ISSUE #397

397 - Cost Effective Sugarbeet Insect Control In 2001

3-22-01

Erratic weather patterns in 2000 make root maggot population predictions for 2001 somewhat difficult. In general root maggot populations were lower in all Minnesota counties in 2000. In North Dakota root maggot populations were lower south of Grand Forks. Adult fly survey counts by American Crystal Sugar Company agriculturists and NDSU scientists determined numbers to be moderate in southern Walsh County and along the Red River in Pembina and Walsh counties. Fly counts in northern Walsh County and Pembina County were at near all time record high levels in some townships, figure 1.

Sugarbeet Root Maggot*
Predicted Population Levels for 2001 Growing Season**

397

Your agriculturist has fly count numbers for your specific township in the RRV. The Pest Alert area of crystalsugar.com in the agronomy section has actual fly count numbers for May and June 2000 and site specific maps of fly populations.

Cultural Control Practices:

  • Early planting promotes large root systems that better tolerate insect damage.
  • Rotary hoe or harrowing before eggs hatch reduces survival.
  • Oat cover crop may reduce populations.

Cost Effective Control:

NDSU scientists are recommending insecticide rates based on expected root maggot population levels in 2001. High label rates of insecticides are not needed in low and moderate SBRM population areas, table 1. The 6-lb./acre-application rate of Counter should also effectively control wireworm problems.

Insecticide Rate Recommendations Based on Expected SBRM Population Level: Dr. Boetel, NDSU

InsecticideRecommended rates (product/ac) for expected population levelsTiming Options
LowModerateHigh
Counter 15G RUP 5.9 lb. 10.0 lb. 11.9 lb. Planting-time or Post
Chlorfos 15G RUP 10.0 lb. 10.0 lb. 13.4 lb. Planting-time or Post
Lorsban 15G RUP 6.7 lb. 10.0 lb. 13.4 lb. Planting-time or Post
Temik 15G RUP 6.7 lb. 10.0 lb. 14.0 lb. Planting-time & Post

 

Relative Insecticide RateApproximate Savings ($/A)
Low Versus High $10.00
Low Versus Moderate $6.75
Moderate Versus High $3.50

Chemical Control Practices:

  • Calibrate granular applicators
  • Achieve uniform even flow of granules over the row
  • Use band or spoon applications for best control
  • Incorporation of insecticide into soil
  • Use windshields on planters
  • Select the correct insecticide and rate

Management Strategies For High pressure Areas:

  • Use high label rates of insecticide
  • Consider a second application of granules
  • Consider a postemergence application at peak fly emergence
  • Consider tank mixing liquid insecticides with a micro-rate application on larger beets to save a trip over the field

Satellite Images of Your Fields in Three Easy Steps

When you are logged into the secure shareholder portion of crystalsugar.com website, click on the Field Satellite Images link. On the next screen you will see a map window with some selection steps to the left of the map. The first step is to select a crop year by clicking on the year you would like. The screen will clear and refresh with the fields from the crop year you selected. The next step is to select the field you would like by clicking on the down arrow in the field box and then clicking on the field you would like. The screen will clear and refresh showing the outline of the field selected. Next choose the image you would like by moving the slider bar in the select scene box until the date you want appears. Click on that date. The screen will clear and refresh with the image selected underneath the field boundary. You can examine all your fields from the years 1998, 1999 and 2000 with all the images available for each of those years.

In the next issue we will see how to extract those images and analyze the field’s vigor with the near infrared band.