Abstract
The impact of Ridomil Plus® (12% metalaxyl + 60% cuprous oxide) spray rate and frequency on the severity of potato late blight, caused by Phytophthora infestans, was evaluated during 1997 and 1999 in Dschang, Cameroon. A randomised complete block design was used in both experiments. In 1997, plots were sprayed with 0.6, 1.2, 2.4, or 4.8 kg a.i.ha-1 of Ridomil Plus®, while in 1999, they were treated once, twice or thrice with 2.4 kg a.i.ha-1 of the fungicide. In both trials control plots were not sprayed. Late blight intensity was recorded weekly and yields were obtained at harvest. Fungicide applications reduced late blight intensity and consequently increased potato tuber yields. Marketable yields were significantly higher in the resistant variety, Cipira (22.4 - 34.8 t ha-1), than in the susceptible variety, Tezelfeu (4.0 - 12.0 t ha-1). A significant quadratic relationship existed between the rate or number of fungicide applications and tuber yields. Economic analyses indicated that two sprays of the fungicide at 2.4 kg a.i. ha-1 are necessary for a good late blight protection programme in potato. This spray regime resulted to increases in net returns of US$ 1947 to 3327 ha-1. Results also suggest that high rates or frequencies of fungicide applications do not necessarily lead to better economic benefits. Key Words: Economic gains, fungicide application, Phytophthora infestans, Solanum tuberosum (African Crop Science Journal 2001 9(1): 235-244)
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Claims 7
Claim · model-written summary
Fungicide applications reduced potato late blight intensity.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- Fungicide applicationse0
- Interactor
- Phytophthora infestans
Phytophthora infestanse1pathogen - Outcome
- late blight intensitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fungicide applications reduced late blight intensity”
e1“caused by Phytophthora infestans”
t0“potato”
Claim · model-written summary
Fungicide applications increased potato tuber yields.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- Fungicide applicationse0
- Outcome
- potato tuber yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fungicide applications reduced late blight intensity and consequently increased potato tuber yields”
Claim · model-written summary
Marketable yields were higher in resistant Cipira than susceptible Tezelfeu.
- Taxon
- potatoSolanum tuberosumt0
- Material
- Cipirae0
- Outcome
- Marketable yieldse0
- Direction
- highere0
- Value
- 22.4 - 34.8 t ha-1e0
- Qualifier
- 4.0 - 12.0 t ha-1e0
- Comparator
- Tezelfeue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Marketable yields were significantly higher in the resistant variety, Cipira (22.4 - 34.8 t ha-1), than in the susceptible variety, Tezelfeu (4.0 - 12.0 t ha-1).”
t0“potato”
Claim · model-written summary
Tuber yields had a significant quadratic relationship with fungicide rate or application number.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- fungicide applicationse0
- Outcome
- tuber yieldse0
- Qualifier
- quadratic relationshipe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significant quadratic relationship existed between the rate or number of fungicide applications and tuber yields.”
t0“potato”
Claim · model-written summary
Two sprays at 2.4 kg a.i. ha-1 were recommended for potato late blight protection.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- two sprays of the fungicide at 2.4 kg a.i. ha-1e0
- Outcome
- good late blight protection programmee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two sprays of the fungicide at 2.4 kg a.i. ha-1 are necessary for a good late blight protection programme in potato”
Claim · model-written summary
The two spray regime increased net returns by US$ 1947 to 3327 ha-1.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- This spray regimee0
- Outcome
- net returnse0
- Direction
- increasese0
- Value
- US$ 1947 to 3327 ha-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This spray regime resulted to increases in net returns of US$ 1947 to 3327 ha-1.”
t0“potato”
Claim · model-written summary
Higher fungicide rates or frequencies did not necessarily improve economic benefits.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- high rates or frequencies of fungicide applicationse0
- Outcome
- economic benefitse0
- Direction
- do not necessarily lead to bettere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high rates or frequencies of fungicide applications do not necessarily lead to better economic benefits”
t0“potato”
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See all 191 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.