Apricot root rot is a disease that occurs on apricot seedlings and saplings. When seedlings that are bred heavily and apricot seedlings are cultivated between the rows of older apricot trees, serious diseases can occur. The disease has a long incubation period. When the tree vigor is weakened and soil fertilizer and water management cannot keep up with the disease, it is easy to develop. The light affects growth and results, and the severe tree is dead. In addition to harming apricot saplings and seedlings, the disease also harms apple, pear, peach and grape saplings and seedlings. It occurs in both the north and the south of China.
First, the incidence of symptoms Apricot root rot generally began to show symptoms in the early part of May, until the end of August. The disease mostly occurs in the aging apricot garden and in the apricot garden with extensive management and debilitating tree vigor. Apricot root rot pathogens spread through rainwater and soil and invade the fibrous roots first. At the early stage of disease, fibrous roots appear as whitish, round spots. As the disease progresses, lesions increase, connect into pieces, and infect the main and lateral roots. rot. Some new shoots of the diseased plants wilted and drooped, followed by leaf dehydration or scorch, phloem browning, and xylem necrosis, yellowing, or rot. After 3 to 5 days, some or all of the seriously ill trees were blighted and the leaves fell off in advance, and the trees died severely. When occurring in the nursery, the seedlings in the nursery were killed and the seedlings were reduced. In the event that the vigor and conditions of the land and water management are good, the trees will not be affected. Once the tree vigor is weakened and the soil and fertilizer water management technology cannot keep up, disease occurs.
Second, the symptoms of disease Apricot root rot, if the corresponding lesions appear above the ground, then the condition has been very serious, the lesion has spread to the lateral root and part of the main root. In apricot trees with root rot, the aboveground symptoms can be divided into three types:
1 blade focal edge type. Mainly in the new shoots of the year, the tip and edge scorch, the middle of the leaves to maintain normal green, weak tree vigor, slow growth, severe leaves yellow off, but the results are relatively normal, it is not easy to attract attention.
2 wilting type branches. After germination, the growth of the diseased plantlet was normal. However, when the shoot length reached about 10 cm, the leaves became small and pale, and curled upwards. The growing tendency gradually weakened, followed by bending, and the leaves exhibited symptoms of dehydration, withering after 2 to 3 days. death.
3 withered type. Mainly in the high temperature and rainy season, the incidence of rapid. Normal spring shoot growth results are normal, and in the summer high temperature and rainy season, suddenly all die. Many of these occurred in nursery plots and newly planted parks, and the damage was severe. The onset time of the above ground generally starts from early May and continues until late August.
Third, prevention and control technology
1, selected disinfection. Avoid constructing gardens in sticky lands, depressions, and orchards. It is not advisable to raise seedlings between big trees. Before seedlings are planted and planted, they are disinfected and soaked with the agent or soaked in whole plants. The commonly used agents are Baume 4 degrees lime sulfur, 100 to 200 times copper sulfate, and 100 to 200 times 45% aqueous solution of daisoammonium. Soak the seedlings for 5 to 10 minutes and dip the medicines evenly and thoroughly.
2, strengthen management. Improve cultivation conditions, implement grass cultivation, timely watering and timely drainage, prevent water and soil loss, the tree is a reasonable load. Ground plant ash, change the pH of the soil, destroy the living environment of the bacteria; strengthen the prevention and control of pests and diseases above the ground.
3, active prevention. For apricot trees with a history of root rot, they can be rooted with 200 times copper sulfate and other agents from late April to early May. At the same time reduce the amount of results, increase fertilization, strengthen management, enhance tree vigor, and improve the tree's disease resistance.
4, pharmacy irrigation root. For plants that have already developed disease, if they are large trees, drill a groove with a depth of 30 cm and a width of 30 cm under the canopy and put them into the fungicide, then backfill the original soil. If it is a sapling tree, it will be bared with a steel bar in the area of ​​the roots of the tree, deep in the distribution layer of the roots, and pour the medicine into the eyes. The commonly used agents are Baume 2 sulfur, 200 times copper sulfate, 200-fold equivalent Bordeaux or 200-fold 45% desenonium, 15 to 20 kilograms per tree, and 5 to 10 saplings. kilogram. The juvenile trees in the severe wards may be treated with medication in turn, that is, in the middle or late April, the diseased plants were flooded with 200-fold copper sulfate or 200-fold equivalent Bordeaux mixture. After mid-to-late June, 200 times 45% of docosamon sulfate was used to irrigate the roots, and into the high temperature and rainy season, there was a stone-sulfur mixture of 2~4 degrees of Baume, and the treatment was continuous before and after the leaves and in the second spring. .
