S. from Bryan writes
Daconil Weather Stik Flowable Fungicide can not and should not be applied to blue spruce per the manufacturer advice on the product label. Chlorothalonil 720 SFT Fungicide (larger scale applications) or Garden Tech Daconil Fungicide (smaller residential applications) are alternatives for needlecast on spruce trees. Keep in mind, there is a risk of bleaching Blue Spruce with chlorothalonil for diseases. For best effectiveness, fungicides should be applied when the emerging needles are half elongated (1/2 to 2 inches in length). Chlorothalonil 720 SFT Fungicide is applied at the rate of 5.5 pints (88 fl oz)/per acre. This would break down to 2 fl oz per 1000 sq ft in a sufficient water volume for foliar applications.For smaller applications, Garden Tech Daconil Fungicide would be an easier rate per applciation. For Rhizosphaera Needlecast, the rate per the product label is 3 tbsp per gallon of water.
Answer last updated on: 06/05/2022
