Remember, the blossom blight infection risk level depends on four factors:1) blossom, 2) EIP greater than 100, 3) wetting and 4) warm average temperature. The risk level depends on how many of the four factors have been met. One factor = low, two factors = moderate, three factors = high, and four factors = infection. The EIP is an important factor to pay attention to because it represents the bacterial population. If EIP is at or near 100 then bacterial levels are expected to cause epidemic levels of infection. An antibiotic spray kills the bacteria, so antibiotics set the EIP to zero and the infection risk is averted, even though three other factors are still present.