Vine weevil grubs live underground, so most of the damage they cause is going to initially appear on plant roots and the lower part of the stem,' says Allan Bossel, pest control expert at BBE Bed ...

"To scout for alfalfa weevil, collect 10 stem samples randomly from various areas of the field. Be sure to pick or cut the stem samples off at ground level and place them upside down in a bucket.

Additional agents being tested for toadflax control include the stem boring weevil Mecinus janthinus , the root boring moth Eteobalea serratella and the root galling weevil Gymnetron linariae. However ...