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United States Department of Agriculture

Agricultural Research Service

Research Project: IMPROVED WATER RESOURCES MANAGEMENT FOR IRRIGATED AGRICULTURE IN THE PACIFIC NORTHWEST Title: Site-Specific Nematode Management for Potatoes in Idaho Using 1,3-Dichloropropene; Experiences and Economics

Authors
item King, Bradley
item Taberna, J -

Submitted to: International Conference on Precision Agriculture Abstracts & Proceedings
Publication Type: Proceedings
Publication Acceptance Date: April 30, 2010
Publication Date: July 19, 2010
Citation: King, B.A., Taberna, J.P. 2010. Site-Specific Nematode Management for Potatoes in Idaho Using 1,3-Dichloropropene; Experiences and Economics. In: Proceedings of the 10th International Conference on Precision Agriculture Abstracts & Proceedings, July 18-21, 2010. Denver, CO. www.icpaonline.org. unpaginated CDROM.

Interpretive Summary: Fumigation for nematode management in irrigated potato production systems of Idaho is widely practiced. From 2002 through 2008, 62 commercial potato fields in eastern Idaho were field tested using geo-referenced grid soil sampling for plant-parasitic nematode population densities. In total, 4,030 grid samples were collected representing nearly 3200 ha of commercial potato production. Collectively, 73% of the grid samples had Columbia Root Knot (CRN) (Meloidogyne chitwoodi) densities below the detectable limit indicating that fumigant nematicide application can potentially be reduced by only treating field areas having detectable CRN densities. Site-specific fumigation is the practice of varying application rate of fumigant based on nematode population density. Field areas not fumigated are treated with less expensive nonfumigant nematicides to reduce risk of crop damage from nematode populations undetected by grid sampling. In 2007, eleven fields in eastern Idaho were grid sampled for CRN densities and fumigated with the nematicide 1,3-dichloropropene on a site-specific basis. The percentage of field area fumigated ranged from zero to 100% for the eleven fields depending upon grid sampled CRN densities. Site-specific fumigation on the eleven fields reduced fumigant nematicide usage by 38,257 L with an associated fumigant chemical cost savings of $122,422 averaging $191/ha for the eleven fields. Based on farm-gate receipts and USDA inspections provided by potato producers, potato tuber yield and quality were not adversely affected using site-specific fumigation technology.

Technical Abstract: Fumigation for nematode management in irrigated potato production systems of Idaho is widely practiced. Spatially uniform fumigation with large scale soil injection equipment is the only labeled application method for 1,3-dichloropropene. Plant-parasitic nematode species exhibit spatially variable population densities that provide an opportunity to practice site-specific fumigation to reduce chemical usage and production costs. From 2002 through 2008, 62 commercial potato fields in eastern Idaho were field tested using geo-referenced grid soil sampling for plant-parasitic nematode population densities. In total, 4,030 grid samples were collected representing nearly 3200 ha of commercial potato production. Collectively, 73% of the grid samples had Columbia Root Knot (CRN) (Meloidogyne chitwoodi) densities below the detectable limit. Site-specific fumigation is the practice of varying application rate of fumigant based on nematode population density. Over the past 3 years, 1200 ha of potato production has been site-specific fumigated for CRN nematode control in eastern Idaho. On average this practice has resulted in a 30% reduction in chemical usage and production cost savings of $180/ha when 1,3-dichloropropene is used as the sole-source of nematode suppression. Further reductions in usage of 1,3-dichloropropene can exceed 50% if used in combination with another nonfumigant nematicide such as oxamyl. This combination approach can have production cost savings that exceed $200/ha. Based on farm-gate receipts and USDA inspections provided by potato producers, potato tuber yield and quality have not been adversely affected using site-specific fumigation technology.

Last Modified: 11/23/2014
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