Journal of Peanut Science

In this study, the control effects of three bacterial wilt-resistant peanut varieties combining with seed coatings and bio-control agents on the soil-borne diseases were investigated. Observations and analyses were conducted on the seedling emergence rate, disease incidence rate at initial and mid-flowering stages, biological traits of mature plants, and pod yield per plot. The results showed that the average seedling emergence rate of peanuts ranged from 83.33% to 99.17%. The incidence of soil-borne diseases in the initial flowering stage of peanuts ranged from 0.00% to 2.73%, with the lowest disease incidence in the Trichoderma treatment and the highest in the control, with no significant difference between treatments. The disease incidence in the mid-flowering stage ranged from 2.92% to 14.17%, with the lowest disease incidence in the seed coating of Liangdun treatment and the highest in the control, with no significant difference between treatments. Among the varieties, the disease incidence of variety Kanghuang1 was the lowest, and that of variety Fuhua3 was the highest, and the variety Fuhua3 showed significant differences in disease incidence comparing to other varieties. The compound bacterium agent treatment significantly promoted peanut main stem height and lateral branch length, while increasing pod mass and kernel mass per plant. The Trichoderma treatment enhanced the fruit-bearing branch rate, total number of pods, full-fruit rate, double-kernel pod rate, 100-pod mass, 100-kernel mass, and kernel-fruit ratio. In contrast, the seed coating Liangdun treatment reduced 100-pod mass and 100-kernel mass, significantly decreased the full-fruit rate and double-kernel pod rate, and resulted in lower pod mass and kernel mass per plant. All treatments increased peanut pod yield compared to the control treatment. Seed coating Liangdun achieved the highest pod yield as 2 505.43 kg/ha, showing significant differences with other treatments. Among varieties, Kanghuang1 exhibited the highest pod yield as 2 651.0 kg/ha, with significant differences comparing to other varieties. Among the two treatment combinations, the top three yield combinations were the variety Kanghuang1 treated with seed coating Liangdun, compound bacterium agent, and Trichoderma, with yields of 3 721.8, 2 887.22 and 2 383.46 kg/ha, respectively. In conclusion, Kanghuang1 was identified as a soil-borne disease-resistant variety among the three peanut bacterial wilt-resistant varieties, which demonstrated compatibility with multiple seed treatments, with the seed coating Liangdun showing the most effective synergy.