White-tailed deer (Odocoileus virginianus) are among the common mammal pests of field corn in Indiana.
White-tailed deer (Odocoileus virginianus) are among the common mammal pests of field corn in Indiana.
The “notched leaf edge” symptom in corn is a curious genetic leaf “disorder” that appears in certain hybrid families during periods of rapid development.
The past 30 days have been met with warmer than normal temperatures in the northern counties and drier than normal conditions throughout most of the state. This warm and dry environment is conducive to developing drought – particularly with the increased evapotranspiration rates. While climate outlooks are calling for increased confidence of above-normal precipitation throughout the rest of July, these events are likely to remain spotty with inconsistent coverage across the state.
Many plants have poisonous compounds that can cause all kinds of concerns, and even death, if consumed. The interactions that I have had with veterinarians, suggest that the yew is right at or near the top of plants that cause livestock death.
The field crop pathology research program is tracking the distribution of corn and soybean field diseases in Indiana. We are predominantly interested in the following samples (but always keeping an eye out for others):
Corn: tar spot, northern corn leaf blight, and southern corn rust
Soybean: frogeye leaf spot
Recent rains and increased humidity across Indiana have increased the risk for foliar diseases to develop in both corn and soybean. Much of the corn has begun to tassel and soybeans have begun to flower. We are starting to see common diseases in the lower canopy of corn, as we were out scouting this past week. A few diseases that I have seen included gray leaf spot, northern corn leaf blight, common rust, Physoderma brown spot and northern corn leaf spot in corn (Figure 1). Diseases in soybean have been extremely low – I found a few frogeye lesions this past week. Since we are at R1 it is time to scout your soybeans for frogeye leaf spot. Management practices for frogeye are aimed reducing soybean susceptibility and inoculum availability. Infected debris from previous crops is the primary source of inoculum for this disease. Any practice that helps reduced or[Read More…]
Reports of grasshoppers within fields have been received. The pictures and videos included with the emails showed numerous grasshopper nymphs severely defoliating soybean that were planted into a standing cereal rye cover crop. The soybean plants were delayed in growth, as they were shaded by the dying rye. Grasshoppers, as the name suggests, love feeding on a range of grasses but are certainly not limited to this group of plants.
When weed control is delayed in fields, previously unseen insects become nuisance pests for the growing crop. This week, agronomists in central and northeastern Indiana, sent pictures with the “What is this bug?” question. We’ve had similar encounters with the redheaded flea beetle in past years.
A considerable number of male western bean cutworm moths have emerged and been captured in the last week. Some pest managers have reported finding egg masses. As previously mentioned, the female moths seem to have a preference for depositing eggs on the upright leaves just before tasseling. The hatched larvae will crawl immediately to the whorl or leaf axils, depending on corn’s growth stage, for protection while feeding on leaf tissue and/or pollen
The grain fill period begins with successful pollination and initiation of kernel development, and ends approximately 60 days later when the kernels are physiologically mature. During grain fill, the developing kernels are the primary sink for concurrent photosynthate produced by the corn plant. What this means is that the photosynthate demands of the developing kernels will take precedence over that of much of the rest of the plant.
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