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A green sunflower head with brown frass throughout.

Sunflower Moths Causing Problems

While scouting late-planted sunflowers two weeks ago, there were increased observations of sunflower moth caterpillars in the heads that were later than the rest of the field. Sunflower moths are best managed as moths or early instar larvae.

A white and purple seedhead of a Canada thistle with a blurry, bright green background.

Perennial Weed Management in the Fall

Most herbicide applications to manage perennial weeds have already occurred. However, now is the time to consider fall applications for weeds that were not treated or escaped the spring application.

Hands holding a corn leaf with a single tar spot lesion developing.

South Dakota Tar Spot Update: September 9, 2024

Tar spot is a potentially yield-impacting disease of corn, and it was recently found in plant samples from Minnehaha and Turner counties. Learn some expert tips for scouting and managing it this season.

Tractor applying residual herbicide to a bare field.

Fall-Applied Residual Herbicides

Many parts of South Dakota can experience dry conditions when residual herbicides are applied, resulting in inadequate weed control. In these areas, residual herbicides can be applied in the fall and take advantage of a longer period to receive activating precipitation.

Small, green and yellow florets being held by a hand.

Isolated Female Waterhemp Plant Produced Seed: Implications that pollen is in the air

Recent observations by the SDSU Extension Weed Science team highlight that pollen can move far distances to pollinate isolated female plants. This reinforces the need to effectively manage weeds in fields and adjacent areas.

Two beef calves standing in a dry, fall pasture.

Combatting Drought Conditions With Early Weaning

Producers experiencing drought conditions should consider early weaning to reduce fall grazing pressure and facilitate some pasture recovery before dormancy.

Several plastic bottles of pesticides gathered together in a white tub.

Managing Waste Pesticides: Restricted Use Pesticides

While pesticides are intended only to impact pests, they can have negative consequences on unintended targets, such as humans and wildlife, if not handled properly. Learn what steps you need to take to safely dispose of unused pesticides and comply with regulations.