Effectiveness of Prohexadione Calcium and Fungicides Applied by Airplane Peanut Notes No. 170 2024
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Collapse ▲I talked with a grower who is 15 days out from his last spray and is considering his next fungicide spray with an airplane because fields are really wet. He also wanted to spray prohexadione calcium by airplane, as vine growth is increasing a great deal under the current conditions. Performance of both materials by airplane will be lower than application by ground. This is in part due to spray volume (5 gallons by air versus 15 or more gallons by ground.) We get greater coverage of foliage and movement of fungicide to the base of the plant where southern stem rot will develop (and Sclerotinia blight) when we use higher spray volume and pressure. Airplanes deliver much lower spray volumes and there is no real spray pressure to push products down in the canopy.
I recommended that the grower wait until he could apply prohexadione calcium with ground equipment. I understand the desire to push ahead with an airplane for the fungicide application. If that is the case, I recommended that the grower switch from Miravis plus Elatus (the scheduled fungicide mixture) to a less expensive option. My logic is that if you are going to take a risk on the application approach (airplane,) I would do so with a less expensive fungicide option and then come back with the Miravis plus Elatus in 10 to 14 days.
It is a hard call. Prohexadione calcium and Miravis plus Elatus are expensive and need good coverage of peanut plants to perform at optimum. This is achieved with higher spray volumes and spray pressure (i.e., ground application.)