At the beginning of the week, SC peanut acres were 98% planted. Peanut condition at that time as reported by NASS was 4% excellent, 66% good, 28% fair, and 2% poor. Following a chance of some additional rain these next few days and through the weekend, next week is anticipated to bring drier, warmer conditions, which should help crop development.
Hopperburn
Hopperburn shows up as a response to feeding by leafhopper. The most common of these is the potato leafhopper. This tends to show up first around field edges and can then sometimes work inward. The symptoms from feeding can be visible when the insect is no longer present. I generally do not recommend treating an entire field for hopperburn. Some folks have had success in treating a ring around the field. Insecticides available for leafhoppers are fairly broad spectrum and can flare spider mites under prolonged hot and dry conditions.
Tomato Spotted Wilt
The attached pictures include example symptoms of tomato spotted wilt. This disease is vectored by thrips and has a range of symptoms including chlorotic leaves, mottling, ringspot lesions, stunting, corky pods, and plant death. Once infections become symptomatic, we do not have management options available, although it can be helpful to make notes for use in following years.
Early Leaf Spot
Also shown are early leaf spot lesions. These are from untreated Emery peanut planted in a field that has not been rotated for a couple decades. Early leaf spot is comparatively less common in SC compared to late leaf spot, the latter of which is our predominant leaf spot disease. Early leaf spot can tend to start to develop earlier in the season compared to late leaf spot but also tends to have a slower rate of overall progression. Many of our fungicides are effective against both ELS and LLS. ELS lesions produce spores on the topside of their lesions, whereas LLS lesions have spore production on the bottom side of lesions.
Among other combinations, Cadre is compatible to be applied with Bravo, tebuconazole, and Warrant. I would add NIS to this mixture.
Dan Anco
Extension Peanut Specialist and Associate Professor
Department of Plant and Environmental Sciences
Clemson University – Edisto Research and Education Center
64 Research Road
Blackville, SC 29817
630-207-4926 cell