Sensitivity of two sugarcane rust fungi to fungicides in urediniospore germination and detached leaf bioassays
Management of brown (Puccinia melanocephala) and orange (Puccinia kuehnii) rust of sugarcane in Florida primarily relies on fungicide applications. Using two different in vitro bioassays, we evaluated the efficacy of five fungicides registered for control of these diseases. Inhibition of P. kuehnii and P. melanocephala urediniospore germination varied from 96 to 100% at 0.01–10 μg per ml of pyraclostrobin and fluxapyroxad + pyraclostrobin. However, only 48% of the P. kuehnii spores were inhibited at 10 μg per ml of fluxapyroxad. Capacity to inhibit sugarcane infection and rust uredinia formation was tested with a detached leaf bioassay where fungicides were applied at different times with respect to inoculation with P. kuehnii or P. melanocephala. When fungicides were sprayed immediately after inoculation of leaf fragments, uredinia formation of P. melanocephala and P. kuehnii was suppressed at 99–100% regardless of the fungicide, except for metconazole (36–50% reduction). Uredinia formation of P. kuehnii was also nil when all fungicides (except metconazole) were sprayed 1 or 2 days prior to inoculation. However, maximum reduction in uredinia formation was 82% and 48% when leaves were sprayed with fungicides one or two days after inoculation, respectively. Therefore, these fungicides are more efficient in preventive than curative management of sugarcane orange rust.
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Subjects: | H20 - Maladies des plantes, H50 - Troubles divers des plantes, Puccinia melanocephala, Puccinia, fongicide, efficacité, Puccinia kuehnii, http://aims.fao.org/aos/agrovoc/c_27331, http://aims.fao.org/aos/agrovoc/c_6354, http://aims.fao.org/aos/agrovoc/c_3146, http://aims.fao.org/aos/agrovoc/c_2491, http://aims.fao.org/aos/agrovoc/c_ac7b37ec, http://aims.fao.org/aos/agrovoc/c_2985, http://aims.fao.org/aos/agrovoc/c_8114, |
Online Access: | http://agritrop.cirad.fr/594369/ http://agritrop.cirad.fr/594369/1/SC%20Rust%20S%20to%20fungicides_Chaulagain%20et%20al_Crop%20Protec%202019.pdf |
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dig-cirad-fr-5943692024-01-29T02:27:15Z http://agritrop.cirad.fr/594369/ http://agritrop.cirad.fr/594369/ Sensitivity of two sugarcane rust fungi to fungicides in urediniospore germination and detached leaf bioassays. Chaulagain Bhim, Dufault Nicholas, Raid Richard Neil, Rott Philippe. 2019. Crop Protection, 117 : 86-93.https://doi.org/10.1016/j.cropro.2018.11.014 <https://doi.org/10.1016/j.cropro.2018.11.014> Sensitivity of two sugarcane rust fungi to fungicides in urediniospore germination and detached leaf bioassays Chaulagain, Bhim Dufault, Nicholas Raid, Richard Neil Rott, Philippe eng 2019 Crop Protection H20 - Maladies des plantes H50 - Troubles divers des plantes Puccinia melanocephala Puccinia fongicide efficacité Puccinia kuehnii http://aims.fao.org/aos/agrovoc/c_27331 http://aims.fao.org/aos/agrovoc/c_6354 http://aims.fao.org/aos/agrovoc/c_3146 http://aims.fao.org/aos/agrovoc/c_2491 http://aims.fao.org/aos/agrovoc/c_ac7b37ec Floride États-Unis d'Amérique http://aims.fao.org/aos/agrovoc/c_2985 http://aims.fao.org/aos/agrovoc/c_8114 Management of brown (Puccinia melanocephala) and orange (Puccinia kuehnii) rust of sugarcane in Florida primarily relies on fungicide applications. Using two different in vitro bioassays, we evaluated the efficacy of five fungicides registered for control of these diseases. Inhibition of P. kuehnii and P. melanocephala urediniospore germination varied from 96 to 100% at 0.01–10 μg per ml of pyraclostrobin and fluxapyroxad + pyraclostrobin. However, only 48% of the P. kuehnii spores were inhibited at 10 μg per ml of fluxapyroxad. Capacity to inhibit sugarcane infection and rust uredinia formation was tested with a detached leaf bioassay where fungicides were applied at different times with respect to inoculation with P. kuehnii or P. melanocephala. When fungicides were sprayed immediately after inoculation of leaf fragments, uredinia formation of P. melanocephala and P. kuehnii was suppressed at 99–100% regardless of the fungicide, except for metconazole (36–50% reduction). Uredinia formation of P. kuehnii was also nil when all fungicides (except metconazole) were sprayed 1 or 2 days prior to inoculation. However, maximum reduction in uredinia formation was 82% and 48% when leaves were sprayed with fungicides one or two days after inoculation, respectively. Therefore, these fungicides are more efficient in preventive than curative management of sugarcane orange rust. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/594369/1/SC%20Rust%20S%20to%20fungicides_Chaulagain%20et%20al_Crop%20Protec%202019.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1016/j.cropro.2018.11.014 10.1016/j.cropro.2018.11.014 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.cropro.2018.11.014 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1016/j.cropro.2018.11.014 |
