![]() ![]() Should You Treat Junipers?Īlthough the galls don’t do much damage to junipers, treating them with fungicide can help prevent their spores from spreading. You can find this product in most farm and home stores ( such as Tractor Supply) or you can purchase it through ARBICO Organics. It contains myclobutanil as its active ingredient.Ĭopper is not a cure-all, but it can help in preventing damage to the leaves and fruit. Several extension agencies recommend that you use Immunox® to control cedar apple rust. Unfortunately, captan, the fungicide in many pre-mixed sprays for home fruit trees, does not work on this particular fungal pathogen. Only certain types of fungicides are effective.Įxtension agents at North Carolina State University attribute this trend to an increase in occurrences on apple trees in the state. The fungus that causes apple scab is now frequently resistant to the sterol-inhibiting fungicides, and manufacturers have moved on to using newer classes of fungicides. In the old days, sprays for apple scab would also take care of cedar apple rust. They are known as “SI,” or sterol inhibitors. The most effective types of fungicides to use are those that inhibit fungal sterols. The time to treat your tree is between the pink stage of the blossoms (when the leaves are turning green) to the period when the petals drop. This is critical in the spring, when the juniper galls are releasing their spores. If your tree has a history of infection with cedar apple rust, you will want to get ahead of the infection and take preemptive measures. Later in the summer, brownish cylindrical tubes with hairs sticking out appear underneath the yellow spots, or on the twigs and fruit. Instead of galls, infected apple and crabapple trees manifest circular yellow spots on the upper surface of their leaves soon after bloom. ![]() As few as 4-5 hours of rain at 50-75☏ is time enough to produce a severe infection on apples. If conditions are right, these telial horns produce another type of spore that produces yet another kind of spore, which is blown back to infect apple leaves and fruit. To make them even more outrageous, the telia are gelatinous. Instead of turning into a cockroach, the galls swell and grow spurs called telial horns that are brown at first but turn bright orange in the rain.Īpple cedar rust is straight out of the disco era with its large galls and radically orange telial horns that protrude in all directions. General tips for disease management for apple scab, fire blight and brown rot blossom blight prevention during the coming week are discussed on the Penn State Extension website.Not only do the galls on junipers look like an organism from a bad 1960s sci-fi movie, but the reproduction process is also something usually found only in a Star Trek episode.ĭuring the spring rains 18 months later comes a metamorphosis that rivals that of Kafka’s. In addition, brown rot blossom blight for stone fruit is a concern. Growers need to monitor their orchards very closely late week to ensure protection is on the trees prior to the weekend to prevent fire blight and apple scab. For fire blight, the Infection Potential EIP value will be around 200 in Adams County, indicating a potential for many infections to occur if there is a wetting event. Because the number of available overwintering apple scab spores are close to peaking and the conditions will be favorable for infection, disease pressure will be high. In addition, there is a potential for rain on April 17-18, causing the apple scab infection period to be extended. The weekend of April 15-16 will “prove to be a doozy if the forecast comes to fruition.” Based on the upcoming forecast, those days are predicted to be a major apple scab and fire blight infection period. With warm weather comes the threat of fire blight when trees are in bloom, especially if a moisture event (rain, fog) is in the forecast. Summer-like temperatures the first two weeks of April are moving trees through their bud stages quickly, especially for first-blooming varieties, such as Pink Lady and Gala. Trees will need to be protected prior to the weekend to prevent disease. Combined with warm temperatures, this will trigger a significant infection event for apple scab and fire blight. Rain is in the forecast for Saturday and Sunday. Apple trees in bloom will need protection to prevent fire blight April 15-16. Pink Lady king blossom about to pop open. This will trigger a “significant infection event” for apple scab, according to the Extension service. ![]() Warmer temperatures are forecast for April 15-16, which will likely bring on fruit tree blooms, according to Penn State Extension, with rains expected as well. Pennsylvania growers will need to monitor weather closely this weekend, with conditions likely to promote apple scab and fire blight infections.
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