August 2017 Insect Scouting Report

During this time of year, we get a lot of questions about what are we seeing in the fields. This is very dependent on the year and weather conditions so we felt it was important to share with you what we have been seeing.

Soybean Aphids


 

Every year our crop scouts are on the hunt for these pesky green bugs. Soybean aphid populations are unpredictable year to year and favor mild temperatures. The cooler the temperatures are, the longer they can survive. Plant stress, particularly drought, is also attractive to soybean aphids.

Should I Expect To See Soybean Aphids?

We have not been seeing soybean aphids above threshold (250 aphids per plant) on a widespread scale.Timely scouting is still important because aphid numbers can grow quickly. Continue scouting your fields in case conditions change and favor soybean aphid populations. 

But Is It Too Late To Spray?

There is still a chance that you may see them this year. Soybean aphids canstill be a problem through R5 and R6. It still may bbe economical to try and decrease the soybean aphid pressure. Contact your Centra Sota agronomist to discuss scouting. Aphids grow wings and will move back to buckthorn bushes (where they overwinter) sometime after mid-to late August, but the timing of this transition is unpredictable. Lastly, it is important to pay attention to the pre-harvest interval of the insecticide you are thinking of using. Pre-harvest interval (PHI) refers to the number of days that are required between the application and harvest. Be sure to determine approximately when you will harvest so you do not apply an insecticide that will delay harvest.

What About Resistant Aphids?

In recent years, there has been a reports of reduced control with. This can be attributed to the over spraying of pyrethroid insecticides, spraying too early or often, and not switching chemical groups or using an insecticide that has multiple modes of action. While the resistance is not widespread yet, nor is it at extreme levels of concern, it is important to keep in mind as you decide to what to spray or if you should spray at all. 

Spider Mites

We have been asked if we are seeing spider mites this year. Other than a few isolated cases, this is not a huge concern. Had the hot weather continued, the conditions would have been perfect for spider mites. However the spider mite populations could still explode depending on a few factors:

•    If hot weather comes our way, temperatures could cause a flare in spider mite populations.
•    Some insecticides to control aphids could cause spider to flare up because they kill many of the natural enemies of the spider mite.

While spider mites and soybean aphids are not a current worry for our agronomists and customers, keep an eye on temperatures, weather conditions and your fields to make sure insects do not reduce yield. If you have questions please contact your Centra Sota agronomists.

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