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Funded Project |
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Funding Program:
Regional IPM Grants (S-RIPM) |
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Project Title:
Integration of peanut genotypes with high levels of field resistance to Tomato spotted wilt virus with other spotted wilt management tactics |
Project Directors (PDs):
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Lead State: GA Lead Organization: University of Georgia |
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Cooperating State(s):
Alabama, Florida |
| Extension Funding: $37,013 |
| Research Funding: $91,487 |
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Start Date: Sep-01-2012 End Date: Aug-31-2015 |
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Summary:
Thrips transmitted Tomato spotted wilt virus (TSWV) is a major constraint to peanut production in the southeast. TSWV infection induces spotted wilt in peanut. Planting cultivars that display field resistance is the most important management option. However, these cultivars only display moderate levels of field resistance and resistance is introgressed only in step-wise increments. The first-generation TSWV resistant cultivars (1990s) exhibited more resistance than susceptible cultivars. Second-generation TSWV resistant cultivars (2000-2010) exhibited more resistance than the previous generation. Second-generation cultivars still display TSWV symptoms upon infection and accumulate virus titer. However, in conjunction with insecticides such as Temik and Thimet and cultural tactics, growers have been able to achieve satisfactory levels of spotted wilt control. Recently, the production of Temik was halted and its usage will be phased out by 2018, Thimet will likely follow soon. With this impending loss, it is necessary to identify alternatives. Research has indicated that a number of new insecticides have been effective in suppressing thrips but not TSWV. But, with high levels of resistance in the second- and third-generation (2010-2012) TSWV resistant cultivars, usage of Temik and Thimet may not be critical. The goal of this proposal is to examine the compatibility of newly released TSWV resistant peanut cultivars in the presence of newer insecticides and with cultural tactics. This approach will allow peanut growers to transition from using old broad-spectrum insecticides while maintaining sustainability and profitability. Also, increased level of TSWV resistance in newly released cultivars could improve sustainability in organic production.
Objectives: Objective 1. Evaluate the susceptibility of new TSWV-resistant genotypes in the greenhouse and laboratory. Objective 2. Examine the susceptibility of newly released TSWV-resistant cultivars under field conditions with new insecticides Objective 3. Assess the compatibility of third generation TSWV-resistant cultivars with cultural practices. Extension Objective: Objective 4. Demonstrate the usefulness of integrating newly developed peanut cultivars with chemical and cultural tactics |
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