-
What are the control methods for cherry root gall disease?
The gorgeous cherry blossom is deeply loved by people, but it is prone to a deadly root gall disease. This disease mainly occurs on the roots and on the trunk and side branches of the aboveground part of the cherry tree. In the early stage of the disease, the root crown swells into spherical or hemispherical tumor-like growths; young galls are white, soft in texture, and smooth on the surface. Later the galls gradually enlarge, become hard in texture, brown or dark brown, with a rough, cracked surface, and spread gradually from the root crown to the main root, lateral roots, and even fibrous roots, with each node swelling into tumors of varying sizes, causing the cherry tree to grow slowly or even stop growing, and the whole tree dies within 3 to 5 years
-
Symptoms and Control Methods of White Root Rot in Cherry Blossoms
Symptoms White root rot has become increasingly severe in damaging garden trees in recent years, especially in cherry blossoms. The disease mainly occurs on the roots of trees. After the fibrous roots are infected, it gradually spreads to the lateral roots and the main root. Its characteristic symptom is a layer of grayish-white silky mesh covering the diseased roots; afterward the roots rot, causing the cortex to separate, and the root absorption function is severely lost. In mild cases, the cherry blossom grows poorly and the tree vigor weakens; in severe cases, it causes death. Pathogen and disease pattern The pathogen is Dematophora necatrix Harting, and its sexual stage is the rare Rosellinia necatrix. This fungus also infects many plants such as poplar, willow, ginkgo, paulownia, wintersweet, crabapple, mountain peach, tea, spruce, cedar, flowering almond, tree peony and Chinese peony. The pathogen overwinters as mycelium, rhizomorphs and sclerotia in the soil or in diseased plant residues. White root rot is a soil-borne root disease, and its infection cycle is not obvious. In April-May of the following year, under conditions of abundant rain and moist soil, the rhizomorphs spread and transmit through the soil. The pathogen can invade through wounds and lenticels on young roots. Generally, trees planted in poorly drained, weak-growing and waterlogged low-lying land are more severely affected. In the Beijing area, white root rot occurs severely from July to August; later, small black dots, which are the pathogen's perithecia, grow on the mycelial membrane.
-
Medicinal Plant Notoginseng (Tianqi) Fusarium Root Rot Explained in Detail
The scientific name of notoginseng is Panax notoginseng (Burk.) F.H.Chen, with the synonym Panax pseudo-ginseng Wall. var. notoginseng (Burkill) Hoo & Tseng. Also known as tianqi. It is a perennial herb of the Araliaceae family, using its rhizome, flowers and leaves as medicine, and has the functions of invigorating blood and removing stasis, reducing swelling and relieving pain, stopping bleeding and lowering blood pressure. It is a specialty of Guangxi and Yunnan in China, and in recent years many counties south of the Yangtze River and in Guangdong also produce it.
-
What to do when the medicinal plant Panax notoginseng gets root-knot nematode disease
Symptoms After the roots of Panax notoginseng are invaded by nematodes, the root cells are stimulated by the nematodes and produce tumor-like galls of varying sizes. Both the main root and lateral roots can become deformed and form galls. The small ones are 1-2 mm, and the large ones can turn the entire root system into a single tumor-like mass. After being infected for a longer time, the plant's branches and leaves turn yellow or fall off. Pathogen Meloidogyne incognita (Kofoid et White) Chitwood, called the southern root-knot nematode. The pathogenic nematode is sexually dimorphic, and the larvae
-
Why should the roots of Schisandra chinensis be pruned before transplanting?
The benefit of pruning the root hairs of Schisandra chinensis seedlings before planting is: after the roots are cut, the seedlings can be stimulated and encouraged to generate and grow new roots. The length of the roots left after cutting is generally best kept between 10-12cm; seedlings with roots shorter than 10cm should also be trimmed so as to promote the growth of new roots.
-
Key Technical Points for Planting Birchleaf Pear Rootstock Seedlings in the Rainy Season
Birchleaf pear (Pyrus betulifolia) is an excellent rootstock for grafting pear cultivars, being drought-resistant, cold-resistant and tolerant of poor soil. It is generally planted in spring and autumn, but in remote mountainous areas short of water, the difficulty of transporting water and spring drought often affect the survival rate of planting. Fruit growers in our region have experience with planting birchleaf pear rootstock seedlings in the rainy season, which gives a high survival rate, rapid orchard establishment and low cost. The specific methods are as follows. 1 Plant after the continuous rainy season arrives, when the underground water content is close to saturation; planting in the rain or rushing to plant before the rain is best. 2 Dig up birchleaf pear sucker seedlings from nearby hillsides; generally a seedling diameter of 0
-
How to prevent and control soybean phytophthora root rot? Detailed explanation of occurrence patterns and control methods
After soybean phytophthora root rot was introduced into our prefecture with the transfer of soybean seeds in July 2005, our station immediately established a soybean phytophthora root rot monitoring leading group and dispatched professional and technical personnel to carry out field monitoring work in Gongliu County. 1. Disease investigation In 2005, the affected area was 2239 hectares, and in 2006 the affected area was 2858 hectares. 1. Disease situation in Xinyuan County The soybean planting area was 0.67 million hectares, the investigated area was 0.3 million hectares, and the affected area was 0.23 million hectares, of which the sporadic occurrence area was 0.2
-
Occurrence and Control Methods of Root Rot in the Medicinal Plant Licorice
Symptoms The disease mainly affects the rhizome and roots. After infection, the stems and leaves of the aboveground part gradually turn yellow and wither, and the rhizome becomes yellow-brown to dark brown, sunken and rotten. The pathogen Fusarium sp. is a species of Fusarium, belonging to the Deuteromycotina fungi. For the morphological characteristics of the pathogen, transmission routes, disease conditions, and control methods, see Astragalus Root Rot.
-
How are potato roots distributed? Understand it in one article
The roots of potatoes grown from tubers are fibrous roots, with no taproot; potatoes grown from seed have a primary root and lateral roots, and here we mainly discuss the fibrous root system. Potatoes are a shallow-rooted crop, with most of the root system distributed within 40 cm below the soil surface, generally not exceeding 70 cm, and in sandy soil the roots can reach more than 1 m deep. The root system of early-maturing varieties is generally less developed than that of late-maturing varieties, and early-maturing varieties have a shallower root distribution, while late-maturing varieties have a wide and deep distribution.
-
Symptoms, Identification, and Control Methods of Root Rot in Dianthus
Identification points: Dianthus root rot mainly affects the root system. After the plant is infected, its growth becomes weak, there are very few fibrous roots on the diseased plant, and the leaves wilt. In severe cases, the root system turns entirely brown, rots, and the root cortex peels off easily, and the whole plant withers. Occurrence characteristics: The pathogen belongs to the Pythium group. This fungus survives on plant residues in the soil and is an important soil-borne fungus that can harm many kinds of plants, causing Pythium root rot. The disease is severe when the soil or growing medium is slightly alkaline and humidity is high. Under conditions such as being placed too densely, excessive watering, and poor ventilation, it is also prone to
条件筛选