-
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.
-
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.
-
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.
-
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,
-
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
-
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
-
What are the control methods for the yellow nettle caterpillar on magnolia?
(1) In summer (1-generation areas) and in winter and spring (1-2 generation areas), in combination with pruning and other field operations, cut off or pick off the cocoons. (2) When young larvae are clustered and causing damage, cut off the infested leaves to kill the larvae. (3) Spray 20% diflubenzuron suspending agent or 20% chlorbenzuron No. 3 suspending agent at the young larval stage, or spray Bt emulsion, Bacillus thuringiensis, etc. throughout the larval stage. (4) When necessary, spray insecticides such as fenpropathrin, phoxim, fenitrothion, etc. during the larval stage.
-
Control Methods and Technical Key Points for Diseases of Belgian Azalea
Control of Common Diseases and Pests The physiological disorders among the common diseases of Belgian azalea are mainly caused by differences in water quality between production and sales areas, unsuitable temperatures during transport, or insufficient light when placed indoors at home. The control method is mainly to adjust light, the pH of irrigation water, and temperature according to the physiological habits of Belgian azalea. Common diseases of a pathological nature include: for gray mold, thinning seedlings, reducing humidity, and preserving warmth are the fundamental control measures. For chemical control, iprodione (1500x dilution), mancozeb (500x dilution), procymidone (15
-
What are the common diseases of the tea tree mushroom? Detailed explanation of prevention and control methods
The tea tree mushroom is a rare mushroom variety that has been very popular in domestic and international markets in recent years, but because pest and disease problems occur relatively often, growers often fail to accurately identify the symptoms and pathogens and blindly use chemical pesticides, resulting in damage to the mushroom bodies and poor cultivation returns. The symptoms, pathogens and control measures of common infectious diseases are introduced below: 1. Brown rot disease The affected fruiting bodies stop growing, and the caps and stipes rot and give off a foul odor. The pathogen is Mycogone perniciosa, which mainly spreads and causes disease through contaminated water or hands, tools, etc. that have come into contact with diseased mushrooms
-
What are the control methods for goji root rot?
Goji root rot occurs commonly and causes serious damage; plants killed by the disease account for 3%-5% each year, causing great losses to goji production. According to research by Lu Zhankui and others at the Ningxia Academy of Agriculture and Forestry Sciences, root rot symptoms fall into the following two types: (1) Root decay type. Roots or the root crown show varying degrees of decay and peeling, the stem vascular bundles turn brown, and in damp conditions a white or pink mold layer grows on the diseased area. It can further be divided into two types: small-leaf type and yellowing type. ① Small-leaf type: leaf emergence in spring is delayed, leaves are small, branches are stunted, flower buds and
条件筛选