Jackie from Smithfield, Utah writes
My flowering pear tree has fire blight. Will Hi-Yield 38-Plus work for this?
Hi-Yield 38-Plus Insect Control 38% Permethrin is an insecticide only and will not affect any diseases. There is a great article here on this disease that recommends liquid copper. Bonide Liquid Copper Fungicide Concentrate is labeled for fireblight on pear trees, but it does need to be applied as a spray application since a systemic fungicide would not be effective. You would mix 0.5 to 2.0 fluid ounces of product per gallon of water, and the label states, "for fireblight apply in the dormant period, during season bloom, or as in-season cover spray. Do not exceed one application during the fall, late dormant period. Do not exceed one application between silver tip and green tip growth stages....Do not exceed 1 gallon of product per 100 gallons of water. Repeat application every 7-10 days during bloom and growing season if needed."
Answer last updated on: 03/30/2021
