You would use between 1-2 oz of Chlorothalonil 720 SFT Fungicide per gallon of water for needlecast on spruce trees, spraying all current damaged areas and surrounding foliage to protect the tree.
Chlorothalonil 720 SFT is not specifically labeled to be winter squash (butternuts) or used on greenhouse grown crops.
The amount of Chlorothalonil 720 SFT that you will need to use cam vary depending on what you are treating for. Please consult the product label to find the appropriate rate for your needs.
Chlorothalonil 720 SFT Fungicide is not labeled for use on home lawns. If you are treating commercial turf such as golf courses, then you could apply this after cutting or seeding. Please let us know if you need assistance selecting fungicides for your home lawn.
Chlorothalonil 720 SFT Fungicide is intended for larger scale applications 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.
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).
If Chlorothalonil 720 SFT Fungicide goes into solution (no chunks, separating, etc), it should still be effective. It was repeatedly frozen and thawed it would be best to replace though.
It best to store in a temperature stable environment (between 45 and 75 degrees) and out of direct sunlight.
