Tomato late blight vs early blight12/8/2023 Testing disease response and horticultural type in SLS/EB/LB resistant lines and hybrids OUTCOME: This objective generates data & seed for other objectives. Combine genetic controls of the three major defoliating diseases of tomato, SLS, LB & EB in high quality tomato lines OUTCOME: Development of resistant tomato lines with good type and adaptation to the NE tomato growing regions. The objectives are: 1 & 2) Combine SLS, LB and EB resistance in elite tomato lines, testing disease response and horticultural 3 a & b) Determine efficacy of four fungicide treatments for disease control with & without genetic resistance (NY) then compare the best timings on lines with & without EB/LB/SLS resistances (NY, VA and NC) 4&5) Test EB/LB/SLS lines and hybrids in multiple sites (NY, WV) for control and horticultural properties. We address strobilurin resistance by selecting appropriate replacements, scheduling use (TOM-CAST), and assess how reduced sprays and plant resistance can improve control and reduce grower costs. This project unites breeders, pathologists, horticulturists, and conventional & organic growers in 4 states and two regions to meet priorities by developing LB/EB/SLS resistant tomatoes (adding SLS resistance to a LB/EB resistant line), and testing disease response of these lines with reduced sprays of low EIQ fungicides. Another priority is strobilurin resistance found in EB isolates in NY, NC. These diseases are high priorities in all NE states to the Southern region. Goals / Objectives This project targets improved control, with reduced pesticide load, of early blight (EB), late blight (LB), and Septoria leaf spot (SLS), in tomato in eastern US. The proper use of SLS/EB/LB hybrids in the IPM system will reduce use of chemical controls, shift to use of low EIQ chemicals, reduce growers costs of production, reduce risk associated with pesticide usage for agricultural workers and the environment, as well as risk of pesticide residue for consumers. The use of a system covering all three defoliating diseases will be more manageable rather that using separate IPM programs for each disease. This LB/EB/SLS control system would result in use of the lowest number of fungicidal sprays/season and the use of low EIQ fungicides, minimizing EIQ per season. Combined, this project will encourage "science-based pest management that safeguards human health & the environment" because it provides information and materials which create a coordinated strategy for controlling these three diseases. homozygous for SLS will inform the seed companies of how the SLS resistance must be present in their hybrids (homozygous or heterozygous), providing growers with the best hybrids. ![]() Information on the relative control achieved with the best fungicide program and hybrids heterozygous vs. ![]() The EB/LB/SLS tomato lines produced will enable seed companies to release triple resistant hybrids. This information will assist growers to select effective fungicides with lowest EIQs and use TOM-CAST. The results of trialing with pesticides, in multiple regions that include the strobilurin-resistant EB variant will be immediately applicable with current EB/LB resistant varieties. Therefore, this project also has overarching impacts. Although the is separated into 5 objectives, this project has one overarching objective: the coordinated control of EB/LB/SLS through the use of resistance to each of the diseases combined with a IPM strategy using minimal sprays of the lowest EIQ compounds. The 5 objectives are: Combine SLS, LB and EB resistance in elite tomato lines, Testing disease response and horticultural Determine efficacy of four fungicide treatments for disease control with & without genetic resistance (NY) Compare the best timings on lines with & without EB/LB/SLS resistances in NY, VA and NC Test EB/LB/SLS lines and hybrids in multiple sites for control and horticultural properties. This project unites breeders, pathologists, horticulturists, and conventional & organic growers in 4 states and 2 regions to meet priorities by developing LB/EB/SLS resistant tomatoes and testing disease response of these lines with reduced sprays of low EIQ fungicides. Another priority is strobilurin resistance in EB isolates in NY, NC. Excessive spraying increases growers costs, risk to the environment and rural community due to increased compound release, and risk for consumers due to risks of residuals. Many fungicide sprays are used in these regions to protect yields & quality. Non Technical Summary This project targets improved control, with reduced pesticide load, of early blight (EB), late blight (LB), and Septoria leaf spot (SLS) in tomatoes in the eastern US.
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