What does it mean when EIP reaches 100?
A. I’m getting many inquiries now relevant to HIGH INFECTION RISK when EIP is LOW (12 to 48) to MARGINAL (61 to 85). EIP = 100 means that approx 3-5% of the blossom OPEN that day are colonized. If you have 20% bloom, then 3% of 20% = (0.03 x 0.20)100 = 0.6% of open blossoms could be infected if it rains… etc. Maryblyt was built ON THE ASSUMPTION that there was an abundance of inoculum. A light to moderate amount of fire blight, if not properly and promptly attended to can provide an abundant amount of inoculum. Where an aggressive blight management program has been used and the overall number and distribution of potential overwintering cankers is low, then EIP=100= somewhere less than 3-5% flowers colonized.
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