I thought some of you could use this...
Mycostop Developed from a naturally occurring bacteria, Streptomyces griseoviridis, Mycostop Biological Fungicide thrives in the root zone of plants. When applied as a drench or spray the dried spores and mycelium of the Streptomyces culture in Mycostop germinate and begin to grow on and around the plant roots. In doing so they create a biological defense against root infecting pathogenic fungi which cause disease such as wilt and root rot. Mycostop is used by growers for diseases caused by Pythium, Fusarium, Botrytis, Alternaria, Phomopsis, and to a lesser extent for Rhizoctonia and Phytophthora. It has particularly good activity against Fusarium.
Mycostop has been shown to increase plant vigor and yields even in the absence of obvious root pathogen activity. The explanation is that the Streptomyces produce plant root stimulating hormones (which has been demonstrated in the lab) or the Streptomyces control minor root pathogens which slowly feed on and damage roots.
Use Mycostop for the treatment of seeds, transplants and established plants.
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Quote:
llamabox said: I thought some of you could use this...
Mycostop Developed from a naturally occurring bacteria, Streptomyces griseoviridis, Mycostop Biological Fungicide thrives in the root zone of plants. When applied as a drench or spray the dried spores and mycelium of the Streptomyces culture in Mycostop germinate...
I don't know if those were your words or theres, but i've highlighed the confusing parts to me.
So is it a bacteria, a fungi, a fungicide, or what.
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Those are their words...
How Mycostop® acts in the control of fungal plant diseases. Introduction Both in in vitro and in vivo experiments, Streptomyces griseoviridis, the active ingredient of Mycostop, effectively inhibits the growth of a wide range of fungal pathogens. The antagonistic effect seems to be based on several modes of action. Rhizosphere competence In general, the competitive ability of actinomycetes in soil is poor, but as a root colonizer Streptomyces griseoviridis seems to be a good competitor. When introduced into moist soil Streptomyces microbes begin to grow especially in rhizosphere zone, where they obviously can utilize root exudates and sloughed root cells. There are indications that certain plant species favour the growth of S. griseoviridis more than some other species. This may be explained by various root exudates of different plants. - Unlike pathogens, streptomycetes are unable to invade root tissues but they act in the rhizosphere. Thus Mycostop is a protective, not a curative biofungicide. Hyperparasitism S. griseoviridis grows epiphytically on the hyphae of several plant pathogenic fungi. There are differences how the antagonist behaves on various pathogens and whether it disintegrates hyphae or conidia. Tapio et al. (1991) have shown that in the case of Pythium, S. griseoviridis penetrates the mycelial wall, but only some disintegration of the pathogenic hyphae was observed. The hyphae of Rhizoctonia solani and Fusarium oxysporum were slightly affected in the presence of S. griseoviridis. Fusarium conidia were not affected, whereas conidia of Alternaria were heavily colonized and almost totally destroyed. Cell wall degrading enzymes are needed in hyperparasitism. It seems obvious that S. griseoviridis produces extracellular enzymes with lytic characteristics. According to unpublished data, the production of chitinase was supported by the growth of S. griseoviridis on chitin, a major component of cell walls of many fungi. Antifungal metabolites Under laboratory conditions, Streptomyces griseoviridis K61 has been shown to produce aromatic heptaene polyenes that prevent the growth of fungal pathogens. However, the role of this antifungal metabolite in the disease control in growing medium is not known yet. Auxin excretion Higher yields of healthy crops (e.g. cucumber and gerbera) after Mycostop application indicate that a growth promoting factor may also be involved. Another hypothesis for vigorous growth and yield increases is the control of minor pathogens. Tuomi et al. (1994) have shown that S. griseoviridis produces auxin indole-3-acetic acid (IAA) in vitro. This metabolite can serve as a supplier of exogenous growth promoter, but the proof of the excretion of it in soil conditions still awaits for further study. Exogenously applied this hormone compound induces several effects in plants, one of them being stimulation of growth. Ref. Tuomi, T., Laakso, S. and Rosenqvist, H. 1994. Indole-3-acetic acid (IAA) production by a biofungicide Streptomyces griseoviridis strain. Ann. Bot. Fennici 31:59-63. Conclusions Streptomyces griseoviridis has several modes of action, and it is possible that the antagonist uses different mechanisms in diverse situations and against various pathogens. Antifungal metabolites play an important role at least in laboratory conditions, but it is not yet known if the antagonist behaves in the same way also in soil or other growing media. In practice, the ability of being among the first colonizers of the roots may be even more important. Hyperparasitism is also a potential mode of action. The fact that resistant strains of pathogens are unlikely to occur when using Mycostop, is probably due to the several different mechanisms of the biocontrol agent. If one mode of action fails the others may replace it, and the antagonist can still control the pathogen.
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