The biology of Canadian weeds. 117. Taraxacum officinale

] von Hinrichs, G. 1988. Control of powdery mildew on cultivated dandelion (Taraxacum officinale). Nachrichtenbl. Dtsch Pflanzenschutzdienst. (Braunsw.) 40(S): 116–120. von Hinrichs, G. 1989. Bekämpfung des echten Mehltaus an Kulturlöwenzahn. GB+GW 89(31): 1487–1490. [in German.] von Hofsten, C. G. 1954. Studies on the genus Taraxacum with special reference to the group Vulgaria DT in Scandinavia. LTs Förlag, Stockholm, Sweden. 431 pp. [in Swedish, English abstract.] Waddington, J. 1980. Chemical control of dandelion (T. officinale) and perennial sowthistle (Sonchus arvensis) in alfalfa (Medicago sativa) grown for seed. Weed Sci. 28: 164–167. Waipara, N. W., Harvey, I. C. and Bourdôt, G. W. 1993. Pathogenicity of Sclerotinia sclerotiorum on common thistle species and other pasture weeds. Pages 261–264 in Proceedings of the Forty-sixth New Zealand Plant Protection Conference, 1993, Christchurch, New Zealand. New Zealand Plant Protection Society, Rotorua, New Zealand. Waller, G. R., Jurzysta, M. and Thorne, R. L. Z. 1993. Allelopathic activity of root saponins from alfalfa (Medicago sativa L.) on weeds and wheat. Bot. Bull. Acad. Sinica 34: 1–11. Wang, K. and Hiruki, C. 2001. Molecular characterization and classification of phytoplasmas associated with canola yellows and a new phytoplasma strain associated with dandelions. Plant Dis. 85: 76–79. Warmke, H. E. and Warmke, G. L. 1950. The role of auxin in the differentiation of root and shoot primordia from root cuttings of Taraxacum officinale and Cichorium. Am. J. Bot. 37: 272–280. Washitani, I. 1984. Germination responses of a seed population of Taraxacum officinale Weber to constant temperatures including the supra-optimal range. Plant Cell Environ. 7: 655–659. Wassink, E. C. 1965. Some introductory notes on Taraxacum officinale L. as an experimental plant for morphogenetic and production research. Meded. Landbhogesch. Wageningen 65: 1–15. Watanabe, M., Maruyama, Y. and Serizawa, S. 1997. Hybridization between native and alien dandelions in the western Tokai district. I. Frequency and morphological characters of the hybrid between Taraxacum platycarpum and T. officinale. J. Jpn. Bot. 72: 51–57. [in Japanese, English abstract.] Welham, C. V. J. and Setter, R. A. 1998. Comparison of a sizedependent reproductive effort in two dandelion populations. Can. J. Bot. 76: 166–173. Westerman, L. and Roddick, J. G. 1981. Annual variation in sterol levels in leaves of Taraxacum officinale Weber. Plant Physiol. 68: 872–875. Williams, E. D. 1983. Effects of temperature, light, nitrate and pre-chilling on seed germination of grassland plants. Ann. Appl. Biol. 103: 161–172. Williams, C. A., Goldstone, F. and Greenham, J. 1996. Flavonoids, cinnamic acids and coumarins from the different tissues and medicinal preparations of Taraxacum officinale. Phytochemistry 42: 121–127. Wilman, D. and Derrick, R. W. 1994. Concentration and availability to sheep of N, P, K, Ca, Mg and Na in chickweed, dandelion, dock, ribwort and spurrey, compared with perennial ryegrass. J. Agric. Sci. (Camb.) 122: 217–223. Witty G, and Bing A. 1985. Know your weeds. Long Isl. Hortic. News (March), 3–4. Wood–Baker, C. S. 1980. A comparison of Aphis armoraciae Cowen 1895 and A. knowltoni Hottes & Frison 1931 (Homoptera, Aphididae). Entomol. Mon. Mag. 115: 17–19. Zahnley, J. W. and Duley, F. L. 1934. The effect of nitrogenous fertilizers on the growth of lawn grasses. J. Am. Soc. Agron. 26: 231–234. Zaprzalka, J. R. and Peters, R. A. 1982. Growth of dandelion as influenced by lime and fertility levels. Proc. Northeast. Weed Sci. Soc. 36: 29–32.