![]() ![]() The models only identify risk of infection based on weather conditions.A listing of susceptible cultivars and rootstocks is linked from the NEWA model page for fire blight. If you have a young planting of a highly susceptible variety, it may be more important to protect these blocks based on model predictions than a 15-year-old ‘McIntosh’ planting on resistant rootstocks, which may not warrant the same level of protection during bloom. Adjust your interpretations of model predictions based on tree age, variety, and rootstock. Presently, none of the models consider these factors in a formal sense. Age and variety can play a large role in the development of fire blight. Consider the age and susceptibility of your trees.If there was no fire blight the previous season or if you have never had fire blight do not let excessive model predictions or extension alerts (including this article) “intimidate” you into applying unnecessary antibiotics each time an alert is released. Consider the history of fire blight in the planting.These results should not be substituted for actual observations of plant growth stage and disease occurrence determined through scouting or monitoring. The theoretical models predicting disease risk use weather data collected (or forecasted) from the weather station location. Predictions and forecasts are theoretical.Avoid using the less-accurate model default dates or generalized, region-wide dates if you have access to precise bloom information.Īs you consider disease forecasting outputs from NEWA or other forecasting models, here are some things to consider before making costly applications of antibiotics or other materials for managing blossom blight: Make sure to use these dates in the NEWA fire blight models to increase precision ( ). Make a note on a piece of paper or in note applications on your phone. Keep track of first blossom open dates for each of your varieties, especially those susceptible to fire blight. If you are concerned with carryover inoculum from fire blight last season, consider applying prohexadione-calcium (Kudos, Apogee, etc.) with or without Acibenzolar-S-methyl (Actigard) at pink to slow vigorous tree growth and the migration of infecting bacteria through tissues should infection occur later.įorecasting Infection Events. In Western NY, king bloom could occur this weekend, and it will be important to watch weather forecasts and follow extension specialists’ alerts and fire blight risk predictions. We’re presently experiencing a cold spell for couple of days, but temperatures will be approaching the high 70s/low 80s throughout the State by the end of the week. Temperatures this weekend were in the 80s and risks were “extreme” for plantings of early flowering cultivars. Currently, orchards in the Hudson Valley are in bloom or on the cusp of bloom. Growers need to be prepared to start and finish the susceptible period (from bloom through petal fall) strong with their most effective options. With the early hot spring we are now experiencing right before bloom, we should remain vigilant and prepare for higher risk periods of erratic of hot weather that often end with storms. ![]() Plantings on Long Island and the Hudson Valley were well beyond bloom and able to escape these late May infections. Many growers using strong antibacterial programs until the end of bloom were easily able to manage fire blight while others experienced outbreaks of shoot blight during storms at or shortly after petal fall. There were some outbreaks in Wayne, but the situation was not as dire or widespread beyond the region. Fortunately, for most farms east and of the finger lakes, this period of hot wet weather was too late or not severe enough to lead to infections. This bloom time weather pattern was similar to the previous year and the year prior. These were perfect conditions for fire blight that resulted in systemic shoot blight infections. The season was characterized by cool “low risk” bloom that seemed to linger and exceptionally hot, stormy “high-risk” weather from the end of bloom into petal fall. ![]() In 2022, there were devastating fire blight outbreaks in Finger Lakes region after petal fall at the end of May. Janet van Zoeren, CCE, Lake Ontario Fruit Program, Albion, NYĢ022 fire blight season recap. Līga Astra Kalniņa & Kerik Cox, PPPMB, Geneva, NY
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