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Symptom Identification and Control Methods of Spruce Bud Rust
Spruce bud rust is a newly discovered disease in the forest regions of northern China. It has been reported in the natural forest areas of the Greater Khingan and Lesser Khingan Mountains. Abroad, it is mainly distributed in countries such as the United States, Canada and Sweden, where it damages white spruce, black spruce and Norway spruce. It harms the terminal buds and lateral buds of seedlings, saplings and mature trees, seriously affecting seedling quality and the normal growth of plantations. Symptoms appear in late May when new leaves begin to grow. During the same period, diseased buds grow faster and longer than healthy buds, but soon stop growing. The diseased leaves growing from diseased buds
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Symptom Identification and Control Methods of Spruce Snow Mold
[Distribution and Damage] This disease occurs in North America, Northern Europe, Japan and other countries, damaging tree species such as fir (Abies), spruce (Picea), and Japanese cedar (Cryptomeria fortunei). In China**, it is distributed in the western Tianshan Mountains, the western Junggar Mountains, and the Altai Mountains and other forest areas. The main affected areas include Gongliu, Yining, Tacheng and other places. In severely affected nurseries, the annual loss rate is 33-62%. In artificially regenerated young forests, this disease is also very serious, especially when using small seedlings, weak seedlings, and diseased
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How to prevent and control spruce snow blight? A detailed guide to practical methods
Snow blight damages spruce needles, turning diseased needles reddish-brown. Snow blight develops under snow; ascospores invade spruce needles covered by snow, mature each year from September to October, and then spread by wind and rain. Observations show that in young stands after artificial regeneration and reforestation, the dense planting of the past created a "hand-in-hand" situation, and once the disease breaks out it spreads especially severely; after half of a plant's needles are infected, lose their green color and turn reddish-brown, the entire plant dies. The uncrowned regeneration land at Tekes Forest Farm covers nearly 2666 hectares. In order to ensure the
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Symptom Identification and Control Methods for Spruce Snow Blight
[Distribution and Damage] Abroad, it is distributed in North America, Northern Europe and Central Asia, damaging Norway spruce (Picea abies), white spruce (P. glauca), black spruce (P. mariana), etc. In China, it is distributed in the Tianshan Mountains, the Altai Mountains, the western mountains of the Junggar Basin and the Kunlun Mountains. It damages Schrenk spruce (P. schrenkiana), Siberian spruce (P. obovata), Qinghai spruce (P. crassifolia) and Sichuan spruce (P. balfouriana).
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Identification and Control Methods of the Spruce Cone Moth
Spruce cone moth [Cydiastrobilella (Linnaeus)], also known as the spruce cone leaf roller, belongs to the order Lepidoptera, family Tortricidae. In China it is distributed in Heilongjiang, Inner Mongolia, Shaanxi, Gansu, Ningxia, Qinghai, ** and other places, mainly damaging spruce and larch. Damage characteristics: the larvae damage cones and seeds; infested cones become curved and exude resin, and after falling the cone scales often do not open. Morphological characteristics: the adult is about 6mm long, with a wingspan of 10-13mm. Head, thorax and abdomen are grayish black. The labial palps project forward and curve slightly upward,
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Identification and Control Methods of the Spruce Tortrix Moth
The spruce tortrix moth [Archipsoporanus (Linnaeus)], also known as the pine bud tortrix and the pine thick tortrix, belongs to the order Lepidoptera, family Tortricidae. In China it is distributed in Heilongjiang, Liaoning, Central China, South China and other places, and can damage slash pine, loblolly pine, masson pine, Korean pine, spruce and Chinese juniper. Damage characteristics: the larvae bore into axillary buds, flower buds and male flowers, and gnaw on needles, affecting tree growth and seed yield. Morphological characteristics: adult body length 10-12mm, wingspan 22-30mm. Male moth
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Identification and Control Methods of the Spruce Root Bark Beetle
The spruce root bark beetle (Hylastes cunicularius Erichson) belongs to the order Coleoptera, family Scolytidae. In China it is distributed in ** and Sichuan, mainly damaging spruce, and is especially severe on artificially regenerated seedlings. Damage characteristics: it feeds on the roots of spruce seedlings and attacks freshly cut stumps. Morphological characteristics: adult body length about 4.5mm, dark brown, slightly glossy, with sparse bristles. The frons is narrow and long, covered with flat, shallow, dense punctures each bearing 1 hair; the lower half of the frons is low and flat, the upper half protrudes
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Symptoms and Control Methods of Spruce Leaf Rust
Spruce leaf rust is distributed in Sichuan, Yunnan, Gansu, Qinghai, **, Taiwan, China and other places. The disease damages Picea likiangensis, Picea asperata, Picea crassifolia, Picea brachytyla var. complanata, Picea linzhiensis, Picea schrenkiana and Picea obovata, etc. Symptoms: When buds are infected, the needles on the newly grown tender shoots turn yellow or orange-yellow, short and thick; orange-yellow cushion-like telia or blister-like aecia are produced on the diseased leaves; the diseased buds resemble a yellow flower, and soon the diseased leaves turn black and die. On infected 2-year-old leaves, parts turn yellow, and blister-like aecia or orange-yellow cushion-like
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Symptoms of Spruce Snow Mold and Its Control Methods
Spruce snow mold is mainly distributed in some countries north of 40 degrees north latitude, where it damages tree species such as Japanese cedar, fir and spruce. In China, this disease has only been found damaging **spruce. Symptoms: after the above-ground parts of the whole plant and the needles are infected under the snow, they are covered with a grayish-brown mycelial layer, or the mycelium invades the interior of the host, causing the tree to become moldy and rot and to suffocate. In mild cases, the mycelial layer is cottony; in severe cases, it is felt-like. Its color is brown in the early stage, and white and grayish-brown when the snow is about to melt. When the disease is mild, the damage is distributed in clumps. When severe, the trees fall over in rows.
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Symptom Identification and Control Methods of Spruce Rust Disease
Spruce rust disease is distributed only in the **Tianshan region. The disease has a high incidence rate, but few diseased cones. Infected cones stop growing and quickly die. Symptoms: The disease affects the scales of both female and male cones. Infected female cones are slender and small, curved, with open scales; the bracts become lanceolate, and the cones turn yellow and stop growing. The scales are small, yellow, and bear orange-red protruding telial pustules. Pathogen: The pathogen is Chrysomyxa deformans (Diet.) Jacz.
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