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H20 - Maladies des plantes H50 - Troubles divers des plantes Puccinia melanocephala Puccinia fongicide efficacité Puccinia kuehnii http://aims.fao.org/aos/agrovoc/c_27331 http://aims.fao.org/aos/agrovoc/c_6354 http://aims.fao.org/aos/agrovoc/c_3146 http://aims.fao.org/aos/agrovoc/c_2491 http://aims.fao.org/aos/agrovoc/c_ac7b37ec http://aims.fao.org/aos/agrovoc/c_2985 http://aims.fao.org/aos/agrovoc/c_8114 H20 - Maladies des plantes H50 - Troubles divers des plantes Puccinia melanocephala Puccinia fongicide efficacité Puccinia kuehnii http://aims.fao.org/aos/agrovoc/c_27331 http://aims.fao.org/aos/agrovoc/c_6354 http://aims.fao.org/aos/agrovoc/c_3146 http://aims.fao.org/aos/agrovoc/c_2491 http://aims.fao.org/aos/agrovoc/c_ac7b37ec http://aims.fao.org/aos/agrovoc/c_2985 http://aims.fao.org/aos/agrovoc/c_8114 |
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H20 - Maladies des plantes H50 - Troubles divers des plantes Puccinia melanocephala Puccinia fongicide efficacité Puccinia kuehnii http://aims.fao.org/aos/agrovoc/c_27331 http://aims.fao.org/aos/agrovoc/c_6354 http://aims.fao.org/aos/agrovoc/c_3146 http://aims.fao.org/aos/agrovoc/c_2491 http://aims.fao.org/aos/agrovoc/c_ac7b37ec http://aims.fao.org/aos/agrovoc/c_2985 http://aims.fao.org/aos/agrovoc/c_8114 H20 - Maladies des plantes H50 - Troubles divers des plantes Puccinia melanocephala Puccinia fongicide efficacité Puccinia kuehnii http://aims.fao.org/aos/agrovoc/c_27331 http://aims.fao.org/aos/agrovoc/c_6354 http://aims.fao.org/aos/agrovoc/c_3146 http://aims.fao.org/aos/agrovoc/c_2491 http://aims.fao.org/aos/agrovoc/c_ac7b37ec http://aims.fao.org/aos/agrovoc/c_2985 http://aims.fao.org/aos/agrovoc/c_8114 Chaulagain, Bhim Dufault, Nicholas Raid, Richard Neil Rott, Philippe Sensitivity of two sugarcane rust fungi to fungicides in urediniospore germination and detached leaf bioassays |
description |
Management of brown (Puccinia melanocephala) and orange (Puccinia kuehnii) rust of sugarcane in Florida primarily relies on fungicide applications. Using two different in vitro bioassays, we evaluated the efficacy of five fungicides registered for control of these diseases. Inhibition of P. kuehnii and P. melanocephala urediniospore germination varied from 96 to 100% at 0.01–10 μg per ml of pyraclostrobin and fluxapyroxad + pyraclostrobin. However, only 48% of the P. kuehnii spores were inhibited at 10 μg per ml of fluxapyroxad. Capacity to inhibit sugarcane infection and rust uredinia formation was tested with a detached leaf bioassay where fungicides were applied at different times with respect to inoculation with P. kuehnii or P. melanocephala. When fungicides were sprayed immediately after inoculation of leaf fragments, uredinia formation of P. melanocephala and P. kuehnii was suppressed at 99–100% regardless of the fungicide, except for metconazole (36–50% reduction). Uredinia formation of P. kuehnii was also nil when all fungicides (except metconazole) were sprayed 1 or 2 days prior to inoculation. However, maximum reduction in uredinia formation was 82% and 48% when leaves were sprayed with fungicides one or two days after inoculation, respectively. Therefore, these fungicides are more efficient in preventive than curative management of sugarcane orange rust. |
format |
article |
topic_facet |
H20 - Maladies des plantes H50 - Troubles divers des plantes Puccinia melanocephala Puccinia fongicide efficacité Puccinia kuehnii http://aims.fao.org/aos/agrovoc/c_27331 http://aims.fao.org/aos/agrovoc/c_6354 http://aims.fao.org/aos/agrovoc/c_3146 http://aims.fao.org/aos/agrovoc/c_2491 http://aims.fao.org/aos/agrovoc/c_ac7b37ec http://aims.fao.org/aos/agrovoc/c_2985 http://aims.fao.org/aos/agrovoc/c_8114 |
author |
Chaulagain, Bhim Dufault, Nicholas Raid, Richard Neil Rott, Philippe |
author_facet |
Chaulagain, Bhim Dufault, Nicholas Raid, Richard Neil Rott, Philippe |
author_sort |
Chaulagain, Bhim |
title |
Sensitivity of two sugarcane rust fungi to fungicides in urediniospore germination and detached leaf bioassays |
title_short |
Sensitivity of two sugarcane rust fungi to fungicides in urediniospore germination and detached leaf bioassays |
title_full |
Sensitivity of two sugarcane rust fungi to fungicides in urediniospore germination and detached leaf bioassays |
title_fullStr |
Sensitivity of two sugarcane rust fungi to fungicides in urediniospore germination and detached leaf bioassays |
title_full_unstemmed |
Sensitivity of two sugarcane rust fungi to fungicides in urediniospore germination and detached leaf bioassays |
title_sort |
sensitivity of two sugarcane rust fungi to fungicides in urediniospore germination and detached leaf bioassays |
url |
http://agritrop.cirad.fr/594369/ http://agritrop.cirad.fr/594369/1/SC%20Rust%20S%20to%20fungicides_Chaulagain%20et%20al_Crop%20Protec%202019.pdf |
work_keys_str_mv |
AT chaulagainbhim sensitivityoftwosugarcanerustfungitofungicidesinurediniosporegerminationanddetachedleafbioassays AT dufaultnicholas sensitivityoftwosugarcanerustfungitofungicidesinurediniosporegerminationanddetachedleafbioassays AT raidrichardneil sensitivityoftwosugarcanerustfungitofungicidesinurediniosporegerminationanddetachedleafbioassays AT rottphilippe sensitivityoftwosugarcanerustfungitofungicidesinurediniosporegerminationanddetachedleafbioassays |
_version_ |
1792499861993553920 |