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Trees planted on M.26 generally require staking for the first few years of growth or , on windy sites , for the life of the tree . Research is being done on resistant varieties , but at this point , information on less susceptible plants is mostly anecdotal . Cool picked fruit quickly , placing it in covered containers or closed bags to maintain humidity levels and prevent drying when storing fruit in a frost-free refrigerator . Fruit is produced on one - , two - , and three-year-old wood . In recent years , however , incidents of the disease have been reported from Illinois , Iowa , and Michigan , as well as here in Minnesota . To minimize disease , increase ventilation within the plant by supporting vines on trellises and planting them farther apart in well-drained soil . Within two weeks , a rust-colored pustule containing spores develops in the center of each spot on the lower leaf surface . Dimethoate ( often sold as Cygon 2E ) was a commonly used product for iris borer management , however it was canceled in 2002 and is no longer available . In addition to rain splash and wind , spores can be spread by tools , hands , or clothing . When you dig the soil out of the hole , pile it on a tarp or piece of plywood so it ’ s easier to get it back in the hole . Rose chafers seldom fly over the barrier and onto the plants even though the barrier is open at the top . More people enjoy eating blueberries than growing them , yet blueberries are exceptionally handsome bushes worthy of planting in the home landscape . False Japanese beetles cause most of their damage within a two-week period . By providing proper plant spacing , lowered humidity and good air circulation , the need for chemical controls can be minimized or eliminated entirely . In addition to broad host range , there are few effective nematicides labeled for home use . Apple and pear trees require a site in full sun , so choose a spot where the sun shines directly for at least 8 hours each day . Sometimes , sclerotia can be observed in the soil around infected plants . The spores may rub off on your hand and may blow around in the wind . If environmental conditions are favorable for disease development , the fungus can spread through most of the root system within 7-10 days , causing death of the plant . Remove all soil within one foot of the infected plant , to a depth of one foot . Controlling leaf wetness is n't enough , though ; foliar nematodes are very tolerant of dry conditions , and can remain viable for several years in decaying plant material . Although other leaf spot and leaf streak diseases do occur on daylilies , it is unclear whether any of these problems are caused by fungi .