Thread: Fusarium wilt
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Old 01-19-2008, 12:07 PM   #7 (permalink)
inkcube
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Default Re: Fusarium wilt

Quote:
Originally Posted by mskitty38583 View Post
in the panama diease, is it the dirt that causes the problem or is it a fungus on the trees? is it spread by the dirt? or is it an airborn disease? how can you tell if you have panama? ive still been trying to find out more about the afflictions of nanas and there isnt really that much that i can find.maybe im looking in the wrong places, anybody have a site that explaines more?
it is a soil borne fungus that can be spread in a variety of ways; contaminated soil on shoes, hands, tools, etc. i gave the symptoms above but here they are again:

Symptoms:

external symptoms including yellowing or collapse of the older leaves, occur on plants more than 4 months old collapse which occurs close to the stem-petiole junction. Sometimes the base of the pseudostem splits. Reddish to dark brown vascular discoloration occurs in the outer leaf sheaths, pseudostem, rhizome and fruit stalk. fruits do not show symptoms. usually all leaves collapse and the plant dies. ther disorders on banana have similar symptoms to those of Panama disease. Fusarium wilt does not cause wilting and blackening of young suckers nor a dry rot in fruit as can be found in moko disease and blood disease.

Four races of Panama disease (F. oxysporum f.sp. cubense) have been described.
-race 1 attacks cultivars in the 'Gros Michel' (AAA genome) and 'Pome' (AAB genome) subgroups and the 'Silk' (AAB genome) and 'Pisang Awak' (ABB genome) clones of banana;
-race 2 attacks 'Bluggoe' (ABB genome) and close relatives;
-race 3 attacks Heliconia spp.; and
-race 4 attacks cultivars in the Cavendish subgroup (AAA genome) and hosts of races 1 and 2 - it has already destroyed 12,000 acres this year.

until recently, race 4, the most destructive, had been detected on Cavendish cultivars only in subtropical production areas, where cold winter temperatures are presumed to predispose those cultivars to infection. a distinct population of pathogen, called tropical race 4, has caused considerable damage in Cavendish monoculture in tropical regions.

fusarium species live everywhere and can even infect humans but F. oxysporum f.sp. cubense is so far limited to tropical regions.
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