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Japanese knotweed is one of the most difficult weeds to eradicate due to its extensive woody root system. In England it is notorious for caving in basement walls where it was planted as a foundation plant. At least 15 years ago I discovered a 'nice' patch of Japanese bamboo along the banks of the Skunk River near the old city pool (Figure 1).
ISU Field Agronomists around the state have noted Japanese beetle feeding injury in corn and soybean over the last week. Japanese beetles have a wide host range that includes many species of fruit and vegetable crops, ornamentals, and field crops. Adults prefer to feed between soybean leaf veins but can ultimately consume most of the leaf.
This past week I have been busy with disease diagnostic workshops at the ISU Field Education and Extension Laboratory. For those of you who have attended my sessions before, you know that I usually have a quiz that consists of leaves with various diseases and disease look-a-likes or imposters.