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Gardner, D. E. 1980. Acacia koa seedling wilt caused by Fusarium oxysporum f. sp. koae, f. sp. nov. Phytopathology 70:594-597.
ABSTRACT
A wilt disease was observed among koa (Acacia koa) seedlings in Hawaii. Fusarium oxysporum was consistently isolated from root and stem tissue of these plants, as well as from wilted A. confusa and A koaia seedlings. This fungus also may be responsible for, or contribute to, the premature decline and death of older koa trees established within Hawaii Volcanoes National Park. High wilt percentages among plants gorwing in pathogen-free growth medium indicate that the fungus is seedborne. Seed disinfestation procedures did not reduce disease incidence. A new forma specialis, Fusarium oxysporum f. sp. koae, f. sp. nov., is proposed for this pathogen.

FULL TEXT
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HOSTS
Acacia confusa - Formosa koa
Acacia koa - Koa
Acacia koaia - Koai'a, koai'e

PATHOGENS
Fusarium oxysporum - Fusarium

RELEVANT TO BIOCONTROL
No.

KEY WORDS
Wilt, Acacia koa, Acacia confusa, Acacia koaia, Fusarium oxysporum.

IMAGES
02_100 -- koa plants inoculated on March 15 with fusarium from large dying tree on Tantalus, and controls 02_100 - koa plants inoculated on March 15 with fusarium from large dying tree on Tantalus, and controls
PATHOGEN: Aspergillus melleus
02_101 -- koa plants inoculated on March 15 with fusarium from large dying tree on Tantalus, and controls 02_101 - koa plants inoculated on March 15 with fusarium from large dying tree on Tantalus, and controls
PATHOGEN: Aspergillus melleus
02_102 -- F. o. koae from wilted seedlings 02_102 - F. o. koae from wilted seedlings
PATHOGEN: Aspergillus melleus
04_085 -- Fusarium in Koa 04_085 - Fusarium in Koa
PATHOGEN: Aspergillus melleus
04_086 -- Fusarium in Koa 04_086 - Fusarium in Koa
PATHOGEN: Aspergillus melleus
04_087 -- Fusarium in Koa 04_087 - Fusarium in Koa
PATHOGEN: Aspergillus melleus
04_089 -- Fusarium from Koa stem 04_089 - Fusarium from Koa stem
PATHOGEN: Aspergillus melleus
06_008 -- koa wilt (fusarium) 06_008 - koa wilt (fusarium)
PATHOGEN: Aspergillus melleus
06_009 -- koa wilt (fusarium) 06_009 - koa wilt (fusarium)
PATHOGEN: Aspergillus melleus
06_010 -- koa wilt (fusarium) 06_010 - koa wilt (fusarium)
PATHOGEN: Aspergillus melleus
06_011 -- koa wilt (fusarium) 06_011 - koa wilt (fusarium)
PATHOGEN: Aspergillus melleus
06_012 -- koa wilt (fusarium) 06_012 - koa wilt (fusarium)
PATHOGEN: Aspergillus melleus
06_013 -- koa wilt (fusarium) 06_013 - koa wilt (fusarium)
PATHOGEN: Aspergillus melleus
06_014 -- koa wilt (fusarium) 06_014 - koa wilt (fusarium)
PATHOGEN: Aspergillus melleus
06_015 -- koa wilt (fusarium) 06_015 - koa wilt (fusarium)
PATHOGEN: Aspergillus melleus
06_016 -- koa wilt (fusarium) 06_016 - koa wilt (fusarium)
PATHOGEN: Aspergillus melleus
06_056 -- wilted Koa seedlings with healthy roots but Fusarium oxysporum on stems 06_056 - wilted Koa seedlings with healthy roots but Fusarium oxysporum on stems
PATHOGEN: Aspergillus melleus
07_047 -- dying koa tree wilt, HAVO 07_047 - dying koa tree wilt, HAVO
PATHOGEN: Aspergillus melleus
07_049 -- dying koa tree wilt, HAVO 07_049 - dying koa tree wilt, HAVO
PATHOGEN: Aspergillus melleus
07_050 -- kahili ginger inoculated with Pseudomonas solanacearum 07_050 - kahili ginger inoculated with Pseudomonas solanacearum
PATHOGEN: Aspergillus melleus
07_051 -- dying koa tree wilt, HAVO 07_051 - dying koa tree wilt, HAVO
PATHOGEN: Aspergillus melleus
08_008 -- Fusarium oxysporum f. sp koae chlamydospores 08_008 - Fusarium oxysporum f. sp koae chlamydospores
PATHOGEN: Aspergillus melleus
08_009 -- Fusarium oxysporum f. sp koae chlamydospores 08_009 - Fusarium oxysporum f. sp koae chlamydospores
PATHOGEN: Aspergillus melleus
16_096 -- young dead Koa tree, HAVO 16_096 - young dead Koa tree, HAVO
PATHOGEN: Aspergillus melleus
27_103 -- Cindy Furukawa helping with faya tree work 27_103 - Cindy Furukawa helping with faya tree work
PATHOGEN: Aspergillus melleus
27_104 -- Lisa Nakamura at top of Mauna Loa strip road 27_104 - Lisa Nakamura at top of Mauna Loa strip road
PATHOGEN: Aspergillus melleus
28_065 -- Fusarium growing from logs from dying koa tree on Mt. Tantalus, Oahu 28_065 - Fusarium growing from logs from dying koa tree on Mt. Tantalus, Oahu
PATHOGEN: Aspergillus melleus
45_080 -- Acacia koa 45_080 - Acacia koa
PATHOGEN: Aspergillus melleus
45_081 -- Acacia koa 45_081 - Acacia koa
PATHOGEN: Aspergillus melleus

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