Jill Scheidt, agronomy specialist with University of Missouri Extension in Barton County, scouted area fields on July 3 to prepare this week’s field scouting report.
This week, Scheidt reported finding Fusarium in area wheat fields, along with marestail, waterhemp and Japanese beetles.
Fusarium in wheat may result in shriveled, shrunken and/or bleached kernels that have a pinkish cast to them. High levels of Fusarium can cause a low germination rate. Scheidt recommends testing germination by performing a home test or sending a sample to the Missouri Seed Improvement Association or Missouri Department of Agriculture.
Scheidt confirmed that large marestail and waterhemp are being seen in fields. According to MU Extension weed specialist Kevin Bradley, for large marestail control before soybean emergence, four pints/acre Gramoxone + 4 ounces/acre Sencor should provide good control.
“If soybeans are emerged, there is not a good option to kill marestail. For large waterhemp control Roundup paired with Cobra, Flexstar or Blazer are the best options,” said Scheidt.
According to Scheidt, Japanese beetles have been seen in the area. They generally do not require treatment in crop fields.
Threshold levels for Japanese beetle in soybean are 30% defoliation before bloom and 20% defoliation during or after bloom. Threshold levels in corn are three or more Japanese beetle per plant clipping green silks to one-half inch.
“Japanese beetles do not prefer feeding on corn foliage and do not feed in the whorl; if they reach 30% defoliation, treatment is justified,” said Scheidt.
Scheidt also noted that cover crops are a good option for fallow fields. Summer cover crops include: radish, turnips and cowpeas paired with sorghum-sudan.
“Sorghum-sudan should not be followed by wheat due to its alleopathic properties. Winter cover crops should be planted from September to November and include: winter pea, crimson clover and hairy vetch paired with cereal rye,” said Scheidt.
Cover crop information: http://aes.missouri.edu/bradford/research/organic/cover-crops.php
The weekly field scouting report is sponsored by University of Missouri Extension and Barton County Extension. For more information on this scouting report, or to learn how to receive it a week earlier by telephone, contact the MU Extension Center in Barton County, (417) 682-3579.