Effective control for powdery mildew can only be achieved through preventative means, so treat early in the season before symptoms are observed.Īmerican plum borer were caught in all traps at the NWMHRC with an average of two per trap. We have observed powdery mildew on tarts at the research station. The warm and dry weather puts apples and cherries at risk for powdery mildew infection. Trauma like this predisposes shoots to fire blight infection. Reports of hail elsewhere seem to be isolated. Torn leaves and some potentially damaged fruit has been observed (Photo 2). The NWMHRC experienced 0.5 inches hail for 2.5 minutes Wednesday afternoon, May 31 (Photo 1).
FIRE BLIGHT ON TREES PLUS
To protect against shoot blight infection, three to four applications of 2 ounces Apogee plus 1 ounce Actigard (each per 100 gallons) at seven- to eight-day intervals is also recommended. Late blooming varieties or varieties with tag bloom are still susceptible to blossom blast from fire blight. Areas that received rain with the scattered thunderstorms last Wednesday, May 31, also experienced a cherry leafspot infection event.įire blight. These spores will be ready to infect when rain returns, so tarts should be covered with a protectant fungicide before the next rain event. Spores waiting for dispersal can survive for long periods of time, even in the dry conditions we have experienced. The potential rain later this week and weekend is also an opportunity for infection of primary spores of cherry leafspot. Captan should be avoided if chemical thinners are also being applied on the variety.Ĭherry leaf spot. Apples should be protected with a fungicide in advance of rain. Temperatures have also cooled and are ideal for the viability of scab spores. Some areas experienced an infection event with the scattered storms last Wednesday, May 31. There are chances of rain later this week and into the weekend and primary infection of the apple scab fungus are still can occur after a wetting event. Bartlett and Potomac pears are both 16 mm in size. Montmorency and Balatons are also 12 mm in size. Crop reportĪt the NWMHRC this week, Gala and Honeycrisp are measuring 12 mm. Leaf tear on Gala apple caused by hail at Northwest Michigan Horticulture Research Center. We were concerned about a trauma event for fire blight with these extreme conditions. We can see marks on sweet cherry fruitlets and torn leaves in all tree fruits (Photo 2). The research station recorded 0.36 inches of precipitation in the rain gauge, but unfortunately, some of that moisture came in the form of hail (Photo 1). There was some rainfall last week, and it was tremendously variable throughout the region. Sweet cherries are often the first crop to start to take on that wilty look. Orchards are extremely dry, and growers that do not have irrigation are starting to report flagging and wilting trees. Conditions are extremely dry across the region and the state. The other notable difference in weather is the lack of moisture. The difference in the base 50 is almost 100 GDD from our average to the 2023 accumulations. In 2023, we have accumulated 798 GDD base 42 and 471 GDD base 50 compared with 720 GDD base 42 and 375 GDD base 50.
Also, because of this heat, we have accumulated more growing degree days (GDDs) than our 33-year average. This heat coupled with dry conditions have resulted in drought stressed trees, particularly those without irrigation. Temperatures cooled slightly on Monday, and the high for today, June 6 is predicted to be 73 degrees Fahrenheit. In fact, the Northwest Michigan Horticulture Research Center (NWMHRC) Enviroweather station recorded the high temperatures in the mid-80s from Sunday, May 28, through Sunday, June 4. Conditions have cooled some at the start of this week, which is much welcomed after a week of high 80s and even daytime temperatures reaching into the 90s last week. This trend continued from the previous week, and the forecast for the remaining part of the week into the weekend is predicting much of the same. The weather has certainly been defined by the hot and dry conditions over this past week.
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