Pacific Northwest Insect Management Handbook

Alfalfa Leafcutting Bee (Megachile rotunda) Pests

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Natalia Bjorklund, Katie Lamke, Surabhi Gupta Vakil, and Judy Wu-Smart
Revised: 
March 2019

In all cases, follow the instructions on the pesticide label. The PNW Insect Management Handbook has no legal status, whereas the pesticide label is a legal document. Read the product label before making any pesticide applications.

Protect pollinators: See How to Reduce Bee Poisoning from Pesticides.

Note: Products are listed in alphabetical order and not in order of preference or superiority of pest control.

Image related to Alfalfa Leafcutting Bee (Megachile rotunda) Pests
Alfalfa leafcutting bee
Megachile rotundata Fabricius
Immature molting
© Ken Gray Insect Image Collection
Image related to Alfalfa Leafcutting Bee (Megachile rotunda) Pests
Alfalfa leafcutting bee
Megachile rotundata Fabricius
Female adult
© Ken Gray Insect Image Collection

Alfalfa leafcutting bee

Hollingsworth, C.S. (Ed.). 2020 Pacific Northwest Insect Management Handbook.
© Oregon State University.

Use pesticides safely!

  • Wear protective clothing and safety devices as recommended on the label. Bathe or shower after each use.
  • Read the pesticide label—even if you’ve used the pesticide before. Follow closely the instructions on the label (and any other directions you have).
  • Be cautious when you apply pesticides. Know your legal responsibility as a pesticide applicator. You may be liable for injury or damage resulting from pesticide use.

Trade-name products and services are mentioned as illustrations only. This does not mean that the participating Extension Services endorse these products and services or that they intend to discriminate against products and services not mentioned.