Crops and Water report 07-21 to 07-27

Weather and crop water use

Reference evapotranspiration (ET) in the Upper Republican NRD ranged from 1.70 inches at north parts of Perkins County to 2.20 inches in south Dundy County; we received between 0 and 1.70 inches in rain. To more accurately estimate rain and crop water use on your farm, look at the map provided, obtain weekly reference ET value from location closest to you and multiply that value by crop coefficient provided in the table.

ET and rain 7-21 to 7-27

Weeds control in wheat stubble

Strip of uncontrolled downy brome next to the wheat stubble will cause problems in the future
Strip of uncontrolled downy brome next to the wheat stubble will cause problems in the future

Time to control weeds in the wheat stubble! New Cropping systems specialist from Panhandle Research and Extension center, Cody Creech, suggested 3 steps to control weeds in wheat stubble: (1) Carefully identify weeds that are present in your field, (2) spray weeds kochia, Palmer pigweed, pricly lettuce, Russian thistle and other tough to control summer annuals with tank-mix of glyphosate, dicamba and/or 2,4-D to prevent seed development (3) monitor for winter annual weeds like rye, marestail and cheetgrass and plan timely herbicide application in fall and early spring. For more information click here.

Corn

Corn is at reproductive growth stage. Adults of Western Bean Cutworm have been emerging in past week and spraying has been done in the area. UNL’s recommended threshold for insecticide application is 5-8% of corn plants have egg masses and/or small larvae.

Western bean cutworm egmass
Western bean cutworm egmass

Other crops

Sunflowers are at V5 to butonization stage. Field peas harvest is done. Soybeans are at R2-R4 growth stage (setting pods). Milo is at booth stage. Potatoes in tuberization stage. Dry beans are at 80%-full cover. Sugarbeets are at full cover.

Crop report July 21

Weather and crop water use

Isolated t-storms delivered from 0.2 to 1.8 inches across Upper Republican NRD. Reference evapotranspiration (ET) losses were 2.0 inches on average. To estimate crop water use on your farm look obtain weekly reference ET value from location closest to you and multiply that value by crop coefficient provided in the table.

ET and rain 7-13 to 7-20
ET and rain 7-13 to 7-20

Wheat

Wheat harvest is 95% done! Dryland yields range from 20 bu/ac to 90 bu/ac. Farmers that had hard winter kill and didn’t spray wheat for stripe rust had lover yield and lower test weight (about 53-55 lbs/bu). Wheat kernels diseased with ergot and/or Fusarium head scab have been observed. Although these did not appear to be a major yield limiting factor wheat can affect marketability of wheat seed. Loads can be rejected at the elevator if 0.05% of wheat kernels have ergot (about 0.5 oz/bu) or if over 1 ppm concentration of DON toxin has been detected in Fusarium-damaged kernels. Setting up your combine to blow out “chaffy” seed take care of this problem.

Ergot in wheat
Ergot in wheat
Wheat kernels infested with Fusarium head scab
Wheat kernels infested with Fusarium head scab

Corn

Corn is at V14 to tasseling growth stage. Adults of Western Bean Cutworm have been emerging in past week. If 5-8% of corn plants have egg masses and/or small larvae, consider an insecticide application either through a center pivot irrigation system of by airplane. It may be beneficial to select an insecticide that controls both spider mites and Western Bean Cutworm as mite populations are increasing in the area. Resistance of Western Bean Cutworm to proteins expressed in transgenic corn has been observed in SW Nebraska. Only the Bt corn hybrids containing Cry1Ftoxin (e.g. Herculex I, Herculex XTRA, SmartStax) are effective in controlling the pest. For more information on Western Bean Cutworm and its management click here.

Other crops

Field peas harvest is in progress; dryland yields of 40 bu/ac have been reported. Soybeans are at R1-R3 growth stage. Milo from V8 to booth. Potatoes are in tuberization stage. Dry beans are at 50-80% cover. Sugarbeets are at full cover.

40 bu field peas harvested from this on-farm research study
40 bu field peas harvested from this on-farm research study