Predicting Stalk Borer Development in Corn

June 13, 2016

Predicting Stalk Borer Development in Corn

By Robert Wright - Extension Entomologist

Map showing accumulated DD indicating scouting window for common stalk borer
stalk-borer-map-6-13-16
Figure 1. Degree days accumulated from Jan. 1 through June 12 using a 41°F base. (Map courtesy Nebraska State Climate Office)
Based on accumulated degree days, scouting should be underway across the state for common stalk borer (Figure 1).

For information on scouting and treatment see Stalk Borer Scouting and Management in Corn in the June 10, 2016 CropWatch.

Table 1. Degree day requirements for common stalk borer development and management (41°F base).
Degree day accumulation from Jan. 1Event (Egg and Larva Development)
575 Egg hatch begins
750 Egg hatch complete
1,400 10% of larvae move out of grasses
1,700 50% of larvae move out of grasses
Degree day accumulation from Jan. 1Event (Pest Control)
1,300-1,400 Begin scouting grassy field borders and corn
1,400-1,700 Make insecticide treatment decision in corn

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