Southern corn rust was confirmed on corn leaf samples from Fillmore, Nuckolls and Johnson counties in southern Nebraska this week. Warm, humid conditions may favor disease development, so fields in this area should be monitored frequently in the coming weeks.
The infestations appear to have occurred recently, as the aphids were only observed on leaves that had not yet expanded completely. The economic threshold for late vegetative through R5 stage soybeans is 250 aphids per plant with 80% of the plants infested and populations increasing.
Fungicide use in corn has become increasingly popular for many farmers for a number of reasons. But, it becomes a more difficult decision when corn prices are low and some producers are looking for ways to reduce input costs when profit margins are narrow.
Leafy spurge is also known as wolf’s milk, faitours-grass or tithymal, and reproduces from seed and vegetative root buds. It is 1 to 3 feet tall with blueish-green leaves with round edges. Flowers are surrounded by heart-shaped yellow-green bracts which hold three round to oblong seeds.
Prior to storms July 8-9, plants were nearing tassel, a critical time for photosynthesis and pollination. These storms resulted in “flattened” corn from lodging/leaning in addition to bent and snapped plants. "Recovery" depends on a variety of factors.
Silks and tassels are emerging and the smell of pollen is in the air in fields throughout the State! Two recent articles from Dr. Bob Nielsen, Purdue University, may be helpful for a refresher and also to learn something new regarding silk and tassel development and pollination.
Irrigation expenses are usually the biggest energy cost on the farm. On dry years, they become even higher. So how does one know when the system must be started and when it can be turned off? How should the low commodity prices this year affect these decisions?
This week, Tamara Jackson-Ziems shares about best management practices with fungicides as well as Northern Corn Leaf Blight, Megan Taylor talks about potato leafhopper and Aaron Nygren looks at corn ear formation.
Corn is rated 70% good to excellent and progressing ahead of last year but behind the five-year average. Soybean is rated 73% good to excellent and is progressing ahead of both last year and the five-year average. Winter wheat harvest is ahead of previous years with 50% complete.
Soil microbiology is a universal and essential component of agricultural soils. This NebGuide provides basic information of soil microbiology, microbial functions, microbial enhancement, and microbial assessment.
Social distancing ruled out an in-person field day this June. However, the Virtual Field Day website has a collection of videos and other online presentations (such as narrated Powerpoints) that convey the same type of information that would have been available in person.
Two new CropWatch podcast episodes are now available. These episodes feature podcast host, Extension educator Michael Sindelar, and Tamra Jackson-Ziems, Extension plant pathologist, as they discuss mid-season corn and soybean diseases.