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Abstract
The growth retardants ancymidol, flurprimidol, and chlormequat chloride were incorporated into plaster of paris tablets and compared to drenches on various plants. Ancymidol tablets were as effective as drenches in controlling height and increasing racemes of Clerodendrum thomasoniae Balf. (southern bleeding heart). Drenches of ancymidol and flurprimidol reduced the height of Lilium longiflorum Thunb. (Easter lily) more than tablets; flurprimidol reduced Lilium height more than ancymidol. Tablets reduced the height of Euphorbia pulcherrima Willd. ex Klotzsch (poinsettia) cvs. Topstar and V-14 Glory, but not C-1 Red. Ancymidol drenches produced shorter ‘C-1 Red’ and ‘V-14 Glory’ plants than tablets. Tablets reduced bract diameter more than drenches. Flurprimidol tablets produced the smallest bracts. Chemical names used: α-cyclopropyl-α-(4-methoxyphenyl)-5-pyrimidinemethanol (ancymidol); α-(1-methylethyl)-α-[4-(trifluoromethoxy)phenyl]-5-pyrimidinemethanol (flurprimidol); 2-chloro-N,N,N-trimethylethanaminium chloride (chlormequat chloride); butanedioic acid mono(2,2-dimethylhydrazide) (daminozide).
Abstract
Passiflora caerulea L., blue passion-flower, has been hybridized with other species to produce hybrids of ornamental value and has been grown as a potted plant. P. edulis Sims, the passion fruit, has handsome 3-lobed leaves and large white ornamental flowers. Both species are large vines that would make interesting potted, patio hanging-basket or trellis plants if their stem elongation could be controlled.
Abstract
Chamaecereus silvestri (Spreg.) Britt & Rose ‘Peanut cactus’, Mammillaria elongata D.C. ‘Gold Star’, and Opuntia microdasys (Lehm.) Pfeiff. ‘Bunny Ears’ were grown on an 8-hr natural photoperiod (short) or an 8-hr natural plus 4-hr incandescent light from 10:00 pm to 2:00 am photoperiod (long) and treated with single sprays of growth regulators. Ethephon or the long photoperiod increased shoots on Opuntia. Gibberellic acid alone or BA alone increased Mammillaria and Chamaecereus shoot number linearly, whereas GA plus BA reduced shoot number. Chamaecereus and Opuntia plants grown on a long photoperiod produced more shoots than plants grown on the short photoperiod. Ethephon reduced the dry weight of all cacti tested. Dry weight of untreated Mammillaria and Opuntia plants exceeded that of growth regulator-treated plants. Opuntia plants produced more dry weight on the long photoperiod than on the short photoperiod. GA increased the growth of glochids on Opuntia and Mammillaria. Chemical names used: A-(phenylmethyl-1H-purin-6-amine (BA); (2-chloroethyl)phosphonic acid (ethephon); and gibberellic acid (GA).
Abstract
An isolate of Thielaviopsis basicola (Berk. & Br.) Ferraris from Ilex crenata Thunb. was highly pathogenic to susceptible hollies while the isolate from Pelargonium × hortorum L.H. Bailey was less pathogenic. Various ratios of pine bark and sphagnum peatmoss did not suppress T. basicola on susceptible hollies. Of the cultivars tested, I. crenata ‘Helleri’ and I. pernyi Franch were most susceptible, while I. aquifolium L. × I. cornuta Lindl. and Paxt. ‘Nellie R. Stevens’, I. cornuta ‘Burfordii’ × I. peryni ‘Lydia Morris’, and I. cornuta ‘Burfordii Nana’ were the most resistant to T. basicola. I. crenata ‘Helleri’, grown in a medium with a pH of 5.0 or 6.0, had less black root rot development than similar plants in a medium with a pH of 6.5.