This field day is scheduled for Thursday, Sept. 10.
This field day is scheduled for Thursday, Sept. 10. It will be held at the KSU Southeast Agricultural Research Center at the Parsons field. The Parsons field is located immediately south of the intersection of US 400 and Ness road at Parsons. Registration for the tour will be from 8:30 to 9:00 a.m.
Dr. Randy Price, an agricultural engineer from K-State will talk abut Emerging Technologies in Agriculture. Kenneth Kelley, Crops and Soils Agronomist at the center, will be talking about Crop Rotation and Tillage Affects on Soil Organic Matter. Dr. Jim Long, Crop Variety Development Agronomist at the center, will give an update on Soybean Variety Research. Dr. Doug Shoup, Southeast Area Crops and Soils Specialist, will be talking about Wheat Fertility Management. Dr. Dan Sweeney, Soil and Water Management Agronomist at the center, will be talking about Starter Fertilizer for Corn in Conservation Tillage Systems.
There will be a sponsored meal for the event but no registration is required. This should be a very good meeting so plan to attend.
Earworms in soybeans
Earworms are a threat to soybean production every year. They tend to be worse in some years than others but they occur at damaging levels in some fields every year. So far this year, I have not seen anything that I consider above the economic threshold. However, that does not mean there is not a problem in certain fields. Only scouting will tell you for sure.
Earworms do their worst work in more mature soybeans as the pods begin to fill. However, they are most likely deposited as eggs by the moth as the beans begin to set pods. They will eat the side out of the pod and devour the beans before they ever have a chance to mature. This has a direct affect on yield potential. Defoliation is far less common and requires many more earworms for this to happen.
The generally accepted threshold for spraying earworms in soybeans in thirty inch rows is one small worm per one foot of row. If your soybeans are drilled, the threshold is lower than this. For example, if your drill is set up on 7.5 inch rows, the threshold would be one-fourth worm per foot of row.
Early in the earworm’s life cycle, you should be looking for small greenish worms with black heads and conspicuous black hairs on the body. Do not confuse them with the green clover worm which is always a light green color. The green cloverworm is very active and will wiggle violently if disturbed. They also have only four sets of prolegs on their back half whereas earworms have five. Let me know if you have questions about identification.
The scouting equipment is simple. A white ground cloth thirty inches square is really all you need. This can be used in both planted and drilled beans. In planted beans, simply place it on the ground between the rows. Bend about a foot of row on both sides over the ground cloth and then shake and beat on them vigorously. This will dislodge the worms and they should land on the sheet. This represents two feet of row. Count the number of worms present on the sheet and repeat this process in several different places in the field. Keep track of the total number of worms found and places checked and determine an average per stop. The threshold would be two small worms per stop or one worm per foot of row.
Checking for earworms in drilled beans is a little difficult. It is necessary to mash an area of beans the size of the thirty by thirty inch ground cloth. Once again, bend a foot of row over the cloth on either side and repeat the process as I have already described for planted beans. This should get you fairly close to the infestation level present. Remember that the threshold for worms per foot of row in drilled beans will be less and depends on the row width.
Let me know if you have questions or would like me to come and take a look at your beans. The number at our office is 724-8233.