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The true identity of Mandevilla luetzelburgii (Apocynaceae) is clarified and the new M. bullata, largely misidentified as the former species, is described. Drawings for both species are given and a key for morphologically related species is provided. A lectotype is selected for Dipladenia luetzelburgii Ross & Markgr. Mandevilla bullata is assessed as Endangered (EN) and M. luetzelburgii as Critically Endangered (CR), according to IUCN criteria. Se clarifica la identidad de Mandevilla luetzelburgii (Apocynaceae) y se describe una nueva especie: M. bullata, erróneamente identificada como la especie anterior. Se brindan dibujos para ambas especies así como también, una clave para discriminar las especies morfológicamente relacionadas. Se selecciona un lectotipo para Dipladenia luetzelburgii Ross & Markgr. Mandevilla bullata es categorizada como Amenazada (EN) y M. luetzelburgii como Críticamente Amenazada (CR), según los criterios de la IUCN.

Sundaville is the brand name of a new collection of cultivars of the genus Mandevilla (syn. Dipladenia), with the potential to become a leading vine in the world horticultural market. The research was carried out in order to analyse the growth of Sundaville ‘Pretty Red’ at different values of substrate pH (4.0, 4.7, 5.3 and 5.5). The study shows that flowers appeared after more than six months irrespective of soil conditions. Plants cultivated at pH 4.0 had the longest leaves, but at the highest substrate pH the widest leaf laminae were observed. Regardless of the substrate pH, the diameter of a single flower remained the same. Plants cultivated at a pH lower than 5.0 produced more flower buds and more flowers in comparison with the plants exposed to the higher pH. Moreover, pH < 5.0 positively affected the number of stems. The soil pH did not only affect the growth, but also the health of the plants. The lowest pH level (4.0) caused adverse changes to the leaves.

In 2004, virus-like symptoms consisting of yellow rings in older leaves were observed in the foliage of Mandevilla sanderi grown from shoots in the province of Catania (Sicily, Italy). The plants were tested for virus presence using DAS-ELISA, mechanical inoculations to the host, RT-PCR and SSCP. Serological tests detected Cucumber mosaic virus (CMV) in all symptomatic leaf samples. The virus was mechanically transmitted to 11 of the 15 host species tested, including some species of the Chenopodiaceae and Solanaceae families; indicator plants showed symptoms typical of CMV subgroup I. RT-PCR, SSCP and cloning were employed to characterize this CMV isolate and to make clear its genetic relationship with selected CMV isolates from other Countries. From this analysis, CMV-M. sanderi appeared closely related to AY153419 (CMV-PIM-SP-BR, subgroup IA) (nucleotide identities higher than 98%) from Brazil. The virus was transmitted by sap inoculation to healthy M. sanderi plants. As far as we know, this is the first report of virus infection in M. sanderi and it then appears that this ornamental shrub is a new natural host of CMV [Nel 2004 sono stati osservati sintomi riconducibili a virosi, consistenti in anelli giallastri nelle foglie più vecchie, nel fogliame di Mandevillea sanderi derivanti da talee, in provincia di Catania (Sicilia). Sulle piante sono stati effettuati test per accertare la presenza di virus mediante DAS-ELISA, inoculazioni meccaniche dell'ospite, RT-PCR e SSCP. I test sierologici hanno consentito di diagnosticare la presenza del Virus del mosaico del cetriolo (CMV) in tutti i campioni di foglie sintomatiche. Il virus è stato trasmesso per via meccanica a 11 delle 15 specie ospiti saggiate, comprese alcune specie delle famiglie delle Chenopodiaceae e Solanaceae; le piante indicatrici hanno evidenziato i sintomi tipici del CMV sottogruppo I. Sono state impiegati RT-PCR, SSCP e clonazione per caratterizzare questo isolato di CMV e per chiarire i suoi rapporti genetico con isolati di CMV provenienti da altri Paesi. In base a queste analisi, il CMV-M. sanderi è risultato strettamente affine a AY153419 (CMV-PIM-SP-BR, sottogruppo IA) (identità dei nucleotidi maggiore del 98%) di origine brasiliana. In base alle nostre informazioni, questa è la prima segnalazione di infezione virale in M. sanderi ed è quindi evidente che questo arbusto ornamentale è un nuovo ospite naturale del CMV.]