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Funded Project |
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Funding Program:
IPM Enhancement Grants |
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Project Title:
Reassessment of Nematode Thresholds for Agronomic Crops in the Southeast |
Project Directors (PDs):
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Lead State: VA Lead Organization: Virginia Polytechnic Institute and State University |
| Undesignated Funding: $30,000 |
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Start Date: Mar-01-2018 End Date: Feb-28-2019 |
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Pests Involved: Nematodes |
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Site/Commodity: Agronomic crops in the southeast |
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Summary:
Virginia growers and commodity boards have indicated crop parasitic nematodes are a major yield-limiting factor, especially in cotton, peanut, corn, and soybean cropping systems. The situation is similar throughout the southeastern U.S. A recent survey of nematode populations in Virginia cropping systems has identified high levels of parasitic nematodes associated with agronomic crops, but currently utilized economic thresholds were developed decades ago and may not be directly applicable to the current cropping situation. As varieties have improved and the cost of nematicides has increased, the economics of nematode management and damage thresholds for control need to be reassessed. This project will quantify levels of crop damage and yield loss caused by different levels of parasitic nematodes, examine the economics of different nematode management tactics based on damage thresholds, and develop and disseminate revised nematode thresholds and IPM recommendations to growers through extension activities. This will result in increased grower, consultant, and extension educator awareness of damage caused by nematodes and facilitate adoption of threshold-based IPM approaches to control of nematodes in agronomic crops. Ultimately this will decrease crop losses due to parasitic nematodes, decrease unnecessary nematicide or fumigant use for nematode control, increase return on investment when nematicides are used, increase the profitability of agronomic crop production, and decrease negative environmental impacts associated with nematode management.
Objectives: OUTPUTS 1. Quantify levels of crop damage and yield loss caused by different levels of parasitic nematodes. This data will be generated through on-farm research with cooperating growers and consultants. 2. Examine economics of different nematode management tactics based on nematode damage thresholds. Utilizing data from the output described above as well as nematode control efficacy data generated from other studies, return on investment for different control methods (e.g. in-furrow nematicides) will be calculated for different crop-nematode population combinations. 3. Develop and disseminate revised nematode thresholds and management recommendations to growers through extension activities (publications and presentations). After one year, current nematode thresholds will be revised based on the outputs described above, and we will continue to refine them as additional years of data are generated. OUTCOMES 1. Increased grower, consultant, and Extension educator awareness of levels of crop damage caused by different types of parasitic nematodes. 2. Increased grower, consultant, and Extension educator knowledge of the profitability of different nematode management tactics in specific field situations. 3. Increased grower, consultant, and Extension educator awareness and adoption of IPM for nematode control in agronomic crops. |
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Final Report: |
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Outputs *On farm field experiments were conducted to quantify yield loss due to different levels of economically important crop parasitic nematodes. *Extension publications on crop nematode sampling and threshold-based management were published through Virginia Cooperative Extension. *Nematode diagnostic services were provided free of charge to agronomic crop producers in Virginia in order to increase awareness of nematode problems and adoption of IPM practices for nematode control. *Results of on-farm research and nematode diagnostics activities were presented to growers, crop consultants, and Extension educators at several field days and crop production conferences in Virginia. *Additional funding was secured from commodity boards to continue on-farm research and nematode diagnostic services. |
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Outcomes *Grower awareness of crop nematode problems in their fields increased from 2017 to 2018. *The number of growers submitting nematode diagnostic samples and basing management decisions on nematode thresholds increased between 2017 and 2019. *Growers reported an increased adoption of integrated management approaches to nematode control. |
Report Appendices
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