EVALUATION OF SOME TRICHODERMA SPECIES IN BIOLOGICAL CONTROL OF POTATO DRY ROT CAUSED BY FUSARIUM SAMBUCINUM FUCKEL ISOLATES

In the search for alternatives to the use of synthetic fungicides, aqueous spice extracts were evaluated for their effects on the mycelial growth of various spoilage pathogens and their ability to control potato dry rot and carrot cavity spot in vivo. Results showed that cinnamon, ginger and nutmeg significantly inhibited the mycelial growth of Aspergillus niger (Ascomycota), Fusarium sambucinum (Ascomycota), Pythium sulcatum (Oomycota) or Rhizopus stolonifer (Zygomycota), whereas horseradish extract did not lead to the inhibition of any microorganism at the tested concentration. Among the most effective extracts, 0.05 g mL‑1 of cinnamon extract completely inhibited A. niger and P. sulcatum, and 0.10 g mL‑1 of cinnamon extract completely inhibited F. sambucinum. A concentration of 0.05 g mL‑1 of ginger extract also caused 100% inhibition of P. sulcatum. In vivo, cinnamon extract significantly reduced lesions of potato dry rot and carrot cavity spot, and ginger extract reduced lesions of carrot cavity spot. These results indicate that aqueous cinnamon and ginger extracts could provide an alternative to the use of synthetic fungicides to control these pathogens.

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Postharvest suppression of potato dry rot (Fusarium sambucinum) in prenuclear minitubers by arbuscular mycorrhizal fungal inoculum

American Potato Journal ◽

10.1007/bf02851696 ◽

1996 ◽

Vol 73 (11) ◽

pp. 509-515 ◽

Cited By ~ 28

Author(s):

Brendan A. Niemira ◽

Raymond Hammerschmidt ◽

Gene R. Safir

Keyword(s):

Arbuscular Mycorrhizal ◽

Fusarium Sambucinum ◽

Dry Rot ◽

Fungal Inoculum ◽

Potato Dry Rot ◽

Arbuscular Mycorrhizal Fungal

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Identification and pathogenicity of Fusarium spp. associated with tuber dry rot and wilt of potato in Algeria

European Journal of Plant Pathology ◽

10.1007/s10658-020-02177-5 ◽

2021 ◽

Author(s):

Nadia Azil ◽

Emil Stefańczyk ◽

Sylwester Sobkowiak ◽

Saliha Chihat ◽

Houda Boureghda ◽

...

Keyword(s):

Potato Tuber ◽

Fusarium Oxysporum ◽

Phytopathogenic Fungi ◽

Pathogenicity Test ◽

Fusarium Sambucinum ◽

Fusarium Spp ◽

Dry Rot ◽

Potato Plants ◽

Potato Dry Rot ◽

Potato Wilt

AbstractFusarium is one of the most important genera of phytopathogenic fungi, causing potato wilt in the field and potato tuber dry rot during storage. The objectives of this study were to identify Fusarium species associated with both potato diseases in different growing regions in Algeria, and to assess their pathogenicity. Among the 152 isolates collected from symptomatic potato plants and tubers in different provinces in Algeria, 13 species of Fusarium and Neocosmospora were identified. Among these three species were isolated only from plants showing symptoms of Fusarium potato wilt (F. oxysporum, F. venenatum, Neocosmospora solani). Two species (F. culmorum, N. tonkinensis) and an isolate of Neocosmospora sp. were found exclusively in tubers with potato dry rot and the remaining ones (F. redolens, F. cf. tricinctum, F. sambucinum, F. cf. incarnatum-equiseti, F. nygamai, F. brachygibbosum and N. falciformis) were associated with both sample types. Fusarium sambucinum was the most frequent species (52.6% of isolates). Fusarium oxysporum and F. nygamai isolates were the most aggressive in the potato wilt pathogenicity test, and F. sambucinum isolates were the most aggressive in the potato tuber pathogenicity test. This is the first study identifying and characterizing potato dry rot and potato wilt pathogens in Algeria.

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