Cotton thrips forecasting tool helps make preplant management decisions

North Carolina State University has developed a thrips forecasting tool to help cotton farmers make preplant management decisions.

Why use this tool?  Most everyone knows that you need something preplant for thrips, whether that is an insecticidal seed treatment or an insecticide in-furrow.  But should you use a seed treatment and an in-furrow?  What about a foliar spray?  This tool can help with those decisions.

What does this tool bring to the table?  We have known for some time that thrips injury is a function of weather-driven seedling growth and thrips pressure.  This tool uses planting date, temperature, precipitation and knowledge of when thrips pressure will occur and how severe it will be to predict when cotton is at risk.

How can I use this tool?  You can use this tool to save time and money on your farm by focusing your most intensive thrips management efforts on cotton that will be planted at a time that is most at risk for thrips.  It would also be a good idea to scout these areas more intensively as well (click here for the NC Cotton Scouting Guide).  If you base a thrips spray off injury, it is usually too late to prevent damage to the crop.  Immature thrips are a good sign that at-plant insecticides are running their course and a spray might be needed.  Don’t forget that cotton is most sensitive to thrips damage when the 1st true leaf begins to appear between the cotyledons, as illustrated in the photos.  Although foliar sprays at later stages (2-3 true leaves) may occasionally benefit yields, targeting sprays when the 1st true leaf appears has been proven to be the most effective.

When should I use this tool?  This tool will give the best predictions within 10-14 days after the date you use it since it is based on weather forecasts.  Therefore, you could use this tool two weeks before you plant to make preplant decisions, but you should also check…

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