Robert from Iron Mountain, Mi writes
Propiconazole 14.3 is labeled for oak wilt. Per the label, “OAK WILT: OAKS Preventive and Therapeutic Treatment Use 10 ml of Quali-Pro Propiconazole 14.3 in up to 1 liter of water per inch DBH. For very high disease pressure, use 20 ml of Quali-Pro Propiconazole 14.3 per inch DBH. In the upper Midwest, treat oaks after June 15. Wounds in oaks in the upper Midwest between May 15 and June 15 attract insects that transmit the oak wilt pathogen. Oak trees exhibiting less than 20% crown loss from oak wilt have the best chance of responding to treatment by Quali-Pro Propiconazole 14.3. Preventive application is more effective than therapeutic treatment. Trees in advanced stages of disease development may not respond to treatment. 12 Uninfected trees will generally absorb the full amount of Quali-Pro Propiconazole 14.3 water solution within 2 hours when injected under pressure. Consider trees exhibiting specific symptoms or those symptomless trees immediately adjacent to a diseased tree infected. Symptomless trees separated by a primary plow line from diseased trees may be at less risk of infection. Infected trees will absorb the material more slowly due to the vascular plugging caused by the disease. If the Quali-Pro Propiconazole 14.3 water solution is not absorbed within 24 hours, the tree is considered high risk and has a poor chance of survival.”
Answer last updated on: 07/24/2019
