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What are the control methods for tea plant purple root rot?
Distribution and symptoms: It is found in all tea-producing areas, but occurs fairly commonly in North China and East China. This disease mainly occurs at the seedling stage and the mature plant stage, damaging the roots or the root collar. First the fibrous roots rot, turning brown or dark brown, then it spreads to the lateral roots, which after rotting turn purplish brown. The surface of the lesions is covered with purplish brown thread-like matter, and on the surface of the diseased roots there are hemispherical granular sclerotia. The base of the small stem plus cm is often surrounded by purplish red mycelium, soft in texture; it peels off easily, and the root cortex also peels off easily. In severe cases the aboveground part wilts, new shoot sprouting decreases, and the diseased plant dies. Occurrence pattern
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What are the control methods for goji berry black fruit disease?
Black fruit disease is one of the main diseases of goji berry. The pathogen harms the green fruit, flowers and buds of goji berry, and also harms young branches and leaves. The disease is most severe in Shandong, Hebei and Shaanxi regions, causing about 50% yield loss, and up to 80% in severe cases. After the green fruit of goji berry is infected, small black spots or black patches or black net-like lines begin to appear. On cloudy and rainy days, the lesions expand rapidly, turning the fruit black and producing orange-red conidial masses, making it unfit for medicinal use. On sunny days the lesions develop slowly, the lesions turn black, and the unaffected parts can still turn red. Flowers infected
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What are the control methods for the red gall midge of goji (Lycium barbarum)?
The red gall midge of goji belongs to the family Cecidomyiidae. The larvae damage the ovary inside the young buds, forming deformed flower buds that cannot bloom. The red gall midge of goji produces about 6 generations a year, overwintering as mature larvae in the soil, pupating in the following spring; adults appear in mid-April when goji buds, and May is the peak period, with eggs laid inside the tops of young buds. The larvae bore into and feed on the ovary, and the infested buds become deformed. Because they cannot bloom, they drop off. In late September, the mature larvae enter the soil to overwinter. The control method is to spray a 50% 1605 emulsifiable concentrate at 1000 times dilution in mid-April,
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Occurrence and Integrated Control Methods of Gummosis in Goji Berry
Brown lesions appeared on the branches and trunks after 15 d, along with a grayish-white mold layer, while no disease developed from the other inoculated fungi. This result is consistent with the findings of the Ningxia Academy of Agricultural Sciences. Based on the field symptom characteristics and isolation results, it is considered that Clonostachys is the pathogenic fungus causing gummosis, while Alternaria and Fusarium are saprophytic fungi of secondary infection. 3 Disease occurrence patterns 3.1 Overwintering of the pathogen and transmission routes In November, diseased goji branches and trunks with lesions were placed on the field surface and in soil at 20 m-30 cm underground respectively, then retrieved in April of the following year for isolation and culture.
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Identification and Control Methods for the Wolfberry Psyllid
Also known as jaundice, it belongs to the order Homoptera, family Psyllidae. The pest's scientific name is PoratriozasinicaYangetLi. It damages crops such as wolfberry (goji) and black nightshade. Pest identification: adults and nymphs pierce and suck sap on the undersides of leaves, tender shoots and buds, causing the plant to decline in vigor and the leaves to turn yellow. The secreted honeydew causes sooty mold on the leaf surfaces below. The adult is about 3.8 mm long, yellow-brown to dark brown in body color, with orange-yellow markings. There is one pair of milky protrusions on the front of the frons; the basal segment and terminal segment of the antennae are black, while the rest are yellow. The femora of the front and middle legs are the same color as the body, while the hind femora are slightly black.
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What are the control methods for powdery mildew in goji berry (Lycium barbarum)?
[Symptom characteristics] It mainly damages the leaves. The leaf surface is covered with white mildew spots (early stage) and powdery patches (slightly later). These white mildew spots and powdery patches are both the symptoms of this disease and the signs of this disease (the pathogen's conidiophores and conidia). In severe cases, the goji berry plant appears entirely white on the outside, which is quite striking. Photosynthesis of the diseased plant is hindered, ultimately causing the leaves to gradually turn yellow and fall off easily. [Pathogen and disease occurrence characteristics] The pathogen is Oidium sp. of the Moniliaceae in the Deuteromycotina. In cold regions, the pathogen overwinters in the soil with diseased debris as the sexual-stage fruiting body, the cleistothecium.
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What are the control methods for the wolfberry psyllid?
The wolfberry psyllid, also called pig-snout honey or jaundice, belongs to the family Psyllidae and is a major pest of the wolfberry (goji). Adults and nymphs damage branches and leaves, sucking sap, which weakens the tree, causes early leaf drop, and seriously affects the following year's yield. The wolfberry psyllid has 4 generations a year, overwintering as adults in bark crevices, wall cracks, soil cracks, dead branches and fallen leaves, and weeds. In late March of the following year, the adults emerge from dormancy, reproduce and cause damage; damage is most severe from June to October, and at the end of October the last-generation adults overwinter. Its control methods are the same as those for aphids.
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Symptom Identification and Control Methods of Rust Disease in Codonopsis pilosula
It damages the leaves. The diseased area on the underside of the leaf is slightly raised, forming the uredinium, which later ruptures and releases orange-yellow urediniospores. The disease is most severe from June to July. Control methods: (1) Clear away withered branches and fallen leaves in winter. (2) During the disease period, spray with a 200-fold dilution of 50% dinitro compound or a 400-fold dilution of 97% sodium dithiocarbamate, once every 7 days, for 2 to 3 consecutive applications.
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Symptoms and control methods of downy mildew in codonopsis (Codonopsis pilosula)
Irregular brown lesions appear on the leaf surface, and a gray mold-like growth (conidiophores and conidia) appears on the underside of the leaves, which can cause the plant to die. Control method: remove diseased plants and fallen leaves and burn them in a centralized manner; during the disease period, spray 300-fold dilution of 40% Shuangyiling or 1000-fold dilution of 70% chlorothalonil, once every 7 to 10 days, for 2 to 3 consecutive times.
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Symptom Identification and Control Methods for Peach Fungal Shot Hole Disease
[Symptoms] When leaves are infected, circular or nearly circular lesions initially appear, with purple edges and slight concentric rings, measuring 1-4 mm in size; later, grayish-brown mold-like growth develops on the lesions, the center dries up and falls out, forming shot holes with neat edges, and when there are many holes, the leaves drop off. When new shoots and fruit are infected, the symptoms are similar to those on leaves. [Disease Development Pattern] [Regional Damage Severity] [Integrated Control] (1) Eliminate the source of inoculum. Promptly prune diseased branches, thoroughly remove diseased leaves, and burn or bury them deeply. Before peach trees bud, spray
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