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ARS Home » Southeast Area » Tifton, Georgia » Crop Genetics and Breeding Research » Research » Publications at this Location » Publication #403806
Research Project: Development of High-Yielding, High-Oleic Peanut Cultivars or Germplasm with Tolerance to Biotic and Abiotic Stresses

Location: Crop Genetics and Breeding Research

Title: Development of peanut cultivars with resistance to leaf spot and their evaluation under different production systems

Author
item Holbrook, Carl - Corley
item Lamb, Marshall
item OZIAS-AKINS, P - University Of Georgia
item CHU, Y - University Of Georgia
item CULBREATH, A - University Of Georgia
item BRENNEMAN, T - University Of Georgia

Submitted to: American Peanut Research and Education Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 4/15/2023
Publication Date: N/A
Citation: N/A

Interpretive Summary: not required.

Technical Abstract: Late leaf spot (LLS) caused by Northopassalora personata, is a foliar disease that plagues peanut production worldwide. Chemical control is expensive, sometimes inaccessible and can be difficult to apply. One effective solution to control this disease would be the development of resistant cultivars. Three well-defined segments of wild Arachis cardenasii chromosomes confer excellent resistance to late leaf spot. We have been using MAS in an accelerated backcross breeding scheme to develop leaf spot resistant cultivars. We began replicated yield trials with selections from the first backcross in 2019. We added selections from the second backcross in 2020. We continued testing these selections along with common check cultivars in 2021 and 2022. All genotypes are tested under three production systems. We used a full fungicide regime (five sprays) in one system and no fungicide in another. For the third system we used one application of Convoy at 60 days after planting to provide a moderate level of control for white mold. Leaf spot severity in all years confirmed that the backcross selections have excellent resistance to late leaf spot. Several leaf spot resistant selections exhibited excellent yield and grade when grown under reduced sprayed conditions. The highest net revenue per acre was obtained by growing leaf spot resistance genotypes under reduced or non-sprayed conditions. All of these genotype/reduced spray production combinations resulted in higher net revenue per acre in comparison to Georgia-06G under a full fungicide regime. We expect that growers will be able to use these cultivars to increase their profitability.