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Stephanie E. Burnett, Bryan J. Peterson, and Marjorie Peronto

panicle hydrangea ( Hydrangea paniculata ‘Grandiflora’) are easy to propagate. Materials and methods Cuttings from five species of plants were propagated in commercial-scale submist and overhead mist systems. On 20 June 2019, tip cuttings were taken from

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Sandra M. Reed and Timothy A. Rinehart

also known by the common name of panicle hydrangea, is native to Japan, eastern and southern China, and Taiwan ( Dirr, 2004 ; McClintock, 1957 ). McClintock (1957) placed H. paniculata in Section Hydrangea Maxim., Subsection Heteromallae Rehder

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Sandra M. Reed

The objectives of this study were to evaluate self-incompatibility in Hydrangea paniculata Sieb. and H. quercifolia Bartr. and to determine optimum time for pollination of these two species. Flowers from three genotypes of each species were collected 1, 2, 4, 8, 24, 48, and 72 hours after cross- and self-pollination, stained with aniline blue and observed using a fluorescence microscope. In both species, pollen germination was observed on stigmas of over half of the flowers collected 4 to 72 hours after cross- or self-pollination. Differences in pollen tube length between cross- and self-pollinated flowers were noted from 8 to 72 hours after pollination in H. paniculata and from 24 to 72 hours after pollination in H. quercifolia. By 72 hours after pollination, most self-pollen tubes had only penetrated the top third of the style but cross-pollen tubes had grown to the base of the style and entered 40% to 60% of the ovules. Stigmas of H. paniculata were receptive to pollen from anthesis to 5 days after anthesis, while stigmas of H. quercifolia were receptive from 1 to 5 days after anthesis. This study provides evidence of a gametophytic self-incompatibility system in H. paniculata and H. quercifolia. Occasional self-seed set previously observed in these species was theorized to have been due to pseudo-self compatibility.

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Amir Rezazadeh, Richard L. Harkess, and Guihong Bi

’ blanket flower [ Gaillardia aristata ( Latimer and Freeborn, 2010 )]. Dikegulac sodium at 800 or 1600 ppm increased branch number of pruned and unpruned ‘Limelight’ panicle hydrangea [ Hydrangea paniculata ( Cochran et al., 2013 )]. The foliar

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Shital Poudyal and Bert M. Cregg

chlorothalonil (0.36 mL·L −1 ) was completely safe ( Vea and Palmer, 2017a ). In a dose-response study including isoxaben (0–1.4 ppm), oxyfluorfen (0–0.02 ppm), and chlorpyrifos (0–0.4 ppm), panicle hydrangea ( Hydrangea paniculata ), silky dogwood ( Cornus