Spraying Sulfur for rust… what constitutes “high temps”? My label says not to apply in times of high temperatures, but doesn’t give a range. I am seeing rust spots on pear, Juneberry, currants, and chokecherry. Would Myclobutanil be a better option? Myclobutanil has Juneberry & currants listed for use. Cherries are listed, but not chokecherries specifically, and pears are not listed.