Black Cutworms and Armyworms Among Concerns for Southwest Missouri Crop Farmers this Week
Contact: Jill Scheidt, agronomy specialist
Tel: (417) 682-3579
E-mail: scheidtjk@missouri.edu
LAMAR, Mo. –Jill Scheidt, agronomy specialist with University of Missouri Extension in Barton County, scouted area fields on June 5 to prepare this week’s field scouting report.
Scheidt says Armyworms are still being seen at threshold level in wheat and fescue fields.
Threshold level for armyworms in wheat and fescue are 4/ sq. ft. or when 2-3 percent of heads are clipped. Mustang Max is recommended to control armyworm because it provides the longest residual effect.
“Armyworms were moving slow, but keep a close eye on them, checking 2-3 times per week for threshold levels, as armyworms at threshold levels can clip heads on half a field in one night. Recent rains may have slowed feeding and may have brought in a fungus that kills armyworms.
BLACK CUTWORMS
Below threshold levels of 1-2 percent of corn plants were clipped above ground due to black cutworm feeding. Threshold levels for black cutworm are when 6-8 percent of plants are clipped above ground or when 2-3 percent of plants are clipped below ground.
“Scout fields for black cutworm until corn reaches the 5-leaf stage. Black cutworms do not feed on corn once it is past the 5-leaf stage,” said Scheidt.
SWITCHING TO SOYBEANS
“If you are thinking about switching from corn to soybeans, soybeans should NOT be planted into fields where applications of atrazine or an atrazine premix have already been made this season,” said Scheidt. “The label says soybeans should not be planted until the following year due to the likelihood of soybean injury from residues of atrazine that may still be present in the soil.”
The average field half-life of atrazine is 60 days. High soil pH’s (>7.5) will also slow the degradation of atrazine, along with cool soil conditions. Fortunately, replanting corn or planting grain sorghum into these damaged areas will still be an option.
MORE INFORMATION
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 you can receive it a week earlier by telephone, contact the MU Extension Center in Barton County at (417) 682-3579.
Tel: (417) 682-3579
E-mail: scheidtjk@missouri.edu
LAMAR, Mo. –Jill Scheidt, agronomy specialist with University of Missouri Extension in Barton County, scouted area fields on June 5 to prepare this week’s field scouting report.
Scheidt says Armyworms are still being seen at threshold level in wheat and fescue fields.
Threshold level for armyworms in wheat and fescue are 4/ sq. ft. or when 2-3 percent of heads are clipped. Mustang Max is recommended to control armyworm because it provides the longest residual effect.
“Armyworms were moving slow, but keep a close eye on them, checking 2-3 times per week for threshold levels, as armyworms at threshold levels can clip heads on half a field in one night. Recent rains may have slowed feeding and may have brought in a fungus that kills armyworms.
BLACK CUTWORMS
Below threshold levels of 1-2 percent of corn plants were clipped above ground due to black cutworm feeding. Threshold levels for black cutworm are when 6-8 percent of plants are clipped above ground or when 2-3 percent of plants are clipped below ground.
“Scout fields for black cutworm until corn reaches the 5-leaf stage. Black cutworms do not feed on corn once it is past the 5-leaf stage,” said Scheidt.
SWITCHING TO SOYBEANS
“If you are thinking about switching from corn to soybeans, soybeans should NOT be planted into fields where applications of atrazine or an atrazine premix have already been made this season,” said Scheidt. “The label says soybeans should not be planted until the following year due to the likelihood of soybean injury from residues of atrazine that may still be present in the soil.”
The average field half-life of atrazine is 60 days. High soil pH’s (>7.5) will also slow the degradation of atrazine, along with cool soil conditions. Fortunately, replanting corn or planting grain sorghum into these damaged areas will still be an option.
MORE INFORMATION
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 you can receive it a week earlier by telephone, contact the MU Extension Center in Barton County at (417) 682-3579.
Labels: Armyworms, black cutworms, field crop scouting report, switching from corn to soybeans
posted by David L. Burton at 6/06/2013 01:50:00 PM
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