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Although other leaf spot and leaf streak diseases do occur on daylilies , it is unclear whether any of these problems are caused by fungi . CAUTION : Read all label directions very carefully before purchasing and again before using an insecticide . Because they bloom fairly early in spring , the trees should not be planted on low sites where cold air may settle . The fungus , unlike many other rust fungi , completes its entire life cycle on one host . Unlike most plant pathogenic nematodes , foliar nematodes live in and feed upon the aerial portion of the plant . Beginning in the fourth year , prune out the oldest wood annually in early spring before growth begins . Most commercially available currant and gooseberry cultivars should demonstrate adequate winter hardiness for our region because they have proven hardy in testing to at least -30 F when fully dormant . It is important to distinguish between the two insects because the Japanese beetle is a serious landscape pest . Because you want your new shrubs to become established before the onset of hot weather , set out either bare-root or potted plants in spring as soon as the soil can be worked ; do not be afraid to plant early in the season , as even a plant that is beginning to leaf out can tolerate temperatures as cold as 19 F. Geranium rust , unlike many rust fungi , completes its entire life cycle on geraniums . Whether the fruiting variety is grafted onto standard or dwarfing rootstock , the fruit size and quality will be the same . Before planting the vine , remove all canes except the most vigorous one . It is unlikely for geranium rust to survive winter outside in Minnesota , but removing infected debris may help prevent infections the following spring . Because currants and gooseberries bloom very early in spring , their flowers are susceptible to late-season freezes ; temperatures below approximately 28 F can cause damage that will significantly decrease yield . The reward , however , is high-quality tree-ripened fruit unlike almost anything one can buy at the grocery store . Soils not within the range of pH acceptability for blueberry plant growth must be prepared BEFORE planting .