Insect Thresholds of Alfalfa Seed

Pest		Threshold	Reference
	alfalfa looper	treat when loopers are 1/2 to 3/4-inches long and damage is noticeable (same for armyworm)	UI CIS 231 (1996)
	alfalfa weevil	15-25 per sweep prebloom OR 25 per sweep during bloom	UI CIS 231 (1993)
	grasshopper/crickets	treat when grasshoppers are cutting off blossoms or seed curls	UI CIS 231 (1996)
	lygus bug	4 per sweep from prebloom to seed maturation; 10-15 per sweep late season when seed is hardening	UI CIS 231 (1996)
	pea aphid	150 per sweep and beneficial insects are not present
	spotted alfalfa aphid	20-30 per stem	UI CIS 231 (1993)
	two-spotted spider mites	treat before leaves are webbed	UI CIS 231 (1993)

Thresholds are not available for these pests: alfalfa seed chalcid; blister beetles; clover leaf weevils; clover root curculio; cutworms/armyworms, -army cutworm, -black cutworm, -spotted cutworm, -variegated cutworm; meadow spittlebugs; slugs; thrips; webworms; white grubs.

References:  UI CIS 231 Idaho insect control recommendations for alfalfa seed production.

Revised: August 12, 2008

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