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Last updated: October 11, 2002
South Florida Restoration Science Forum

Biological Control Efforts: Weeds


field marked with flags Without methyl bromide, weeds will be one of the greatest challenges facing growers. There are several herbicides that can be used in vegetable production, but many of these are not effective against the main weed problems in Florida, which include nutsedges, grasses, and a variety of broadleaf weeds.

fungi in a flask Fungi that are used have host ranges that are strictly limited to the target weeds and do not pose a threat to the environment. Fungi are produced in the laboratory and then applied to plants in the field.

spotted plant Using fungal plant pathogens for weed control shows promise as an alternative to methyl bromide. microscopic organism

Nematodes

galled plant root Nematodes can cause severe galling of vegetable plant roots. This inhibits the growth of the plant and reduces yield.

nematode Many chemicals alternatives are not effective in controlling nematodes. There are very few effective nematicides that are not harmful to the environment. Biological control combined with cultural control measures show the most promise for the future.

microscopic organism Fungi can be added to soil where they parasitize nematode eggs or feed on adults. These fungi are specific to nematodes and can be combined with transplant mixes for ease of application in the current production system.

Cultural Control Measures

tomato field with bahia grass cover Alternative production systems are being developed and evaluated. Tomatoes can be produced using a bahia grass cover. This prevents weed growth and supports a diverse soil microflora.

controlling weeds without herbicides Plastic mulches and soil solarization can reduce the need for herbicides. These practices can be combined with other tactics, such as organic amendments and biological control agents.

controlling weeds without herbicides These combinations can be manipulated to suit the problems that are specific to particular growing regions, pest problems, and crops.

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U.S. Department of the Interior, U.S. Geological Survey, Center for Coastal Geology
This page is: http://sofia.usgs.gov/sfrsf/entdisplays/pest_alt/weeds.html
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Last updated: 11 October, 2002 @ 09:42 PM (KP)