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East Lansing (MSUHort) Alfalfa Weevil Development Assist Chart (Report issued 5/25/2013 16:51)

Start scouting for adults when temperatures are greater than 48°F

Life Stage Predicted Date Observed Date
1st-2nd instar (light feeding) 5/16/2013
(Temperatures from 3/1 - 5/16 used)
 
3rd-4th instar (major leaf feeding) 5/22/2013
(Temperatures from 5/16 - 5/22 used)
 
Pupa to adult (mating and egg laying - feeding ends) 6/1/2013
(Temperatures from 5/22 - 6/1 used)
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