Biological Control

Biological control offers a long-term solution for any purple loosestrife population size. While it takes longer to realize effects, lower input is required and the association between plant host and biological weed control agent eventually becomes self-sustaining. Additionally, the goal of releasing biological control agents against purple loosestrife is control not eradication.

Several insect species have been approved by USDA APHIS for introduction:

Galerucella calmariensis and G. pusilla - Leaf-feeding beetles
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Hylobius transversovittatus - Root-feeding weevils
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Nanophyes marmoratus - Flower-feeding weevils
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The Connecticut Purple Loosestrife Program utilizes the Galerucella leaf feeding beetles as the solution of choice. To learn how the process works, click here or use the sub menu at the top of the screen.

FROM PPT
  • Long-term control of any size population of purple loosestrife
  • Biological control takes longer to realize effects but requires lower input
  • The association between plant host and biological weed control agent eventually becomes self-sustaining.
  • The goal of releasing biological control agents against purple loosestrife is CONTROL not ERADICATION