Abstract
Late blight of potato which is caused by Phytophthora infestans, (Mont) de Bary is an important disease of potatoes (Solanum tubersolum) and is a prevalent disease in all potato producing areas of Ethiopia. A field experiment was conducted for two consecutive years (2016 and 2017) under the main rainy season to develop integrated management options for late blight disease of potato at Bursa District, Sidama Zone, SNNPRS, Ethiopia. Two improved varieties having different level of resistance, four registered fungicides, and two unsprayed plots (control) were arranged in a factorial randomized complete block design with three replications. The result showed that all fungicides significantly reduced the infection of late blight as compared to the unsprayed treatments at both seasons. Two way interaction of variety by fungicide showed significant difference on controlling disease severity and increasing tuber yield in 2017. Fungicides Matco (Metalaxyl-8%+Mancozeb-64%) and Boss (Metalaxyl+Mancozeb) 72% WP significantly reduced severity of the disease as compared to Bacticide (Copper Hydroxide) and Mancozeb (Diathane-M45) in 2017 cropping season. Whereas in 2016 the disease pressure was low as the result there was no significant difference between fungicides. Depending on the fungicides efficacy and varietal reactions to the disease (21.82 to 30.47 t ha -1 ) and (20 to 36.84 t ha -1 ) tuber yield were obtained from the sprayed plot in 2016 and 2017, respectively. On the other hand from unsprayed plots, 10.63-18.63 t ha -1 and 8.8-17.4 t ha -1 tuber yield was obtained in 2016 and 2017 cropping seasons respectively. The mean yield advantage of fungicide sprayed plots for both varieties was 62% as compared to the unsprayed ones. The study confirmed that host resistance level and fungicide efficacy played an important role in host-pathogen-fungicide interaction to reduce the severity of late blight on potato. Therefore, it was confirmed that the combined effects of growing moderately resistant cultivars with the application of fungicides Matco at two spray frequency in 10 day intervals reduced the yield loss and damage caused by late blight even under high late blight pressure.
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Claims 11
Claim · model-written summary
Fungicides significantly reduced potato late blight infection versus unsprayed plots in both seasons.
- Taxon
- potato
Solanum tuberosume1 - Treatment
- fungicidese0
- Interactor
- Phytophthora infestans
Phytophthora infestanse1pathogene0 - Outcome
- infection of late blighte0
- Direction
- reducede0
- Comparator
- unsprayed treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all fungicides significantly reduced the infection of late blight as compared to the unsprayed treatments at both seasons”
e1“Late blight of potato which is caused by Phytophthora infestans”
Claim · model-written summary
The variety by fungicide interaction differed significantly for disease severity control in 2017.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- variety by fungicidee0
- Outcome
- disease severitye0
- Direction
- significant differencee0
- Qualifier
- 2017e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two way interaction of variety by fungicide showed significant difference on controlling disease severity and increasing tuber yield in 2017”
e1“Late blight of potato which is caused by Phytophthora infestans”
Claim · model-written summary
The variety by fungicide interaction differed significantly for tuber yield in 2017.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- variety by fungicidee0
- Outcome
- tuber yielde0
- Direction
- increasinge0
- Qualifier
- 2017e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two way interaction of variety by fungicide showed significant difference on controlling disease severity and increasing tuber yield in 2017”
e1“Late blight of potato which is caused by Phytophthora infestans”
Claim · model-written summary
Matco and Boss reduced late blight severity relative to Bacticide and Mancozeb in 2017.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- Matco (Metalaxyl-8%+Mancozeb-64%) and Boss (Metalaxyl+Mancozeb) 72% WPe0
- Outcome
- severity of the diseasee0
- Direction
- reducede0
- Qualifier
- 2017 cropping seasone0
- Comparator
- Bacticide (Copper Hydroxide) and Mancozeb (Diathane-M45)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fungicides Matco (Metalaxyl-8%+Mancozeb-64%) and Boss (Metalaxyl+Mancozeb) 72% WP significantly reduced severity of the disease as compared to Bacticide (Copper Hydroxide) and Mancozeb (Diathane-M45) in 2017 cropping season”
e1“Late blight of potato which is caused by Phytophthora infestans”
Claim · model-written summary
Fungicides did not differ significantly in 2016 under low disease pressure.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- fungicidese0
- Outcome
- disease pressuree0
- Direction
- no significant differencee0
- Qualifier
- 2016e0
- Comparator
- fungicidese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 2016 the disease pressure was low as the result there was no significant difference between fungicides”
e1“Late blight of potato which is caused by Phytophthora infestans”
Claim · model-written summary
Sprayed plots yielded 21.82 to 30.47 t ha -1 in 2016.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- sprayed plote0
- Outcome
- tuber yielde0
- Value
- 21.82 to 30.47 t ha -1e0
- Qualifier
- 2016e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“(21.82 to 30.47 t ha -1 ) and (20 to 36.84 t ha -1 ) tuber yield were obtained from the sprayed plot in 2016 and 2017”
e1“Late blight of potato which is caused by Phytophthora infestans”
Claim · model-written summary
Sprayed plots yielded 20 to 36.84 t ha -1 in 2017.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- sprayed plote0
- Outcome
- tuber yielde0
- Value
- 20 to 36.84 t ha -1e0
- Qualifier
- 2017e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“(21.82 to 30.47 t ha -1 ) and (20 to 36.84 t ha -1 ) tuber yield were obtained from the sprayed plot in 2016 and 2017”
e1“Late blight of potato which is caused by Phytophthora infestans”
Claim · model-written summary
Unsprayed plots yielded 10.63-18.63 t ha -1 in 2016.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- unsprayed plotse0
- Outcome
- tuber yielde0
- Value
- 10.63-18.63 t ha -1e0
- Qualifier
- 2016e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“from unsprayed plots, 10.63-18.63 t ha -1 and 8.8-17.4 t ha -1 tuber yield was obtained in 2016 and 2017 cropping seasons respectively”
e1“Late blight of potato which is caused by Phytophthora infestans”
Claim · model-written summary
Unsprayed plots yielded 8.8-17.4 t ha -1 in 2017.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- unsprayed plotse0
- Outcome
- tuber yielde0
- Value
- 8.8-17.4 t ha -1e0
- Qualifier
- 2017e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“from unsprayed plots, 10.63-18.63 t ha -1 and 8.8-17.4 t ha -1 tuber yield was obtained in 2016 and 2017 cropping seasons respectively”
e1“Late blight of potato which is caused by Phytophthora infestans”
Claim · model-written summary
Fungicide spraying gave a mean yield advantage of 62% over unsprayed plots.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- fungicide sprayed plotse0
- Outcome
- yield advantagee0
- Direction
- advantagee0
- Value
- 62%e0
- Comparator
- unsprayed onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean yield advantage of fungicide sprayed plots for both varieties was 62% as compared to the unsprayed ones”
e1“Late blight of potato which is caused by Phytophthora infestans”
Claim · model-written summary
Moderately resistant cultivars combined with Matco at two sprays 10 days apart reduced late blight yield loss and damage.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- growing moderately resistant cultivars with the application of fungicides Matco at two spray frequency in 10 day intervalse0
- Outcome
- yield loss and damage caused by late blighte0
- Direction
- reducede0
- Qualifier
- high late blight pressuree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the combined effects of growing moderately resistant cultivars with the application of fungicides Matco at two spray frequency in 10 day intervals reduced the yield loss and damage caused by late blight even under high late blight pressure”
e1“Late blight of potato which is caused by Phytophthora infestans”
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