Agronomy and Horticulture Department


Date of this Version



Insect Science, Plant Disease, & Weed Science, University of Nebraska Cooperative Extension, Institute of Agriculture and Natural Resources 89(09) (May 16, 1989)


Copyright 1989 University of Nebraska


In This Issue

  • When and How to Rotary Hoe
  • Turfgrass Research Field Day
  • Reclassification of Bromoxynil
  • Grass Control in Ornamentals
  • Scott Nissen Joins Faculty at Lincoln

When and How to Rotary Hoe

The rotary hoe, properly used is an effective tool for weed control in row crops. Crop plants seeded 1 to 2 inches deep escape appreciable injury from a rotary hoe. For best results weed seedlings should be in the "white stage," from germination to emergence at the time of hoeing. Timeliness is critical for success because emerged green weeds, even though small, are generally too well anchored for control. A second hoeing 5-7 days after the first provides improved control. A dry firm soil surface during the hoeing operation is· required. A rain-free period of several hours after hoeing is needed to desiccate the weed seedlings. Hot windy conditions for a few hours after the operation are best. A rainy period of several days seriously reduces the effectiveness of a rotary hoe program. A rotary hoe will not satisfactorily control larger-seeded weed seedlings including shattercane and velvetleaf because they germinate deeper in the soil and are more firmly anchored than small-seeded weeds such as pigweed and foxtails. Operational speeds of 7-14 mph are used in rotary hoeing. Effectiveness is greater at the faster speeds; however, injury to delicate crops also increases with speed.

Turfgrass Research Field Day

The 14th Annual UNL Turfgrass Research Field Day and Equipment Show will be held Tuesday, June 20, 1989 from 8:00 a.m. to 3:00 p.m. The Field Day will be held at the John Seaton Anderson Turfgrass Research Facility, just south of the Agriculture Research and Development center headquarters located at Mead, NE.

Reclassification of Bromoxynil

Bronate, Buctril, and Buctril + Atrazine herbicides have recently been reclassified as Restricted Use Pesticides. All of these products contain bromoxynil and significant label changes have occurred. Additions include: 1) New warning statements; 2) Specific use directions requ1r1ng additional protective clothing and clean-up procedures; 3) The requirement of mechanical transfer systems when handling 30 gallons or more product in a single day; 4) Use of enclosed cabs when applying 180 or more acres in a single day; and 5) New chemigation and aerial restrictions.