. ^SaP1 Fig. 2.—Calla root rot. grown in rich soil with liberal overhead irrigation are apt to develop a dense mass of succulent foliage which is very susceptible to disease. Root Rot.—Affected plants are much stunted, with yellow, drooping leaves and poor growth. The fungus Phytophthora Richardiae, attacks the feeder roots, which rot from the tips back to the corms with a water- soaked appearance, and finally become hollow tubes. In bad cases the corms are entirely bare of lateral roots (fig. 2), for the latter rot off as fast as they are formed. Sometimes, in growing plants, the rot runs bac
. ^SaP1 Fig. 2.—Calla root rot. grown in rich soil with liberal overhead irrigation are apt to develop a dense mass of succulent foliage which is very susceptible to disease. Root Rot.—Affected plants are much stunted, with yellow, drooping leaves and poor growth. The fungus Phytophthora Richardiae, attacks the feeder roots, which rot from the tips back to the corms with a water- soaked appearance, and finally become hollow tubes. In bad cases the corms are entirely bare of lateral roots (fig. 2), for the latter rot off as fast as they are formed. Sometimes, in growing plants, the rot runs back into the corms from the bases of the side roots, but usually not exten- sively. In the corms the rot is dry and spongy and not of a slimy, soft type. Corms which have been affected in the field may develop the same dry rot in storage, and serious losses to bulb growers occur in this way. Infested soil should be avoided for planting callas but may be used
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Keywords: ., bo, bookcentury1900, booksubjectflowers, booksubjectplantdiseases
