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ARS Home » Pacific West Area » Pullman, Washington » Grain Legume Genetics Physiology Research » Research » Publications at this Location » Publication #327487

Research Project: Genetic Improvement of Cool Season Food Legumes

Location: Grain Legume Genetics Physiology Research

Title: Evaluation of Intego Solo (ethaboxam) for management of metalaxyl-resistant Pythium spp. in chickpea

Author
item Schrodinger, Kurt - University Of Idaho
item Chen, Weidong

Submitted to: Plant Disease Management Reports
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/7/2016
Publication Date: 4/9/2016
Citation: Schrodinger, K., Chen, W. 2016. Evaluation of Intego Solo (ethaboxam) for management of metalaxyl-resistant Pythium spp. in chickpea. Plant Disease Management Reports. 10:FC134.

Interpretive Summary: Pythium damping-off and Pythium root rot, caused by numerous species of Pythium, can be a major limiting factor in the emergence and stand establishment of chickpea. Pythium spp. infect the germinating seed and seedling, often resulting in seed rot and subsequent damping-off in northern Idaho. Currently, seed treatments containing metalaxyl or its isomer mefanoxam are the only chemical treatment options available for management of this disease. Recently, isolates of Pythium ultimum var. ultimum were found in northern Idaho and eastern Washington that are resistant to metalaxyl. Additional seed treatment chemistries effective on metalaxyl-resistant Pythium would be desirable. Intego Solo (ethaboxam, Valent) was evaluated for management of metalaxyl-resistant isolates in inoculated trials in Moscow, ID. The number of emerged chickpea plants was recorded from sampled plot areas. At the end of the growing season, all seed from the trial was harvested, recording the yield and test weight for each plot. As chickpeas are quite sensitive to pre- and post-emergence damping-off, the difference between treatments was striking. Application of Intego Solo significantly improved chickpea emergence. There was also a significant increase in mature plant height and yield when treatments included Intego Solo versus without this chemical. This indicates that application of Intego Solo is beneficial as part of a seed treatment package when seeding chickpea into soils that contain metalaxyl-resistant P. ultimum var. ultimum.

Technical Abstract: Pythium damping-off and Pythium root rot, caused by numerous species of Pythium, can be a major limiting factor in the emergence and stand establishment of chickpea. Pythium spp. infect the germinating seed and seedling, often resulting in seed rot and subsequent damping-off in northern Idaho. Currently, seed treatments containing metalaxyl or its isomer mefanoxam are the only chemical treatment options available for management of this disease. Recently, isolates of Pythium ultimum var. ultimum were found in northern Idaho and eastern Washington that are resistant to metalaxyl. Additional seed treatment chemistries effective on metalaxyl-resistant Pythium would be desirable. Intego Solo (ethaboxam, Valent) was evaluated for management of metalaxyl-resistant isolates in inoculated trials in Moscow, ID. The number of emerged chickpea plants was recorded from sampled plot areas. At the end of the growing season, all seed from the trial was harvested, recording the yield and test weight for each plot. As chickpeas are quite sensitive to pre- and post-emergence damping-off, the difference between treatments was striking. Application of Intego Solo significantly improved chickpea emergence. There was also a significant increase in mature plant height and yield when treatments included Intego Solo versus without this chemical. This indicates that application of Intego Solo is beneficial as part of a seed treatment package when seeding chickpea into soils that contain metalaxyl-resistant P. ultimum var. ultimum.