Broken brocade disease of tulips

Tulip brocade disease is an ancient and famous worldwide virus disease, which occurs in all tulip planting areas. The disease occurs in Shanghai, Beijing, Xiamen, Fuzhou, Chengdu and other cities in China. The broken brocade disease of tulips causes the degeneration of bulbs, the flowers become smaller and the colors of pure flowers become variegated. There is a risk of seed destruction when the disease is serious.

Symptoms: the disease harms the leaves and Corolla of the plant. Light green or grayish white stripes appear on the leaves of susceptible plants, sometimes forming flowers and leaves. Petal deformity, due to virus infection affecting the formation of anthocyanins, light yellow, white stripes, or irregular spots appear on the petals of pure color, most of the Corolla of white flowers known as "broken brocade" do not change color, and a few white flowers become pink or red; the Corolla color of pink and light red strains does not change much; the Corolla of black varieties changes from black to grayish black. Flowers become smaller or do not blossom. The degeneration of the diseased bulb became smaller, and the plant grew poorly and dwarfed.

Pathogen: the pathogen is golden incense broken color virus (Tulipbreakingvirus). The virus passivation temperature was 65-70 ℃, the dilution limit was 0.001, and the in vitro virus preservation period was 4-6 days at 18 ℃. The virus has two strains: virulent strain and attenuated strain. Virulent strains led to discoloration and mottling on leaves and pedicels.

Disease pattern: the virus is transmitted non-persistently by peach aphids and other aphids. Under natural cultivation conditions, double-valve varieties are more susceptible to disease than single-valve varieties. The virus has a wide host range and can harm many kinds of flowers, such as Foster's tulips, sharp tulips, Shandan, Curtis, Wilson's lilies, Korean lilies, evergreen Cape of good Hope and so on.

Prevention and treatment: ① strengthens quarantine to control the development of diseases. China buys many tissue culture seedlings from the Netherlands and other countries every year, and the virus-carrying rate is relatively high, so it is necessary to strengthen customs quarantine and control the spread of diseases. ② established a tulip virus-free mother garden and variety base in order to provide non-toxic seedlings to the whole country. ③ should strengthen cultivation management and control the occurrence of diseases. The plants left in the planting land are often checked and pulled out as soon as the diseased plants are found; the tulip planting plots should be isolated from the lily cultivation plots so as not to infect each other. ④ controls virus-transmitting aphids. Regular spraying of pesticides such as dimethoate and malathion to kill virus-transmitting aphids, it is best to use a repellent.