Additional ornamental flowering plants naturally infected with California aster yellows

Abstract

Compo sitae : Ohrysanthemum carinatum L.,• tricolor chrysanthemum; annual; variety Dwarfed Golden Queen Ch'rysanthemum segetum L., corn-marigold; annual; varieties Single Eldorado (Severin and Freitag, 1934) and Single Star Chrysanthemum segetum L. x C. carinatum L., single yellow daisy; annual Ohrysanthemum fruiescens L., * Marguerite; perennial Budbeokia hirta L.,* black-eyed Susan; annual or biennial H elianthus annuus L., common garden sunflower; annual Cosmos bipinnatus Cav.,* common cosmos; annual; varieties Giant Pink and White Zinnia elegans J acq., common zinnia, annual; varieties Dahlia-flowered mixed, Double Giant Pink, and Lilliput Scarlet Gem (Severin and Freitag, 1934) Coreopsis Drummondii Torr. & Gray, golden wave coreopsis; annual Coreopsis grandiflora Nutt., bigflower coreopsis; annual Brachycome ib eridifolia Benth.,* Swan River daisy; annual Oallistephus chinensis N ees, * China aster (Severin, 1929); annual Tagetes erecta L.,* African marigold (Severin and Freitag, 1934); annual Tagetes patula L., French marigold, dwarf type (Severin and Freitag, 1934) ; annual Gaillardia pulchella Foug. var, Picia Gray, gailliardia or blanket-flower; annual Calendula officinalis L., * pot-marigold; annual; varieties Lemon Queen and Winter Queen Helichrysum bracteatum Andr., strawflower (Severin and F'reitag, 1934); annual Oentaurea americana N utt., basket-flower; annual Oentaurea Cyan/us L.

Detection and identification of phytoplasmas in yellows‐diseased weeds in Italy

“…These results show that pot marigold is a natural host of the AY phytoplasma. This confirms the report of Severin & Freitag (1945) from California. Recently, Guglielmone et al (1994), using the leafhopper Macrosteles quadripunctulatus as vector, studied the experimental host range of a phytoplasma of a European strain of the AY phytoplasma (Minucci et al, 1992) that was obtained from lettuce in northern Italy.…”

“…The symptoms observed on diseased bristly oxtongue, pot marigold and blueweed plants were similar to those previously reported by other researchers from various geographic areas including Italy (Frazier & Severin, 1945;Severin & Freitag, 1945;Schmelzer, 1960;Ragozzino et al, 1977;Arzone et al, 1995). On field bindweed, stunting and yellowing symptoms were observed as described by Maixner et al (1995).…”

Some experiments and considerations on the identification of witches' broom viruses, especially in clovers, in the Netherlands and Italy

“…Symptoms were indistinguishable from those observed in naturally infected plants as described by Bos (1957a), and from those obtained after artificial infection with the Dutch virus isolate from red clover by EVEN-HUIS (1958) and with an Italian isolate from white clover (Fig. These aberrations were similar to those depicted by SCHMELZER &~ SCHMIDT (1960SCHMIDT ( , 1961 t'or naturally infected plants in Eastern Germany and by SEVERIN • FREITAG (1945) for aster yellows in garden nasturtium. These aberrations were similar to those depicted by SCHMELZER &~ SCHMIDT (1960SCHMIDT ( , 1961 t'or naturally infected plants in Eastern Germany and by SEVERIN • FREITAG (1945) for aster yellows in garden nasturtium.…”

Efecto de antioxidantes y señalizadores en plantas de papa (Solanum tuberosum L.) infectadas con Candidatus Liberibacter solanacearum bajo condiciones de invernadero

“…Otro problema sanitario es el Amarillamiento del Psílido (AP), ocasionado según algunos autores por la inyección de toxinas que realiza el psílido Bactericera cockerelli Sulc. al alimentarse de la planta (Severin, 1940;Wallis, 1948;Liu et al, 2006), aunque hasta la fecha no se ha realizado la descripción bioquímica de esas toxinas.…”