-
Symptoms and Control Methods of Brown Spot Disease in the Medicinal Plant Licorice
Licorice, scientific name Glycyrrhiza uralensis Fisch., also known as meicao and micao, is a perennial herbaceous plant in the Fabaceae family. Its roots and rhizomes are used as medicine. It has the effects of harmonizing the middle and relieving urgency, moistening the lungs and detoxifying, and harmonizing various medicines. It is produced in Inner Mongolia, Gansu, Shanxi, Shaanxi, Liaoning, Jilin, Heilongjiang, Hebei and other provinces. The symptoms mainly damage the leaves. The lesions on the leaves are round or irregular, 1-3 mm in size, with a grayish-brown center and brown edges, and grayish-black mold-like substances, namely the pathogen's conidia, grow on both sides.
-
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.
-
Control Methods for the Licorice Flea Beetle (Diorhabda tarsalis)
A leaf-eating pest of the Chrysomelidae family, it is one of the main obstacles to the development of licorice production. It is distributed to varying degrees in the ** Uyghur Autonomous Region, the Hexi region of Gansu Province, and the licorice-producing areas of Liaoning Province, mainly damaging sweet licorice (Glycyrrhiza glabra) and not harming other trees, shrubs, or other herbaceous plants. Throughout the entire growing season, adults are the main agents of damage and consume large amounts of foliage; adults and larvae often overlap in causing damage. In severely affected plots, entire stands of licorice are eaten down to only stems or leaf veins, and from a distance it looks as though the autumn withered and fallen-leaf period has arrived. Try
-
What are the control methods for underground pests of licorice?
The main underground pests at the seedling emergence stage of licorice are mole crickets and the Oriental beetle (He's Oriental chelifer), while at the mature plant stage the main ones are click beetles, scarab beetles, cutworms and darkling beetles, which cause serious damage. After wild licorice is damaged by underground pests, because the wild root head is deep below the soil surface, it is mainly the underground stem that is eaten and damaged, and after damage the adventitious buds can grow rapidly and regenerate, so the whole plant does not die. In contrast, what is mainly eaten and damaged in cultivated licorice is the root, and the plants are young and small with weak recovery ability; accompanied by rot infection, this often leads to the whole plant rotting and dying. In
-
Diagnosis and Control Methods for Acute Onset of Toxoplasmosis in Dogs
From September to December 1997, certain kennels in Jiangsu, Anhui and other places successively experienced outbreaks of a disease characterised by acute death in dogs, sudden acute pulmonary oedema, difficulty breathing, and bloody foam-like fluid flowing from the mouth. Based on necropsy changes, histopathological examination, and toxicological, virological and bacteriological analyses, it was confirmed as an acute outbreak of canine toxoplasmosis. The report is as follows. 1. Incidence: A kennel in Nanjing kept more than 100 German Shepherd Dogs, another kennel kept more than 10 German Shepherd Dogs, and An
-
Detailed Explanation of Control Methods for Two Major Soybean Diseases
Soybean frogeye leaf spot, also known as spot disease, begins infecting pods from the young pod stage, with the seed-filling stage being the peak period of infection, and severe outbreaks occur in July to August when high temperatures and frequent rain occur. It mainly damages leaves; when severely affected, almost all leaves become covered with lesions, causing premature leaf drop, reducing soybean quality and cutting yields by 20%-30%. This year, the hot and rainy climate in many parts of our province is highly favorable for the disease to occur, and the author reminds soybean farmers that they must not neglect the control of soybean frogeye leaf spot. Chemical control: During the flowering and podding stage of soybean, use 50% carbendazim
-
Identification and Control Methods for Southern Blight in Carnations
[Distribution]Shanghai, Hangzhou. [Symptoms]The disease occurs at the base of the stem near the soil surface, turning brown and rotting; when the diseased stem tissue is cut open, a tea-brown or dark brown rot develops from the outside toward the center; the xylem also discolors upward, and white mycelium growing in a feathery, radiating pattern can spread to the surrounding soil surface; afterward, on the diseased area and the surrounding soil surface mycelium, sclerotia form that are initially white and later turn yellow-brown, the size of rapeseeds; after a plant is infected, it usually collapses and dies as a whole. On cutting beds, wet rot begins at the callus formation area of the cuttings and can also cause severe root
-
Symptoms and Control Methods of Carnation Vein Mottle Disease
[Pathogen] Carnation vein mottle virus (CaVMV). Thermal inactivation point 60-65°C. [Symptoms] Affected plants show numerous chlorotic spots and mottling on the leaves, presenting systemic mosaic symptoms; dark green spots are especially visible on the veins of young leaves, and symptoms are often masked on old leaves in winter. Affected flowers develop color breaking and are sometimes distorted and deformed.
-
Symptom Identification and Control Methods of Carnation Viral Diseases
Carnation viral disease is a worldwide disease, occurring in all cultivation regions. The common viral diseases are vein mottle disease, necrotic spot disease, etched ring disease, and latent disease. Viruses often cause carnations to grow weakly, with short flower stems, smaller flowers, mottled petals, and split calyces, severely affecting the quality and yield of cut flowers. (1) Carnation necrotic spot disease: the middle leaves of infected plants turn grayish-white, showing pale yellow necrotic mottling, or irregularly shaped streaks or stripes. The lower leaves often show purplish-red streaks or stripes. As the plant
-
Symptoms and Control Methods of Carnation Wilt
[Symptoms] The external symptoms of this disease are very similar to those of Fusarium wilt. The leaves of affected plants turn grayish-green, then yellow, and dieback of the shoot tips occurs. The stems split, causing the plants to wilt and die. When the central column (stele) is examined, yellow to light brown stripes can be seen. While the aboveground parts are affected, the roots also disintegrate accordingly. The onset of the disease can be divided into two types: the acute type develops very rapidly, and is especially pronounced when young plants in hotbeds are affected; when the damage is mild, the leaves appear twisted. [Pathogen] Pseudomonas caryophylli
条件筛选