Phytophthora blight typically develops in low-lying areas after a heavy rain and can spread quickly throughout the entire field. Fortunately, New Jersey has been really dry this summer, but that does not need you don’t need to prepare for potential Phytophthora issues down the road. This is particularly important if are in fields with a known history of Phytophthora blight. Although the extended period of dry weather works against Phytophthora development, it does not mean it will not show up eventually.
Chemical Recommendations
| Code | Product Name | Product Rate
|
Active Ingredient(s)
(*=Restricted Use) |
PHI
(d) |
REI
(h) |
Bee
TR |
| For control of the CROWN ROT phase of Phytophthora blight, apply one of the following at transplanting and 30 days later. | ||||||
| 4 | MetaStar 2E AG | 4.0 to 8.0 pt/A1 | metalaxyl | 7 | 12 | N |
| 4 | Ridomil Gold 4SL | 1.0 pt/A1 | mefenoxam | — | — | N |
| 4 | Ultra Flourish 2E | 1.0 qt/A1 | mefenoxam | — | — | N |
| 21 | Ranman 400SC | 2.75 fl oz/A2,3 | cyazofamid | 0 | 12 | L |
| 43 | Presidio 4SC | 3.0 to 4.0 fl oz/A3 | fluopicolide | 2 | 12 | L |
| 49 + 4 | Orondis Gold 1.67SC | See labels1,2,4 | oxathiapiprolin + mefenoxam | 0 | 4 | — |
Recommendations for Organic Practices
Organic bell pepper growers with a history of the Phytophthora blight should only plant cultivars that have resistance or tolerance to the disease. Long non-host crop rotations are critically important for organic production. Regular applications of Double Nickel (Bacillus amyloliquefaciens) or Regalia (Extract of Reynoutria sachalinensis) as drenches or via the drip system prior to the onset of disease may help suppress Phytophthora blight development.
