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Monarch Resources are Declining
Milkweeds and nectar sources are declining due to development and the widespread use of herbicides in croplands, pastures and roadsides. Because 90% of all milkweed/monarch habitats occur within the agricultural landscape, farm practices have the potential to strongly influence monarch populations. Why we are concerned:
• Farm and ranch land is disappearing at rate of nearly 3,000 acres per day. In a 5-year period starting in 1992, 6 million acres of farmland (an area the size of the state of Maryland) were converted to subdivisions, factories, and other developments (www.farmland.org).
• Widespread adoption of herbicide-resistant corn and soybeans in the last 5 years has resulted in the loss of at least 80 million acres of monarch habitat.
• Use of herbicides along roadsides continues to reduce milkweeds and nectar plants.
Roadside Management
The use of herbicides and frequent mowing along roadsides has converted much of this habitat to grasslands – a habitat generally lacking in food and shelter for wildlife. These habitats constitute 2-4% of the land area throughout the monarch’s summer breeding range. Although some states have started to increase the diversity of plantings along roadsides, including milkweeds, these programs are small.