Abstract
ABSTRACT The use of host diversity as a tool for management of potato late blight has not been viewed as promising in the past. But the increasing importance of late blight internationally has brought new consideration to all potential management tools. We studied the effect of host diversity on epidemics of potato late blight in Oregon, where there was little outside inoculum. The experimental system consisted of susceptible potato cv. Red LaSoda and a highly resistant breeding selection, inoculated with local isolates of US-8 Phytophthora infestans. Potatoes were grown in single-genotype plots and also in a mixture of 10 susceptible and 26 resistant potato plants. Half of the plots received inoculation evenly throughout the plot (general inoculation) and half received an equal quantity of inoculum in only one corner of the plot (focal inoculation). The area under the disease progress curve (AUDPC) was greater in single genotype stands of susceptible cv. Red LaSoda inoculated throughout the plot than with stands inoculated in one focus. The host-diversity effect on foliar late blight was significant in both years of the investigation; the AUDPC was reduced by an average of 37% in 1997 and 36% in 1998, compared with the mean disease level for the potato genotypes grown separately. Though the evidence for influence of inoculum pattern on host-diversity effects was weak (P = 0.15), in both years there was a trend toward greater host-diversity effects for general inoculation. Statistical significance of host-diversity effects on tuber yield and blight were found only in one of the two years. In that year, tuber yield from both the resistant and susceptible cultivar was increased in mixtures compared with single genotype stands and tuber blight was decreased in mixtures for susceptible cv. Red LaSoda.
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Claims 5
Claim · model-written summary
A mixture of susceptible and resistant potato plants reduced AUDPC of late blight by 37% in 1997 and 36% in 1998 relative to genotypes grown separately.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- a mixture of 10 susceptible and 26 resistant potato plantse3
- Interactor
- Phytophthora infestans
Phytophthora infestanse2pathogen - Outcome
- AUDPCe6
- Direction
- reducede6
- Value
- 37% in 1997 and 36% in 1998e6
- Comparator
- potato genotypes grown separatelye6
- Setting
- Oregone1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Host Diversity Can Reduce Potato Late Blight Severity”
e1“We studied the effect of host diversity on epidemics of potato late blight in Oregon”
e2“inoculated with local isolates of US-8 Phytophthora infestans”
e3“a mixture of 10 susceptible and 26 resistant potato plants”
e6“The host-diversity effect on foliar late blight was significant in both years of the investigation; the AUDPC was reduced by an average of 37% in 1997 and 36% in 1998, compared with the mean disease level for the potato genotypes grown separately.”
Claim · model-written summary
General inoculation gave a non-significant trend toward greater host-diversity effects than focal inoculation.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- general inoculatione7
- Interactor
- Phytophthora infestansPhytophthora infestanse2pathogen
- Outcome
- host-diversity effectse7
- Direction
- greatere7
- Qualifier
- weak (P = 0.15)e7
- Comparator
- focal inoculatione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Host Diversity Can Reduce Potato Late Blight Severity”
e2“inoculated with local isolates of US-8 Phytophthora infestans”
e4“in only one corner of the plot (focal inoculation)”
e7“Though the evidence for influence of inoculum pattern on host-diversity effects was weak (P = 0.15), in both years there was a trend toward greater host-diversity effects for general inoculation.”
Claim · model-written summary
In one of the two years, tuber yield of both cultivars was increased in mixtures compared with single genotype stands.
- Taxon
- potatoSolanum tuberosumt0
- Material
- resistant and susceptible cultivare1
- Treatment
- mixturese1
- Outcome
- tuber yielde1
- Direction
- increasede1
- Qualifier
- only in one of the two yearse0
- Comparator
- single genotype standse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Host Diversity Can Reduce Potato Late Blight Severity”
e0“Statistical significance of host-diversity effects on tuber yield and blight were found only in one of the two years”
e1“In that year, tuber yield from both the resistant and susceptible cultivar was increased in mixtures compared with single genotype stands and tuber blight was decreased in mixtures for susceptible cv. Red LaSoda”
Claim · model-written summary
In one of the two years, tuber blight of the susceptible cultivar was decreased in mixtures compared with single genotype stands.
- Taxon
- potatoSolanum tuberosumt0
- Material
- susceptible cv. Red LaSodae1
- Treatment
- mixturese1
- Interactor
- Phytophthora infestansPhytophthora infestanse2pathogen
- Outcome
- tuber blighte1
- Direction
- decreasede1
- Qualifier
- only in one of the two yearse0
- Comparator
- single genotype standse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Host Diversity Can Reduce Potato Late Blight Severity”
e2“inoculated with local isolates of US-8 Phytophthora infestans”
e0“Statistical significance of host-diversity effects on tuber yield and blight were found only in one of the two years”
e1“In that year, tuber yield from both the resistant and susceptible cultivar was increased in mixtures compared with single genotype stands and tuber blight was decreased in mixtures for susceptible cv. Red LaSoda”
Claim · model-written summary
AUDPC of late blight was greater in susceptible single-genotype stands inoculated throughout the plot than in stands inoculated in one focus.
- Taxon
- potatoSolanum tuberosumt0
- Material
- susceptible cv. Red LaSodae5
- Treatment
- inoculated throughout the plote5
- Interactor
- Phytophthora infestansPhytophthora infestanse2pathogen
- Outcome
- AUDPCe5
- Direction
- greatere5
- Comparator
- inoculated in one focuse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Host Diversity Can Reduce Potato Late Blight Severity”
e2“inoculated with local isolates of US-8 Phytophthora infestans”
e5“The area under the disease progress curve (AUDPC) was greater in single genotype stands of susceptible cv. Red LaSoda inoculated throughout the plot than with stands inoculated in one focus.”
The same questions in other papers
inoculation · Phytophthora infestans · Solanum tuberosum (potato)Positive and negative results
23 papers in the same direction as this paper · 16 in the opposite direction
- no effect
- no effect
- no effect
36 papers more in this group
See all 40 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.