Appling County Crop E News

Peanut Rx and Shortage of Chlorothalonil in Peanut

Below is a link to the 2018 Peanut Rx. It allows growers to assess their risk to tomato spotted wilt, leaf spot diseases and white mold. It also notes which varieties have some resistance (or increased susceptibility) to the peanut rootknot nematode (Meloidogyne arenaria), Cylindrocladium black rot (CBR) and Rhizoctonia limb rot. http://www.caes.uga.edu/content/dam/caes-website/extension-outreach/commodities/peanut-team/docs/2018/2018-Peanut-Rx-Disease-Risk-Index.pdf

In 2018, there is the possibility that peanut growers may face a shortage of chlorothalonil (brand names Bravo, Echo, others).  In addition to this, many growers are also not able to use propiconazole (brand names Tilt, Artisan, and others) anymore due to other restrictions.  With the loss or shortage of these two products, growers may be wondering what they can use for management of peanut leaf spot in situations where they would normally use 1.5 pints of chlorothalonil per acre, or an application of propiconazole.  Below are some options that are considered as effective or better than 1.5 pts of chlorothalonil for managing leaf spot in peanuts.  The Priaxor application is intended to replace 2 chlorothalonil sprays.  Thanks to Bob Kemerait, UGA Plant Pathologist, for providing this information.

Options for Loss of Tilt, Shortage of Chlorothalonil in Peanut
• MAZINGA (2 pt/A): Chlorothalonil, Tetraconazole
• 1 pt/A Chlorothalonil + 2.5 fl oz/A Domark (Domark can be apllied to rates as high as 6.9 fl oz/A)
• 1 pt/A Chlorothalonil + 5-10 fl oz/A Topsin M
• 1 pt/A Chlorothalonil + 5.5 fl oz/A Alto
• 1 pt/A Chlorothalonil + 10 fl oz/A Eminent VP
• 1 pt/A Chlorothalonil + 7-14 fl oz/A Topguard
• 2 lb/A Koverall (mancozeb) + 14 fl oz/A Topguard
• 1.5 pt/A ELAST 400F (dodine)
• 3.5 fl oz/A Absolute
• 6.0 fl oz/A PRIAXOR (at 45 days, replaces two apps of chlorothalonil at 30 and 45 days)