Issue No. 15, Article 10/July 2, 2004
Early-planted corn is currently pollinating and in excellent condition, thanks to moderate temperatures. Areas of fields that were excessively wet previously would now benefit from rainfall due to shallow-rooted corn. There have been some reports of Japanese beetles clipping silks, but these insects appear to be pretty widely dispersed in most cases because of the abundant food supply. Southwestern corn borer is hitting non-Bt corn in the southern and eastern portion of the region pretty heavily.
Double-cropped soybeans are now planted. Japanese beetles are causing defoliation in some full-season beans. Outside of septoria brown spot on some of the lower leaves, there are no noticeable disease problems at this time.
Alfalfa growers should continue monitoring regrowth after second cutting for damage from potato leafhopper.
The second cutting of hay is well along or about ready in much of the area.
Some wheat fields remain untouched, with many more but a memory. While not awe inspiring, that crop fared well in the face of scab pressure.
Silks have emerged in many cornfields, and with the emergence of silks have come "silk clipping" insect pests. Japanese beetles and/or rootworm adults (both western and northern) are the culprits in fields displaying such injury. Japanese beetles have apparently extended their territory this year (being observed in many areas for the first time), but reports of severe infestations are largely restricted to counties near the east-central edge of the west-central region. Many European corn borers are now moving inside the stalk.
As expected, foliar diseases fared well following a recent extended period of wet weather in some portions of this region. Soybean rust "look-alikes," such as Septoria, have been abundant, with reports of bacterial pustule as well. Gray leaf spot lesions have also started to appear in cornfields.
A second application of glyphosate will likely occur soon in some areas due to scattered ragweed recovery, and there is evidence that stem feeders have contributed to some of these resiliency problems once again.