Wednesday, August 13, 2014

Soybean Aphid Update - August 11 & 12, 2014

Here are the results from the speed scouting fields around Olmsted County. We have been  scouting these fields over the past 3 weeks. The Speed Scouting Process - collect 30 plants throughout the field.  Count aphids on 11 plants, noting (+) if over 40 aphids/plant and (-) if less than 40 aphids/plant.  If  6 or less plants have over 40 aphids/plant, stop and then re-sample field in 7-10 days.  If you reach 7-10 plants with over 40 aphids/plant, continue counting aphids on 5 more plants, repeating the steps based on the number of plants with over 40 aphids/plant until you have counted all 30 plants.  The results will be a) Do Not Treat - re-sample in 7 -10 days, b) Re-sample field in 3-4 days or c) Confirm TREAT Decision by re-sampling in 3-4 days, then apply insecticide when confirmed.  

We will also make general observations in the field as we scout, population increasing, population exploding, presence of beneficial insects etc. As you can see, the population is increasing, and 3 Fields moved into the Confirm and Treat category. We will continue to scout these fields.  Lisa

Results August 11 & 12, 2014 in Olmsted County

Field 1 = 0 of 11 plants with over 40 aphids/plant = Re-sample in 7-10 days

Field 2 = 6 of 11 plants with over 40 aphids/plant = Re-sample in 7-10 days

Field 3 = 4 of 11 plants with over 40 aphids/plant = Re-sample in 7-10 days

Field 4 = 23 plants with over 40 aphids/plant = Stop Sampling, re-sample in 3-4 days

Field 5 = 27 plants with over 40 aphids/plant (population exploding) = Confirm TREAT in 3-4 days and then apply insecticide

Field 6 = 25 plants with over 40 aphids/plant = Re-sample in 3-4 days

Field 7 = 30 plants with over 40 aphids/plant, population exploding (since last week) = Confirm and TREAT
 
Field 8 = 30 plants with over 40 aphids/plant, population increasing, not exploding = Re-sample in 3-4 days and Confirm TREAT Decision

Field 9 = 4 plants with over 40 aphids/plant = Re-sample in 7-10 days

Field 10 = 8 plants with 40 or more aphids/plant = Re-sample in 7-10 days



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