 |
 |
|
|
|
Missouri Ag News Headlines |
 |
Scouting Report: Last Safe Dates for Wheat Approaching
Missouri Ag Connection - 10/16/2017
Jill Scheidt, agronomy specialist with University of Missouri Extension, reports for the October crop scouting update.
The Hessian fly-free date for planting wheat in counties between Vernon and Jasper and stretching east was Oct. 10.
"Hessian fly maggots hatch and feed on the grooves between the leaf sheath and stem with their sandpaper-like mouthparts that suck plant juices," said Scheidt.
In the fall, maggots usually feed on the lower leaves and can cause heavy damage. Infested plants become stunted and stiffly erect, and leaves are thickened with a bluish green color.
"Heavily damaged plants usually die during the winter," said Scheidt.
Insecticides are not recommended for Hessian fly control because of the difficulty of properly timing applications.
"Scout wheat for aphids after emergence until heading for threshold populations. Aphids vector Barley Yellow Dwarf Virus can severely stunt plants and effect yield," said Scheidt.
The last safe date to plant wheat in the southwest region is Oct. 30 to Nov. 5. At least 90 frost-free days are needed for double-crop soybeans to reach physiological maturity.
"Subtracting 90 days from the average date of the first killing frost in the fall gives the last average safe date for the emergence of double-crop soybeans," said Scheidt.
Winter annual weeds emerge in fall, winter or spring and compete with wheat for moisture, light, and nutrients. Winter annual weeds that germinate in the fall have the greatest effect on wheat yields; they initially compete with population and tillering.
Fertilization should take place during planting time in wheat. "A small application of nitrogen, such as 20 pounds nitrogen/ acre is recommended to ensure good fall growth. Phosphorus should also be added if soil tests indicate less than 45 pounds/acre of
phosphorus in the soil. Phosphorus aids wheat in winter hardiness," said Scheidt.
|
 |
|
 |
|
Copyright © 2024 - Farms.com. All Rights Reserved. |
 |
|
