Method and compositions for controlling round-leaved mallow usin

Details Method and compositions for controlling round-leaved mallow usin Method and compositions for controlling round-leaved mallow usin

1991-05-13

1994-03-22

Robinson, Douglas W.

Chemistry: molecular biology and microbiology

Spore forming or isolating process

435261, 435813, 435911, 4352541, 504117, A01N 6300, C12N 300, C12N 114

Patent

active

052963691

ABSTRACT:
Commercial mycoherbicide compositions for the control of round-leaved mallow weeds (Malva pusilla Sm.), the active ingredient being the spores of the fungus Colletotrichum gloeosporioides f.sp. malvae, ATCC 20767, these spores having been produced by a two-phase multi-staged liquid fermentation process, then separated from the mycelial biomass and concentrated into a spore slurry. The active ingredient of the mycoherbicide compositions, i.e., spores, can be packaged as a concentrated spore slurry or alternatively, dried and then packaged. Both the liquid and dry forms of the myco-herbicide are packaged in gas- and water-impermeable containers. The spores are stabilized prior to packaging or drying by the addition of a stabilizing agent or alternatively, stabilized after drying by adjusting their final water content. The initial, i.e., primary, fermentation phase may be made up of multiple stages and is performed under conditions which are optimized for production of mycelial biomass while restricting spore production. The final-phase fermentation is performed under conditions which limit mycelial biomass production but are optimized for production of the active ingredient, i.e spores. These mycoherbicide compositions are applied by suspending the spore slurries in water or alternatively, suspending the dried spores in water, and followed by spraying of the resulting suspension onto round-leaved mallow weeds. The active ingredient of these mycoherbicidal compositions, i.e., fungal spores, will control only round-leaved mallow weeds, and does not affect other weed species or non-target crop plants.

REFERENCES:
patent: 3849104 (1974-11-01), Daniel et al.
patent: 3999973 (1976-12-01), Templeton
patent: 4419120 (1983-12-01), Walker
Grant et al., Herbicide Interact. w/ C. gloesporioides f. sp. malvae, . . . and Effect of Selected Pest. on Survival of . . . , (pp. 716-723) (pp. 701-715) 1990.
TeBeest; 1985, Techniques for Testing & Eval. Plant Pathogens for Weed Control, (pp. 123-129).
Kirkpatrick et al., Potential of Colletotrichum malvarum for Biological Control of Prickly Sida, 1982, (pp. 323-325).
Stanbury et al., Principles of Fermentation Technology; 1984; (pp. 113-116).

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