Root-lesion Nematodes, Potassium Deficiency, and Prior Cover Crops as Factors in Apple Replant Disease

Merwin, Ian A.; Stiles, Warren C.

doi:10.21273/jashs.114.5.724

Cited by 27 publications

(1 citation statement)

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“…Replant symptoms are nonspecific, affect multiple genera of fruit trees, and often correlate with pathogenic generalists such as root-lesion nematodes and Fusarium spp. [ 6 , 7 , 8 ]. Biotic factors such as microorganisms contribute to RS, which is supported by studies where Prunus persica (peach tree) biomass is higher in autoclaved soils than in non-autoclaved soils [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

A Microbiological Approach to Alleviate Soil Replant Syndrome in Peaches

et al. 2023

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Replant syndrome (RS) is a global problem characterized by reduced growth, production life, and yields of tree fruit/nut orchards. RS etiology is unclear, but repeated monoculture plantings are thought to develop a pathogenic soil microbiome. This study aimed to evaluate a biological approach that could reduce RS in peach (Prunus persica) orchards by developing a healthy soil bacteriome. Soil disinfection via autoclave followed by cover cropping and cover crop incorporation was found to distinctly alter the peach soil bacteriome but did not affect the RS etiology of RS-susceptible ‘Lovell’ peach seedlings. In contrast, non-autoclaved soil followed by cover cropping and incorporation altered the soil bacteriome to a lesser degree than autoclaving but induced significant peach growth. Non-autoclaved and autoclaved soil bacteriomes were compared to highlight bacterial taxa promoted by soil disinfection prior to growing peaches. Differential abundance shows a loss of potentially beneficial bacteria due to soil disinfection. The treatment with the highest peach biomass was non-autoclaved soil with a cover crop history of alfalfa, corn, and tomato. Beneficial bacterial species that were cultivated exclusively in the peach rhizosphere of non-autoclaved soils with a cover crop history were Paenibacillus castaneae and Bellilinea caldifistulae. In summary, the non-autoclaved soils show continuous enhancement of beneficial bacteria at each cropping phase, culminating in an enriched rhizosphere which may help alleviate RS in peaches.

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