Orondis (oxathiapiproplin, U15) targets the oxysterol binding protein that is a part of the cell wall. The active ingredient inhibits growth of the fungus as well as sporangia production and zoospore germination. Orondis has a low solubility (i.e., locally systemic), is translaminar; and will protect new growth. Orondis is currently sold as a co-pack with either mefenoxam (Orondis Gold), chlorothalonil (Orondis Opti), or mandipropamid (Orondis Ultra). Growers will be required to tank mix Orondis with its partner during 2016 season. In 2017, the partners will be formulated together. Orondis has different use rates and restricted seasonal use. The rates for Orondis and it counterpart will differ by crop, pathogen, and desired use (drip vs. foliar). Unfortunately, because of its registration date, Orondis was not included the 2016 Mid-Atlantic Commercial Vegetable Production Guide.
Orondis Gold 200 (oxathiapiprolin [OXTP] + mefenoxam, U15 + 4) — Growers using Orondis Gold will need refer to the Orondis Gold 200 (OXTP) label and the Orondis Gold B (mefenoxam) label.
Orondis Gold 200 targets damping-off caused pythium and/or phytophthora in cucurbits and fruiting vegetables (pepper, tomatoes, eggplant), and leafy vegetables (excluding brassica’s).
Many cucurbit and pepper fields in southern New Jersey can be differentiated simply by whether mefenoxam (Ridomil) insensitivity is present or not because of our long history of using mefenoxam/ metalaxyl for controlling P. capsici. In fields where mefenoxam-insensitivity is present, the P. capsici population is resistant at some level to the active ingredient in Ridomil. Fortunately, if Ridomil hasn’t been used for a few years, the pathogen will revert to being sensitive again. For the control of the crown rot phase of Phytophthora blight in cucurbits and fruiting vegetables (pepper, tomato, eggplant) and where mefenoxam-insensitivity is present or is known from past experience, growers should consider a plan such as below:
- At transplanting apply:
- Ranman (21) (via transplant water) or
- Presidio (43) (via drip)
- 14 days later after transplanting (rotating to the fungicide not used at transplanting) apply via drip:
- Presidio (43) or
- Ranman (21)
- 30 days after transplanting apply via drip:
- Orondis Gold (U15 + 4) or
- Rotate and tank mix one of the following plus fixed copper for the control of fruit rot phase when conditions favor disease development
- Zampro (45 + 40)
- Revus/Forum (40)
- Presidio (43)
- Ranman (21) + non-ionic surfactant (do not tank mix with copper)
For the control of the crown rot phase of Phytophthora blight in cucurbits and fruiting vegetables (pepper, tomato, eggplant) and where mefenoxam-sensitivity (i.e., the pathogen has not developed resistance) is present; growers should consider a plan such as below:
- At transplanting apply:
- Orondis Gold (U15 + 4) via drip
- 14 days later after transplanting apply one of the following via drip:
- Presidio (43) or
- Ranman (21)
- 30 days after transplanting apply via drip:
- Orondis Gold (U15 + 4)
- Rotate and tank mix one of the following plus fixed copper for the control of fruit rot phase when conditions favor disease development
- Zampro (45 + 40)
- Revus/Forum (40)
- Ranman (21) + non-ionic surfactant (do not tank mix with copper)
- Presidio (43)
- Ridomil Gold Copper (4 + M1)
All labels needs to be followed accordingly to help manage resistance development. Importantly, if Orondis is applied via drip system, it cannot be used as a foliar spray (and visa-versa). If Orondis is applied as a foliar application it cannot be used via the drip. Thus, growers planning on using Orondis need to plan ahead of time and accordingly! The rates for Orondis and it counterpart will differ by crop, pathogen, and desired use (drip vs. foliar). Click on -> Orondis Gold 200 and Orondis Gold B to find the Orondis Gold 200 labels. Remember, the label is the law.
