Thursday, April 24, 2014

Plants Will Recover from Low Temperatures

Contact: Jill Scheidt, agronomy specialist
Headquartered at Barton County Extension Center
Tel: (417) 682-3579

LAMAR, Mo. –Wheat fields in southwest Missouri should recover from the cold temperatures they experienced the week of April 14 according to Jill Scheidt, agronomy specialist with University of Missouri Extension.

Scheidt scouted wheat fields around Irwin on April 23.

“The wheat will recover from the low temperatures last week. Wheat prior to jointing before the frost has no signs of freeze injury; wheat at or past the jointing has a little freeze injury on leaf tips,” said Scheidt.

While scouting, Scheidt did find one bird cherry oat aphid which is identified by the dark olive green color and the red band around the rear.

“This is well below threshold level of 12 to 15 aphids per foot of row, and does not require treatment,” said Scheidt.

Bird cherry oat aphids vector barley yellow dwarf virus which causes stunting and sometimes severe yield loss and should be treated for if at threshold levels.

“Corn will also recover from the cold temperatures. In fact, new growth has already emerged. Corn at the 2-leaf stage before the frost has freeze injury on the tips, but the growing point of corn is below ground until the 5-leaf stage,” said Scheidt.

Scheidt said she found no diseases or insects this week but it is the time to scout for black cutworm.

“Look for plants that have been clipped near soil level. Black cutworms can be found near the clipping and up to 2 inches deep in the soil. When touched, black cutworms will curl into a “C” shape and play dead,” said Scheidt.

Treatments are recommended when 2 to 4 percent of the corn seedlings are cut below ground and 6 to 8 percent of the seedlings are fed upon or cut above ground. Corn should be scouted for black cutworm until it reaches the 4 to 5-leaf stage.

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.


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