First, the incidence of symptoms Apricot root rot generally began to show symptoms in the early part of May, until the end of August. The disease mostly occurs in the aging apricot garden and in the apricot garden with extensive management and debilitating tree vigor. Apricot root rot pathogens spread through rainwater and soil and invade the fibrous roots first. At the early stage of disease, fibrous roots appear as whitish, round spots. As the disease progresses, lesions increase, connect into pieces, and infect the main and lateral roots. rot. Some new shoots of the diseased plants wilted and drooped, followed by leaf dehydration or scorch, phloem browning, and xylem necrosis, yellowing, or rot. After 3 to 5 days, some or all of the seriously ill trees were blighted and the leaves fell off in advance, and the trees died severely. When occurring in the nursery, the seedlings in the nursery were killed and the seedlings were reduced. In the event that the vigor and conditions of the land and water management are good, the trees will not be affected. Once the tree vigor is weakened and the soil and fertilizer water management technology cannot keep up, disease occurs.
Second, the symptoms of disease Apricot root rot, if the corresponding lesions appear above the ground, then the condition has been very serious, the lesion has spread to the lateral root and part of the main root. In apricot trees with root rot, the aboveground symptoms can be divided into three types:
1 blade focal edge type. Mainly in the new shoots of the year, the tip and edge scorch, the middle of the leaves to maintain normal green, weak tree vigor, slow growth, severe leaves yellow off, but the results are relatively normal, it is not easy to attract attention.
2 wilting type branches. After germination, the growth of the diseased plantlet was normal. However, when the shoot length reached about 10 cm, the leaves became small and pale, and curled upwards. The growing tendency gradually weakened, followed by bending, and the leaves exhibited symptoms of dehydration, withering after 2 to 3 days. death.
3 withered type. Mainly in the high temperature and rainy season, the incidence of rapid. Normal spring shoot growth results are normal, and in the summer high temperature and rainy season, suddenly all die. Many of these occurred in nursery plots and newly planted parks, and the damage was severe. The onset time of the above ground generally starts from early May and continues until late August.
Third, prevention and control technology
1, selected disinfection. Avoid constructing gardens in sticky lands, depressions, and orchards. It is not advisable to raise seedlings between big trees. Before seedlings are planted and planted, they are disinfected and soaked with the agent or soaked in whole plants. The commonly used agents are Baume 4 degrees lime sulfur, 100 to 200 times copper sulfate, and 100 to 200 times 45% aqueous solution of daisoammonium. Soak the seedlings for 5 to 10 minutes and dip the medicines evenly and thoroughly.
2, strengthen management. Improve cultivation conditions, implement grass cultivation, timely watering and timely drainage, prevent water and soil loss, the tree is a reasonable load. Ground plant ash, change the pH of the soil, destroy the living environment of the bacteria; strengthen the prevention and control of pests and diseases above the ground.
3, active prevention. For apricot trees with a history of root rot, they can be rooted with 200 times copper sulfate and other agents from late April to early May. At the same time reduce the amount of results, increase fertilization, strengthen management, enhance tree vigor, and improve the tree's disease resistance.
4, pharmacy irrigation root. For plants that have already developed disease, if they are large trees, drill a groove with a depth of 30 cm and a width of 30 cm under the canopy and put them into the fungicide, then backfill the original soil. If it is a sapling tree, it will be bared with a steel bar in the area of ​​the roots of the tree, deep in the distribution layer of the roots, and pour the medicine into the eyes. The commonly used agents are Baume 2 sulfur, 200 times copper sulfate, 200-fold equivalent Bordeaux or 200-fold 45% desenonium, 15 to 20 kilograms per tree, and 5 to 10 saplings. kilogram. The juvenile trees in the severe wards may be treated with medication in turn, that is, in the middle or late April, the diseased plants were flooded with 200-fold copper sulfate or 200-fold equivalent Bordeaux mixture. After mid-to-late June, 200 times 45% of docosamon sulfate was used to irrigate the roots, and into the high temperature and rainy season, there was a stone-sulfur mixture of 2~4 degrees of Baume, and the treatment was continuous before and after the leaves and in the second spring. .
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