Mosaic disease of calla lilies
[distribution] it is very common in Shanghai, and it occurs in Beijing, Xiamen and other places. In addition to harming calla lilies, it also harms plants of the family Araceae such as evergreen and taro. [symptoms] typical mosaic symptoms, high temperature season occult disease; infection of the whole plant, the leaves of the diseased plants shrink, and the leaves produce yellow-green uneven mosaic markings along the veins, or yellow stripes. The leaf is deformed, the Corolla is small, and even can not spread normally. Colored varieties sometimes produce markings on flowers. [pathogen] the pathogen of horseshoe lotus mosaic disease is taro mosaic virus dasheenmosaicvirus,DMV), and the lethal temperature is 60-65 ℃. The virion is filamentous and its length is 700nm to 730nm. Cucumber mosaic virus CMV. [route of transmission] the infected rhizome is the source of infection. General crops and weeds and other poisonous plants can also transmit the virus through aphids. Cutting the cutting edge of flower stem and rhizome can also spread poison. Invade the host from a minor wound. The rhizome of diseased plant is the most important source of primary infection because calla lilies are propagated in separate roots. [incidence regularity] the juice of horseshoe lotus leaf disease could be transmitted, and the peach aphid could be used for non-persistent transmission. [control methods] 1. It was found that the diseased plants were removed in time, and some mildly diseased plants could not be used as reproductive maternal parents. Where possible, virus-free seedlings are produced by heat treatment and stem tip detoxification. two。 Cut flower tools should often be sterilized with alcohol to avoid sap transmission. 3. Pay attention to the control of aphids and other poisonous insects. During the damage period, 40% omethoate 1000-1500 times or 2.5% deltamethrin EC 4000-10000 times can be sprayed.
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Control methods of leaf spot of Zantedeschia mandshurica
First, symptoms infected leaves produce light brown to yellowish brown spots, mostly round, oval or irregular. A few diseases have inconspicuous wheel lines. In the later stage of the development of the disease, many black dot-like molds were produced in the center of the disease spot, that is, the conidia of the pathogen. Second, the pathogen and the disease.
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Control of common diseases and insect pests of calla lotus
1. Disease 1. Calla lily soft rot: the soft rot detached from the plant near the surface, causing the leaves to wither upward, the succulent tubers to produce bony soft rot on millet, the roots also rotted, and the whole plant suddenly wilted and died. The edge of the leaf is damaged and becomes soft and wet-rotten. The pedicel is infringed, the flower turns brown, the pedicel is soft and rotten.
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