What about the degradation of tulip varieties?
Imported tulips tend to grow well in the first year, with large flowers and bright colors, but in the second year, the flowers become smaller, the color becomes dim, the leaves and petals appear broken color, and the plant growth is poor. This is mainly harmed by the virus, there are common mosaic virus and broken color virus, so that leaves appear yellow and white stripes and irregular spots, serious leaf decay, flowers and colors produce mottled. Prevention and control methods:
1. When planting, use stem tip to culture virus-free seedlings, or select varieties with strong resistance to virus.
two。 Get rid of weeds in time, spray 1200 times of omethoate or other pesticides, kill aphids, whiteflies and leafhoppers in time, and put an end to the way of virus transmission.
3. Avoid continuous cropping. Planting tulips on the same piece of land for many years has led to the growth of germs and lack of nutrients in the soil. Therefore, it is necessary to replace the land after planting for 2 years at most. Potted plants need to plant new bulbs every year.
4. Strengthen maintenance. In tulip cultivation, such as improper maintenance, affect its growth potential, thus weakening the ability to resist the virus. Therefore, it is necessary to plant according to its growth habits and strengthen maintenance and management.
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Canker of cut tulip flowers
It is mainly spread by bulbs, infecting new buds in the process of tulip germination, causing disease in the aboveground part. The suitable temperature for infection was 10 ℃ ~ 15 ℃, which was consistent with the growth temperature of tulip in the early stage. The disease occurs more frequently during the period from bulb germination to the expansion of the first leaf, which can last until flowering. At the initial stage of the disease, the disease spot on the leaf was waterlogged or gray-white disease spot, and in severe cases, the epidermis was detached from the mesophyll, resulting in cracking to expose the mesophyll, and yellow disease spots were formed on the bulb. Control methods: diseased plants are removed and destroyed in time, and agricultural streptomycin is sprinkled in the surrounding soil.
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Causes of blind branches and blind flowers of tulips
Tulip belongs to Liliaceae, Tulip belongs to perennial bulb herb. It has tall and straight plants, large and gorgeous flowers, and high ornamental value. However, if the nursing is not proper, tulips are prone to blind branches and blind flowers. The symptoms of blind flowers are that the branches and leaves develop normally, the weak ones lose water, the flower buds are white, the leaves are pointed, and the flower stems are atrophied; in the strong ones, the flower stems are short, the petals remain green or white, and curl with stamens and pistils, which can not open completely. Blind branch, that is, the aboveground part of the plant has only one hypertrophic leaf and no leafy branches.
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