Yellow King Research Articles

Chromosome Studies in the Genus Alstroemeria

AbstractChromosomes of 11 cultivars of Alstroemeria were studied to determine their somatic constitutions. Two cultivars, ‘Eureka’ and ‘Zebra’, were diploid (2n = 2×= 16), six cultivars, ‘Yellow King’, ‘King Cardinal’, ‘Mona Lisa’, ‘Appelbloesem’, ‘Pink Triumph’ and ‘Rosita’ were triploid with 2n = 3×= 24, one cultivar, ‘Orange Beauty’ was a hypertriploid (2n = 3×+ 1 = 25), one cultivar, ‘Luciana’ was a hypotetraploid (2n = 4×– 1 =31) and one cultivar, ‘Jubilee’, was true tetraploid (2n = 4×= 32). This result suggests that polyploid cultivars may have more market value in this cut flower, Alstroemeria.

Resistance of Canna spp. to the Skipper Butterfly, Calpodes ethlius (Lepidoptera: Hesperiidae) 12

Thirty-nine cultivars of cannas, Canna spp., were evaluated for resistance to the canna leaf roller, Calpodes ethlius Stoll, which causes extensive leaf damage to cannas throughout southern North America, Central and South America, and the Caribbean. The cullivar ‘Wyoming,’ followed in order, by ‘Ambassador,’ ‘Black Velvet,’ ‘Gladside,’ ‘Eureka White,’ ‘Firebird,’ ‘ Freckles,’ and ‘Red King Humbert,’ was the most preferred host for oviposition, whereas ‘La Boheme’ was the least preferred. ‘Wyoming’ sustained the most larval damage, and ‘Crimson Glory,’ ‘Chinese Coral,’ ‘Yellow King Humbert,’ ‘Crimson Beauty,’ ‘Salmon Pink,’ ‘Cherry Red,’ ‘Lucifer,’ and ‘Freckles’ exhibited the least larval damage. Plants with red leaf color were preferred to those with green leaves. Cultivars with yellow, rose red, yellow-red, or pink flowers were least preferred, whereas plants with red, orange, or scarlet flowers were the most preferred oviposition hosts and sustained the highest larval damage even though flower stalks were removed during the oviposition studies.

Resistance of Canna Cultivars to Canna Rust and Hippeastrum Mosaic

Abstract Fifty-two cultivars of cannas (Canna X generalis L.H. Bailey and C. indica L.) were evaluated in a field planting for relative susceptibility to Hippeastrum mosaic (HM), a disease caused by Hippeastrum mosaic virus. The cultivars ‘Mrs. Pierre S. DuPont’ and ‘Pink Gem’ were the most susceptible to HM, while 2 red-leaved cultivars, ‘Wyoming’ and ‘Ambassador’, were highly resistant. Thirty-eight cultivars of cannas grown in containers were evaluated for susceptibility to canna rust (Puccinia thaliae Dietel). The cultivars ‘Halloween’ and ‘Yellow King Humbert’ were highly susceptible to rust, while the most resistant cultivars, ‘Louis Cayeaux’ and ‘La Boheme’, were still moderately susceptible. No single cultivar exhibited good resistance to both HM and rust.