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When temperatures are warm ( 75 F ) and humidity high ( 85 % ) , the fungus will readily produce spores that spread the disease . An average apple contains about 90 calories , and small amounts of vitamin A , vitamin C , thiamine , riboflavin , calcium , phosphorus , and potassium . Pots should be disinfected by soaking in a 10 % bleach solution ( 1 part bleach to 9 parts water ) for 30 minutes . Misapplication of these pesticides has been linked to death of hundreds of songbirds , fish and wildlife . Adequate plant spacing , maintaining the relative humidity below 85 % and providing good air circulation provide excellent control for this disease . If the pH is too high for an extended period of time , the plants will die . If you want to dry , can , freeze and / or press cider from the fruit , you may be able to handle two trees worth of fruit ripening at the same time . These chemicals will kill the beetles present at the time of application , but may not prevent additional rose chafers from attempting to feed on treated plants . Planting time is a good time to install a tree guard to protect your tree from winter injury and bark chewing by small mammals . It is very important to clean your pruner by dipping in 10 % bleach solution or by spraying it with 70 % rubbing alcohol after cutting off diseased plant material and prior to pruning any healthy plants . Soil solarization , a process that heats the soil to levels sufficient to kill many fungi , is a control measure used in the south . Dwarfing rootstocks reduce tree size by up to 75 % , so that a tree may be only 8 , 12 , or 15 feet tall when mature , depending upon its rootstock , scion variety , and growing conditions . At one time Southern blight was thought to be a disease problem only in warm climates .