Abstract
The effect of olive (Olea europaea) stem extract (OSE) on the viability of conidia of Verticillium dahliae, the causal agent of Verticillium wilt of olive (VWO), is not yet well understood. Thus, the aim of this study was to determine the influence of the olive genotype (cultivar resistance) and the interaction between olive cultivars and biocontrol treatments on the effect of OSE on conidial germination of V. dahliae by in vitro sensitivity tests. To this end, OSE from cultivars Frantoio, Arbequina, and Picual, respectively tolerant, moderately susceptible, and highly susceptible to V. dahliae, were tested alone or after treatments with biological control agents (BCAs) and commercial products efficient at reducing the progress of VWO. Aureobasidium pullulans strain AP08, Phoma sp. strain ColPat-375, and Bacillus amyloliquefaciens strain PAB-24 were considered as BCAs. Aluminium lignosulfonate (IDAI Brotaverd®), copper phosphite (Phoscuprico®), potassium phosphite (Naturfos®), and salicylic acid were selected as commercial products. Our results indicate that the influence of biological treatments against the pathogen depends on the genotype, since the higher the resistance of the cultivar, the lower the effect of the treatments on the ability of OSE to inhibit the germination of conidia. In ‘Picual’, the BCA B. amyloliquefaciens PAB024 and copper phosphite were the most effective treatments in inhibiting conidia germination by the OSE. This work represents a first approach to elucidate the role of cultivar and biological treatments in modifying the effect on the pathogen of the endosphere content of olive plants.
Highlights
Published: 20 February 2022Verticillium wilt of olive (Olea europaea subsp. europaea; VWO) causes high levels of tree mortality and reduces fruit yield in most olive-growing areas worldwide and is considered the main limiting factor of olive in Mediterranean-type climate regions [1,2,3].In southern Spain, the disease is one of the major concerns for olive growers
This work represents a first approach to elucidate the role of cultivar and biological treatments in modifying the effect of the endosphere contents on the pathogen in olive plants
Our results indicate that the influence of biological treatments against the pathogen depends on the genotype, since the greater the resistance of the cultivar, the lower the influence of the treatments on the ability of olive stem extract (OSE) to inhibit conidia germination
Summary
Published: 20 February 2022Verticillium wilt of olive (Olea europaea subsp. europaea; VWO) causes high levels of tree mortality and reduces fruit yield in most olive-growing areas worldwide and is considered the main limiting factor of olive in Mediterranean-type climate regions [1,2,3].In southern Spain, the disease is one of the major concerns for olive growers. Europaea; VWO) causes high levels of tree mortality and reduces fruit yield in most olive-growing areas worldwide and is considered the main limiting factor of olive in Mediterranean-type climate regions [1,2,3]. The global disease incidence in this region is around 0.5%, it can reach values higher than 20%, together with high levels of disease severity and tree mortality in certain areas across the Guadalquivir valley. The causal agent of VWO is the hemibiotrophic soil-borne fungus Verticillium dahliae, from which two populations, defoliating (D) and nondefoliating (ND) pathotypes, have been identified in olive, with D pathotype causing the most severe damage [1,4]. The xylem vessels of the infected plants are colonized by the pathogen
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