Detailed explanation of common diseases of Siraitia grosvenorii and their control methods
Siraitia grosvenorii may not be very familiar to everyone, but it can not only be used as a vegetable and stir-fried, its seeds can also be processed into seeds for eating. In addition, Siraitia grosvenorii has very high medicinal value and has a history of consumption in our country for several thousand years. Its cultivation history is also very long, and quite a few people are now growing it, but many pest and disease problems appear during the cultivation process. So what pests and diseases appear? How should they be controlled? Let us take a look below!
1. Gummy stem blight
Disease characteristics: Gummy stem blight mainly damages the leaves, fruits and stems and vines of Siraitia grosvenorii. After the leaves are infected, many yellow streaks appear on the leaf margins, and the streaks are distributed in a "V" shape. Under humid conditions, many black spots appear on the streaks, and these black spots are the spores of the pathogen. After the stems and vines are infected, the symptoms are similar to those on the leaves.
Control methods: When the stems and vines of Siraitia grosvenorii grow to a certain length, carry out one chemical preventive treatment on the stems and vines, then during the 6-8 months of growth, carry out prevention again according to the actual situation, and the dosage of the chemical depends on the growth conditions. Chemicals such as Antaisheng wettable powder can be used for spraying control.
2. Anthracnose
Disease characteristics: Anthracnose is the most troublesome disease among the diseases of Siraitia grosvenorii, and it may occur at the seedling stage and the final mature stage. It threatens all parts of the plant. When the disease develops rapidly, it causes great harm to the fruits and stems and vines, and even directly causes the fruits to rot and fall and the stems and vines to shrivel. After the leaves are infected, many spots appear on the leaf surface, and these spots gradually expand and extend, then slowly merge with each other, forming large patches, causing the leaves to turn yellow, die and then fall off.
Control methods: The occurrence of anthracnose follows a pattern. It is most likely to occur in the month of the seasonal transition between summer and autumn each year, so we should spray an appropriate amount of chemicals for control before this time arrives. After the disease occurs, chemicals such as carbendazim can be sprayed continuously, once a week, and spraying should continue for at least three weeks.
3. Viral disease
Disease characteristics: Viral disease mainly damages the leaves of Siraitia grosvenorii, especially the old leaves. After the old leaves are infected, they begin to shrink and wrinkle at a speed visible to the naked eye. The leaves begin to appear raised and, as if they have lost water, become dry and brittle. In addition, the growth of the branches is also greatly affected, the branches are weak and take on a hanging shape, which hinders growth, reduces the fruit-setting rate of the fruits, and affects yield.
Control methods: The main transmission route of the pathogen of viral disease is aphids, so if we want to control viral disease, we need to control the reproduction of aphids well. Start using chemicals for prevention when the young buds emerge, strengthen orchard management, clean the orchard regularly, promptly remove diseased remains and fallen leaves and fruits from the orchard, and reduce the presence of insect eggs in the orchard. When controlling aphids, a little oligosaccharin and similar substances can also be added to the chemical for spraying to control viral disease. The timing and frequency are the same as for anthracnose control.
The above three diseases are the diseases that often appear when growing Siraitia grosvenorii. If the diseases are not controlled in time, they are very serious for the growth of the plants. However, while controlling diseases, we also need to prevent pests, because pests generally trigger other diseases, so strictly speaking, the harm of pests is greater than that of diseases. Strengthen management, and any abnormal situation must be dealt with promptly. This article is for reference only, and I hope it can help everyone.