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Susceptible flowers include aster , chrysanthemum , cockscomb , coreopsis , cosmos , daisy , dianthus , echinacea ( coneflower ) , gladiolus , marigold , petunia , and phlox . If the graft union is placed close to or below the soil line , the scion will take root , causing a semi-dwarf tree to grow to full size . Training primarily consists of bending young , flexible branches that are growing vertically into more horizontal positions , toward an optimal 60 degree angle from the main stem . What are the effects of scattering and penetration on the fidelity of interferograms , and how does this depend on radar frequency ? When temperatures are warm ( 75 F ) and humidity high ( 85 % ) , the fungus will readily produce spores that spread the disease . Currently labeled fungicides include chlorothalonil ( Daconil 2787 ) , Bayleton , and thiophanate-methyl ( Cleary 's 3336 ) . Hosts commonly include , but are not limited to : begonia , carnation , chrysanthemum , cyclamen , geranium , impatiens , marigold , petunia and zinnia . In addition to rain splash and wind , spores can be spread by tools , hands , or clothing . In regions characterized by persistent cloud-cover ( e.g ., boreal regions , tropical forest and much of Northern Europe ) , SAR may be the only viable alternative for classification of actual land-cover .