![]() ![]() Those first sprays are directed at those emerging leaves and a bit later at flower buds too. Then you begin counting those days all over again. For example, if you treat on a Saturday and then we have heavy rains immediately, effectiveness may be lost or at least limited, and another treatment is needed ASAP. The weather influences that frequency, so you use the calendar and conditions to count between applications. The goal is to protect newly emerging leaf tissue, so sprays are typically applied every 5 to 7 days, depending on the weather and product label. The cycle can continue on the tree once it is there, so you can see why preventing it to begin with is so important. Treatments can slow and then stop as warmer, drier air arrives, as the spores can no longer survive in those conditions. Spraying the ground under your crab or apples is ineffective though, as the spores can come from anywhere in the neighborhood. The infection comes from overwintering spores in last year’s leaves still on the ground. How long will I have to treat apple scab?Īs long as the cool, moist to wet weather is with us, we need to keep up the preventative measures. Protection is the name of game with this disease. Spray treatments need to start when the apple and crab buds are just swelling, and we can see the very tiniest amount of green tissue showing. When it comes to apple scab, preventing the infection and spread is up to us, the gardeners. ![]() ![]() That sneaky foliar fungal disease is out there right now, waiting for the right weather conditions and stage of development of our crabapples and apples. What is sad is by the time they see or report an issue, it is way too late to address the problem. In both cases, the cause is the same – a fungal disease that infects the foliage and fruits. The same thing can happen to our ornamental flowering crabapples. Our Master Gardener help desk gets emails mid-summer when apple trees drop many of their leaves, except for the outer 12 inches or so. ![]()
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