Abstract
In this work, we investigated the invitro and invivo antifungal activity of aqueous extracts obtained from eight Cistus plant species against the development of Geotrichum citri-aurantii, the causal agent of citrus sour rot. The results demonstrate the invitro effectiveness of all tested Cistus species aqueous extracts against G.citri-aurantii, the inhibition of mycelial growth ranged between 80 and 100%. Furthermore, Cistus aqueous extracts totally inhibited germination of G.citri-aurantii arthrospores at a concentration of 5mg/mL. Among the plant species tested, C.laurifolius, C.salviifolius, C.monspeliensis, C.ladanifer and C.populifolius displayed the best fungistatic activity since the minimum inhibitory concentration (MIC) was <0.625mg/mL. Under invivo conditions, incidence of sour rot was lowered to 8.33% when fruits were treated with aqueous extracts of C.populifolius and C.creticus compared to 100% in the control. Disease severity was lowered to 3.74, 4.47 and 5.13% when fruits were treated with C.creticus, C.ladanifer and C.populifolius aqueous extracts, respectively. Using such these biopesticides in a replacement for synthetic fungicides or in combination with other established disease management practices could help control citrus postharvest decay in a more sustainable and eco-friendly way.
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