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IPM- Alfalfa Sampling Guidelines
Pest
Sampling Method
Growth Stage: Mid- March to First Cutting
Alfalfa weevil Minimum of 30 stems per field collected in a W-pattern, place stems top first in bucket, measure stem height and count the number of larvae per stem
Pea aphid Take 10 sweeps in 10 locations and count the number of aphids and beneficials
Growth Stage: After First Cutting (mid-May) to September
Alfalfa weevil – only for 2 weeks after first cutting Minimum of 30 stems/crowns per field in a W-pattern, place stems top first in bucket and count the number of larvae per stem/crown
Potato leafhopper Ten sweeps in ten locations – plants should be dry
Blister Beetle 10 sweeps in ten locations<
Garden webworm and other defoliators Estimate defoliation in 10 locations
University of Delaware Cooperative Extension