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Jonathan Kleinjan

SDSU Extension Agronomist


Raven Precision Agriculture Center 117
Agronomy, Horticulture & Plant Science-Box 2207
Brookings, SD 57007

Jonathan supports the citizens of South Dakota in his role as an SDSU Extension Agronomist at the South Dakota State University campus in Brookings.

State & Regional Offices

SDSU Campus

Also by Jonathan Kleinjan

A female Hessian fly on a blade of wheat.

Hessian Fly: Winter Wheat Planting Date Considerations

As winter wheat planting rapidly approaches, there are many factors that should be considered. One of those factors is choosing a planting date to avoid Hessian fly issues. Learn some expert tips for selecting a safe planting date for your region.

a golden wheat field stands under a light blue sky

SDSU Extension to host 34th annual Winter Wheat Meeting Aug. 17 in Draper

July 26, 2023

South Dakota State University Extension and the Jones County Crop Improvement Association will host the 34th Annual Winter Wheat Meeting on Aug. 17, 2023, in Draper, South Dakota.

Maturing wheat field with lodged plants.

Hessian Fly Pupae Detected in Central South Dakota

Recent reports of lodged wheat in central South Dakota revealed Hessian fly pupae in the lodged plants. Learn how to identify and manage this pest before it impacts your wheat harvest.