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Spiny amaranth, Amaranthus spinosus

Spiny amaranth (Amaranthus spinosus) is a troublesome weed for both Hawaii's farmers and conservationists.

Photos: Kim and Forest Starr, Ted Radovich

Research and Extension Info for Farmers

Flaming young weeds at Waimanalo Expt. Station

Weed Management for Farmers

Weed Management Guide: University of Florida IFAS Extension

Weed Management in Vegetable Crops: University of Florida IFAS Extension. Information on weed control for many vegetables.

Weed Management University of Florida IFAS Extension. A wide collection of Information on weed control for agronomic crops, vegetables and citrus, lawn and garden weeds, nursery-pasture-forest, aquatic weeds, biological control, etc.

University of California IPM. Photos of crop pests and methods to control them.

Organic Agriculture

Weed Management in Organic Agriculture. Presentation by Dr. Ted Radovich (~1MB .pdf).

Flaming for Weed Management on Small Farms. Presentation by Dr. Ted Radovich (~1MB .pdf).

Vinegar for Weed Control: Site maintained by Purdue University for information on using vinegar for organic weed control

Weed Management for Organic and Sustainable Crops: Site contains many links to weed management for organic farmers and those seeking to reduce chemical inputs for weed management.

Initial evaluations of native Hawaiian plant introductions to stabilize the ecosystem against weed invasions at MAO Organic Farm. A field experiment was initiated at MAO Organic Farm in Lualualei Valley on Oahu in January 2007 to identify the agronomic attributes of four native plant species as intercrops in organic agriculture. (~9 MB)

Landscaping & Ornamentals

Landscape Industry Council of Hawaii (LICH) information on Invasive Species: Includes information on codes of conduct for nursery professionals, landscape architects, plant industry, garden centers, botanical gardens and arboreta, plus suggested plant to discontinue.

Purple nutsedge control in turf and ornamentals

Progress Report for Chemical Weed Control for Export Grade Potted Ornamentals - Period 01/01/02 – 09/30/03. Presentation made to USDA/Hawaii Grower funding review committee on 09/30/03. Dr. Joseph DeFrank

Progress report for chemical weed control in orchids. Presentation made to the Dendrobium Orchid Growers Association (on Oahu) on Jan. 09, 2003. Dr. Joseph DeFrank

Progress Report for Chemical Weed Control for Export Grade Potted Ornamentals - Period 01/01/02 – 12/31/02. Dr. Joseph DeFrank

Progress Report for Chemical Weed Control for Export Grade Potted Ornamentals - Period 01/01/01– 12/31/01. Dr. Joseph DeFrank


Close up of flamer