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The following are comments from Dr. Anco’s e-mail list serve. I will post the images as soon as I have better reception.
Fungicides with 2,4-DB
Where compatible, combining different products in a single application saves time and fuel spent going across a field. While that much is itself apparent, we also know not everything can be mixed physically or functionally without gumming up/coagulating or causing reduced application efficacy. It is not uncommon for 2,4-DB to be applied with fungicides, and Bravo and teb are readily compatible with it. I have not looked at Aproach Prima specifically, but it should be compatible without causing increased injury. Manganese products specifically are more finicky with mixing well with others, so any mixes that potentially are considering manganese should undergo a mini jar test mixing a smaller volume of the target mix to bring to advance light what might later show up or be birthed in the sprayer.
Convoy and History of Soy
If peanut is planted in a field that has had more than one year of soybean in the last 4 years, it would be proactive to include more than tebuconazole for white mold control during fungicide applications. Asked about Convoy, the range in application rates provides flexibility where a 16 oz rate is close to twice as effective as an application of teb. Increased rates from 24 to 32 oz may be applied where increased control is targeted. It is good to also have several other products available for application, with Elatus and Excalia being effective choices as well whose maximum labeled rates are available for greater control efficacy. Where a field has a known history of elevated white mold disease, alternating between several active ingredients is a robust approach to managing disease and reducing the potential for resistance development, which we have so far thankfully not documented.
Kudos Compatibility
Kudos is the predominant growth regulator available and comes in a granular WDG formulation an OD liquid formulation. The WDG formulation is similar to the familiar granular Apogee formulation generally with respect to fungicide compatibility. The OD formulation may be more sensitive to mix compatibility for burn on peanut, although we have not looked extensively at the range of possible combinations. Attached is a picture from a small comparison we looked at last year for Kudos OD mixed with Provost Silver with NIS (with AMS added first) compared to WDG with NIS (with AMS added first). In that test, there was a minimal amount of injury overall that at that time was not markedly different from the OD applied without Provost Silver. Attached is a mixing order sheet for Kudos. Apogee was associated with a rainfastness of 8 hours. Kudos has been described as not required that long of a rain-free period prior to maximum absorption, when recommended mixing orders are followed, but I have not yet seen data detailing how much sooner that period may be.
Manganese Deficiency
Manganese deficiency shows up as a chlorotic yellowing between the leaf veins on new growth, which is typically near the top of the canopy. Following a supplemental application of manganese, further new growth tends to also show chlorosis. This is normal and may be followed up with an additional supplemental manganese application during the next fungicide application.
Zinc Toxicity
Zinc toxicity symptoms can range in appearance from chlorosis, to stunted plants, to crispy killed plants. Stems or lateral branches of peanut often show signs of splitting where affected by zinc toxicity. The included field pictures with a clustered area of dead and stunted plants were shared by a farmer who noted a building could have been on that spot years ago. Galvanized roofs can leach zinc into the soil, leading to a localized increased concentration of zinc in a field. During an actively growing crop year, not much can be done to manage zinc toxicity, aside from noting where at in a field it is occurring. Depending on the size of the affected area and the soil pH and the zinc level, there may be some options to lime to a higher pH in a following year, but that too has its limits to both around pH 6.5 or zinc levels less than 30 lb/A.
Dan Anco
Extension Peanut Specialist and Associate Professor
Department of Plant and Environmental Sciences
Clemson University – Edisto Research and Education Center
