The symptoms of passion fruit virus disease are mainly in the leaves, which are generally streaked, and the damaged leaves are yellow-green uneven. The surface of the leaves is uneven, shrunken or deformed, and the color of the new leaves becomes yellowish. Short, falling flowers, the quality of the fruit is deteriorated and the production will be reduced. The severely affected people will stop growing and even die. Depending on the type of virus, cultivar and environmental factors, the symptoms are not the same, especially in the field, the complex infection is quite common, and there are symptoms of complication. Passion fruit virus pathogen: viruses that contain passion fruit include passion fruit lignification virus, courgette mosaic virus, passion fruit streak virus and passion fruit mosaic virus. 1. Passion fruit lignification virus: When infected, the leaves of Passion fruit appear systematically embedded and shrunken, and the fruit is lignified and severely deformed. The virus can be transmitted via grafting and aphids. 2, courgette mosaic virus: When infected with virus, the leaves appear yellow spots, the fruit hardens and shrinks, the virus can be non-sustained through aphids. When infected alone, only mild symptoms appear. If combined with other viruses, it often causes more serious damage than when it occurs alone. 3. Passion fruit streak virus: When infected, the leaves of Passion fruit have no obvious signs, smooth and no shrinkage, and have little effect on the fruit. There will be yellow-green unevenness in the fruit peel. The growth potential of passion fruit plants after infection is gradually weakened. The virus can be transmitted non-sustainably through seedlings, machinery and aphids. 4. Passion fruit mosaic virus: When infected, the leaf surface of passion fruit is slightly curled, and the shape and coloration of plants and fruits have no obvious effect. The occurrence of passion fruit virus disease In the high temperature and drought period of the passion fruit virus disease, the insect vector occurred seriously, causing the disease to spread rapidly. Tillage advice suggests that preventive work should be done regularly before the occurrence of pests, and pest control should be done in time to prevent pests from carrying viruses outside the orchard. Most of the virus fruit is a perennial seedling. Some of the viruses will be present at the end of the year when the orchard is planted. In winter, it is easy to infect the virus, and the orchard with extensive management and insect pests is more serious. In spring, aphids, thrips, aphids and other pests become active, and the virus is transmitted and spread rapidly. Most of the plantings are cutting seedlings, which have a high risk of poisoning. In addition to the poisoning of the seedlings themselves, they can also be transmitted by the host of the Solanaceae virus in the natural environment. High temperature has an inhibitory effect on certain viruses, so the symptoms of the virus are more likely to manifest in the spring and autumn. When the nutrient conditions are good, the foliage is performing well. When the flowering results are reached, the nutrition can't keep up, and the virus symptoms begin to appear. Passion fruit virus disease control method Passion fruit virus disease can not be applied to the prevention and treatment of pesticides, but because it can be transmitted by insects, the management focus is on insect control and avoiding artificial transmission. 1. Plant healthy seedlings and strengthen seedling management. 2. Strengthen the health management of the park, thoroughly remove the diseased tissues, and do not leave the diseased tissues in the garden and around to reduce the source of infection. 3. Hang yellow sticky board in the orchard for trapping and monitoring. When the density of the insect population is high, it must be matched with the chemical to control the vector insects, which can reduce the chance of transmission. 4, pruning, pruning tools, after disinfection, and then trim another plant, to avoid the use of tools to spread the source. 5. Remove weeds in the field, reduce insects' protection and reproduction, and reduce the chance of transmission and infection. 6. Cultivate and plant disease-resistant passion fruit varieties. 7, rationalized fertilization, strengthen the plant to enhance disease resistance 8, cultivation advice recommended in the early stage of the disease and early onset of spraying 2% Ningnanmycin water 200~260 times solution, or 20% virus A wettable powder 400~ 500 times liquid, or 0.5% anti-toxic agent No. 1 water agent 250~300 times liquid spray control.