![]() ![]() ![]() If mefenoxam-insensitivity is present, only use Presidio, Previcur Flex, Ranman, Revus, and/or phosphite fungicides.įor more information on these fungicides and specific crop use please see the 2022/2023 Mid-Atlantic Commercial Vegetable Production Recommendations Guide. Phosphite materials (FRAC code 33) such as Rampart, ProPhyt, or K-Khite may also be tank mixed with one of the above to help suppress Phytophthora blight. (Previcur Flex can be added to transplant water, see label for specific crop uses). Previcur Flex (propamocarb HCL, 28) at 1.2 pt/A 6F at transplanting via drip or directed spray at base of plant. (Ranman can be added to transplant water, see label for specific crop uses) Ranman (cyazofamid, 21) at 2.75 fl oz 400SC at transplanting via drip and in rotation. oz 4SC/A at transplanting via drip and in rotation. Presidio (fluopicolide, 43) at 3.0-4.0 fl. If applied as drip application it can not be applied as a foliar. Orondis Gold (oxathiapiprolin + mefenoxam, 49 +4) at 4.8 to 9.6 fl oz/A 1.67S at transplanting and 30 days after. Mefenoxam–1.0 pt Ridomil Gold 4SL/A or 1.0 qt Ultra Flourish 2E/A or metalaxyl (MetaStar)–4.0-8.0 pt 2E/A at transplanting via drip and 30 days later. Additionally, in past research trials, mefenoxam, Orondis Gold, Presidio, Previcur Flex, Ranman, Revus and the phosphites in rotation and/or tank mixes have offered very good control of the fruit rot phase of phytophthora blight. Orondis Gold (oxathiapiprolin + mefenoxam, 49 +4) is the newest fungicide available with a new active ingredient in a new FRAC group. Ranman has protectant activity and thus will offer some root protection where it comes into contact with. ![]() Presidio has locally systemic and has translaminar activity and should offer some protection of the root system via drip. Mefenoxam, metalaxyl, Previcur Flex, and the phosphites are the most systemic of the group and should readily be taken up the by plant via application through the drip. Importantly, if mefenoxam has not been used in particular fields on any crop for a number of years (more than 5+) the fungus may revert back to being mefenoxam-sensitive and control with these products may return. Growers with a known history of mefenoxam-insensitivity on their farm should use Presidio, Previcur Flex, or Ranman plus a Phosphite fungicide in rotation in their drip application programs. Mefenoxam or metalaxyl, both once widely-used to effectively control Phytophthora blight has been hit by resistance issues around much of Southern New Jersey the past decade. In the past few years a number of new fungicides, with new active ingredients, have become commercially-available for use on multiple crops. The Phytophthora pathogen has an increasing host range that now includes snap and lima beans and all crops, other than a few resistant bell pepper cultivars, lack any resistance to the pathogen.Ĭontrol of Phytophthora blight and Pythium are extremely difficult (even with the use of fungicides) in the wet weather conditions. Poor crop rotations with susceptible hosts only make matters worse. Unfortunately, Pythium and Phytophthora blight can be found on most farms in the southern part of the state. Most of New Jersey has been plagued by heavy regular rains and pop-up thunderstorms making conditions ideal for pathogens such as Phytophthora and Pythium. ![]()
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