantly lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease severity was significantly lower following application of propamocarb HCL + mancozeb at a rate of 4L ha -1 than at rates of 2L and 3L ha -1 in 1999 and 2000, but it was not significantly lower following applications at a rate of 3L ha -1 in 2000 and 2001”
t0“Phytophthora infestans (US-1) on potato”
Claim · model-written summary
There were no significant differences in mean final late blight score among the three rates of fenamidone + mancozeb (0.9, 1.0 and 1.1 kg per ha).
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- fenamidone + mancozebe0
- Interactor
- Phytophthora infestansPhytophthora infestanst0pathogen
- Outcome
- mean final late blight scoree0
- Direction
- no significant differencese0
- Comparator
- three rates of 0.9, 1.0 and 1.1 kg ha -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were no significant differences in mean final late blight score among the three rates of 0.9, 1.0 and 1.1 kg ha -1 of fenamidone + mancozeb”
t0“Phytophthora infestans (US-1) on potato”
Claim · model-written summary
All fungicide mixtures and application sequences significantly reduced the area under the disease progress curve and final late blight scores compared with the unprotected control.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- All fungicide mixtures and application sequencese0
- Interactor
- Phytophthora infestansPhytophthora infestanst0pathogen
- Outcome
- area under the disease progress curve and final late blight scorese0
- Direction
- reducede0
- Comparator
- the unprotected controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All fungicide mixtures and application sequences significantly reduced the area under the disease progress curve and final late blight scores as compared with the unprotected control”
t0“Phytophthora infestans (US-1) on potato”
Claim · model-written summary
Total and marketable tuber yield significantly increased in all fungicide-treated plots.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- all fungicide-treated plotse0
- Outcome
- Total and marketable tuber yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total and marketable tuber yield significantly ( P < 0.05) increased in all fungicide-treated plots”
t0“Phytophthora infestans (US-1) on potato”
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