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Alfalfa Weevil Degree Day Update (06/11/15)

The southeast area of North Dakota has accumulated enough degree days (DD) for the major leaf feeding stage (504 to 595 accumulated DD) by weevil larvae.

Alfalfa Weevil Degree Day Update

The southeast area of North Dakota ent.knodel.alfalfa weevilhas accumulated enough degree days (DD) for the major leaf feeding stage (504 to 595 accumulated DD) by weevil larvae. Scouting for alfalfa weevil larvae and defoliation is important in this area. With the rains and warmer weather, alfalfa is growing fast and could out growth any feeding damage. Egg hatch (330 accumulated DD) and young larva (371-438 accumulated DD) are occurring in the rest of the state. These areas will need to be scouting soon. For scouting protocol and economic thresholds, consult the NDSU Extension publication on E1676 IPM of Alfalfa Weevil in ND. Or, check out this short video on Stem Sampling for Alfalfa Weevil from the University of Minnesota by Bruce Potter.

ent.knodel.accbddmap

Janet J. Knodel

Extension Entomologist

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