Upcoming Events

• July 24: Science and Ag Family Field Day, 9 a.m. - 3 p.m., Haskell Ag Lab, Concord

• July 30-31: Good Farmer to Great Manager, Extension Office, Grand Island

• Aug. 1: South Central Ag Lab Field Day, near Clay Center

• Aug. 12-14: Nebraska Grazing Conference, Kearney

• Aug. 13-16: Soybean Management Field Days

• Aug. 19: Flame Weeding Workshop, ENREC (former ARDC) near Mead

• Aug. 19: CSI for Youth: Estimating Corn Yields, 5 p.m., jrees2@unl.edu

• Aug. 19: Ag Land Management Webinar, 6 p.m., Register: https://agecon.unl.edu/landmanagement

• Aug. 20: Summer Crop Field Day, Stumpf Farm near Grant

• Aug. 22: Soil Health Training, 8 a.m. - 5 p.m., ENREC near Mead

• *New Date-Aug. 20: York County Corn Grower Plot Tour, 5-7 p.m.

• Aug. 23-Sept. 1: Nebraska State Fair

• Aug. 27: Soybean In-Field Production Training, 8 a.m.-5 p.m., ENREC near Mead

• Aug. 28: Corn In-Field Production Training, 8 a.m. - 5 p.m., ENREC near Mead

Heat and pollination

With last week’s heat and anticipated heat later this week, we were receiving questions regarding the impacts of heat and humidity on pollination. You can view the entire article in this week’s CropWatch at https://cropwatch.unl.edu.

Key points include: Heat over 95 degrees depresses pollen production and prolonged periods of heat can reduce pollen production and viability. When soil moisture is sufficient, one day of 95-98 degrees has little or no impact on yields. After four consecutive days, there can be a 1% loss in yield for each day above that temperature. Greater yield loss potential occurs after the fifth or sixth day. High humidity, without a drop in humidity during the day, can delay pollination or prevent pollen from leaving anther sacs. We’ve been blessed we only had days of extended high heat around pollination, received a break in the heat in addition to weekend moisture.

Insect pests

From light trap reports, peak western bean cutworm (WBC) flight appears to have occurred last week, so scout for egg masses and live larvae with a 5-8% treatment threshold. Thistle caterpillars grew rapidly last week. Others are with me in considering spraying closer to 15% (instead of 20% threshold) with stressed fields from flash drought and/or off-target dicamba injury that don’t have canopy cover yet. In CropWatch, check out the articles regarding scouting for grasshoppers in field borders and what to expect for insects depending on crop growth stages yet this year.

Cattle losses from high heat

If the recent heat/humidity conditions are determined to be an extreme weather disaster event, then livestock losses would be covered by the Livestock Indemnity Program (LIP). Livestock producers who lost livestock should document losses in the expectation that they may be covered by LIP and contact your local Farm Service Agency (FSA) to report those losses.

South Central Ag Lab field day

View current field trials on improving crop production and profitability at UNL’s South Central Ag Lab (SCAL) on Aug. 1 near Harvard. Guests can customize their day to select the tours they’re most interested in. Presentation topics include: Cover crops, pollinators and weed management; European corn borer, corn rootworm, and cover crop insect control; Herbicide-resistant weed management; Assessing injury and management decisions in corn and soybeans; Corn and soybean disease updates; Sensor-based nitrogen management in irrigated corn; Corn stover harvest management and impacts; mobile beef lab and hail machine demonstrations. Registration is at 8:30 a.m. followed by tours through 4 p.m. Lunch and refreshments are included. CCA credits have been applied for. For more info. see the program brochure and register at: https://go.unl.edu/2019scalfieldday.

Silage webinar

With this year’s challenging weather and the need for forage, there may be more opportunities for harvesting corn for silage. Aimed at feedlot, cow-calf, and dairy producers, a silage webinar on Aug. 2 at noon will focus on moisture at chopping, chop length, inoculants, proper packing, silage covers and more. Pre-registration for the webinar is necessary and can be done at: https://go.unl.edu/vau7.

Trees losing leaves

The wet spring and humidity allowed for fungal diseases on leaves of shade trees with flowering pears and crabapples in particular dropping leaves early. I’ve also had a number of questions regarding red maple leaves (Autumn Blaze and Sunset) suddenly turning brown on trees. These symptoms may also be experienced on ash, tuliptree and other maples. We think it’s environmental stress from having so much cool and wet early to almost a ‘flash drought’ situation in eastern Nebraska prior to this weekend’s rains. Sarah Browning has been recommending watering and mulch as the best ways to reduce stress and to prevent additional root death and tree decline. I’ve been seeing new growth starting to occur on trees so my hope is if your tree is experiencing this, that 10-14 days from now you will also see new growth occurring on your trees.