Jul 11, Leaf rust is most prevalent in areas within the natural range of hemlocks. Control. Plant resistant varieties. Remove all hemlocks within miles of the planting. Apply two to three fungicide sprays from August to mid-September. For current fungicide recommendations, consult your local extension agent or see the Southeast Regional Blueberry.
Jul 26, It also occasionally pops up on blueberry plants in greenhouses. Leaf rust is caused by the fungus Pucciniastrum vaccinii. Yellow spots appear on leaves by mid-season and eventually turn reddish-brown (Photo 1).
On the lower leaf surface, yellow to orange spore pustules (uredia) are present, which may turn rusty red with age (Photo 2).Estimated Reading Time: 4 mins.
Cold damp weather could have contributed to the problem. Leaf rollers and other pests attack plants that are already stressed from other causes. So the first question to ask you is are the plants now growing in a garden that is more shaded than it used to be? If so, that is most likely at least one cause of the rust.
Move the plants into more sun. my sunshine blue blueberry plant has leaf rust, and i checked the undersides of the leaves and its worse than i thought. its affecting 80% of all the leaves! at this point, only 10% are dying, but it has infected nearly the entire plant. its 2 years old and is currently producing its first berries. May 03, “Blueberry leaf rust first appears as tiny yellow spots on the upper surface of young blueberry leaves about 10 days after inoculation” writes Nelson in a plant disease report.
“Spots later turn reddish brown and may be surrounded by a slight yellow shrubdelimbing.buzzted Reading Time: 4 mins. This plant did not get any rust. It did have some stunted growth compared to the other plants, but the foliage was much healthier with a deep, dark, green, and more symmetrical growth. I realize this is a bit anecdotal, but I honestly don't have enough room for all the plant experiments I have dreamed up in my head.