Alan
G. Dexter
Sugarbeet Weed Control Specialist
The following table lists the herbicides which are best adapted for control of weeds in sugarbeets in North Dakota and Minnesota. Suggestions are made on how these herbicides should be used.
In order to obtain more complete and more effective weed control, herbicide combinations are often used.
The phytotoxicity of postemergence herbicides often is enhanced when applied to areas previously treated with a preemergence or pre-plant herbicide. Combinations of postemergence herbicides or preemergence herbicides may exhibit a higher degree of activity than from the use of the individual components of the combination. However, loss of weed control may also result from the use of herbicides in combination.
Use herbicide combinations with caution until experience or research has shown that the combination is effective and safe. Some suggested combinations are given in the table 1. Combinations which have given good weed control in the past have been diallate (Avadex), EPTC (Eptam), TCA, or cycloate (Ro-Neet) used preemergence or preplant incorporated followed by a postemergence application of phenmedipham (Betanal) or pyrazon plus dalapon (Pyramin Plus). Some sugarbeet damage resulted in 1970 from following Eptam or TCA with Pyramin Plus or Betanal. When Eptam or TCA will be followed with Betanal or Pyramin Plus, the rate of Eptam should be no greater than 2.5 pounds/acre on the very heavy soils and no greater than 2 pounds/acre on the lighter soils. The rate of TCA should be limited to 6 pounds/acre. Betanal should be used at no more than 1 pound/acre following a preemergence or preplant incorporated herbicide.
Barban (Carbyne) should not be applied with other herbicides as this generally reduces the effectiveness of the Carbyne (Table 2).
All agricultural pesticides which are tank mixed must be registered for use as a mixture by the U.S.D.A. Illegal chemical residues may result from use of unregistered mixtures.
Brass -- 30 A/nozzle
Plastic -- 90 A/nozzle
Stainless Steel -- 570 A/nozzle
1. Assume sprayer will travel at set speed. For band spraying only.
43560 sq. ft/A sq. ft. which would be covered by the spray from one nozzle in one minute |
X | gallons the nozzle applies in one minute | = | gallons per acre |
43560 sq. ft/A 7 in. = .583 band x 5 mph x 5280 ft/mile 60 minutes/hr. |
X | 1/8 gal. caught in 1 minute | = | 21.2 gallons per acre |
2. | capacity of spray tank gallons per acre applied |
X | gallons or lbs. product per acre desired | = | gallons or lbs. product to put in spray tank |
200 gal. 13.75 gpa |
X | 4 lb/A | = | 58.2 lbs. of product for each full spray tank |
3. | 43560 sp. ft/A area actually covered by spray in banding operation |
X | gallons used in test run | = | gallons per acre |
43560 sp. ft/A 7 in. = .583 ft. band x 12 rows x 700 ft. |
X | 2.5 gallons used | = | 22.2 gallons per acre |
4. | 43560 sq. ft/A sq. ft. covered in test run |
X | gallons used in test run | = | gallons per acre |
43560 sq. ft/A 24 ft. boom x 660 ft. 40 rods 1/8 mile |
X | 5 gallons used | = | 13.75 gallons per acre |
Sugarbeet Research and Education Board, Volume 1, pg. 4-7
1984 Sugarbeet Research and Extension Reports. Volume 15, page 105.