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Proceedings of Carrot Conference Australia, October 2000.
Planting: Carrots (Daucus carota) are cool-season plants that grow best at average temperatures between 60 and 65 F. The optimum soil temperature for seed germination is 55 to 75 F. Seeds will not germinate above 95 F.
Somatic heart- and torpedo-stage embryos of the domesticated carrot, Daucus carota L., were severed at their midlengths to produce two halves termed apical and basal pieces. These pieces may be grafted or kept separate.
Symptoms: The disease usually starts on the leaf margins of older leaves, causing dark-brown to black spots with yellow borders. The expansion of numerous spots on a leaf will cause chlorosis (yellowing) and eventually necrosis (death) of the entire leaflet.
This Weeks Citation CIassiC~ ~ 1 Halperln W & Wethereil D F. Adventive embryony in tissue cultures of the wild carrot, Daucus carota. Amer. I. Bot. 51:274-83, 1964.
However, it is not clear whether their hybrids are able to survive and reproduce outside managed elds, and if cultivar genes introgress into wild populations.