Pomelo root rot disease
2019-12-30 15:08:45
To prevent the acute death of grapefruit, we must grasp it from the beginning of winter, and other diseases are too late.
Pomelo root rot disease mainly occurs in the summer and autumn rainy season. The onset occurred mainly in the cortex and pomelo roots in the main circumcision site, and the epidermis was black at the site of the disease and smelled bad. Pomelo rot roots were examined under a microscope: Pathogens were "scytheid, filamentous mycelium fungi, and spores." Soil pH values ​​were determined to be 5-6 strong, resulting in strong soil acidity. The sick and dead fruit trees have become fine and rainy, their branches and leaves have died, and they cannot survive, digging and replanting.
Cause of the disease: After investigation, a soil type virus field, 35 cm deep soil acid back. Second, well-drained and low-lying drainage The incidence of orchards is high. 3. Spray paclobutrazol over the grapefruit orchard, and then use the girdling method to inhibit the normal growth of the plants. The chlorophyll production from the leaves cannot be smoothly transferred to the roots. Fourth, improper use of chemical fertilizers, urea, etc. caused by rot and root death. V. Early results The girdling of the young tree was too low to the grafting place, causing the sapling to die. Sixth, there is no decomposed organic fertilizer can also cause death or debilitating tree vigor. In seven, circumcision wounds large hanging fruit for many years early grapefruit girdling, the winter temperature is fickle, can not resist the cold and cold, pericyclic wounds in the spring shoot grapefruit spit can not heal the fruit tree mortality is higher.
Main technical measures and prevention methods of healthy plants:
First, the winter cultivating weeds, whitening and sterilizing, the pomelo tree does not plunge deeper in the fruiting period, and the roots can only be ploughed and weeded in the periphery of the canopy to maintain the pomelo tree's robust growth.
Second, each strain grapefruit lime 0.5-1 Jin is appropriate, not excessive, otherwise it will cause boron deficiency.
Third, the use of calcium, magnesium phosphate fertilizer per plant 5-6 kg, conditions can increase the use of plant ash and other transformation of acidity.
4. After discovering dead fruit trees, exhumation and replanting, and excavating diseased plants and nearby contaminated soil, Sie Lisan can be used to disinfect the roots of the seedlings in the cave or in the soil.
Five, Jianmiao prevention with the US-Fomemi 500 times Irrigation root; with enemy pine powder 800 times or 1 to 1 to 10 Bordeaux mixture, 70% thiophanate 100 times solution coating, spread the soil before the first coating The roots and rings are rotted and the decayed skin is scraped off with a knife.
Sixth, the application of urea as topdressing, can be applied after the rain, dry days plus water solution. Can not be deeply applied, otherwise it will make the root of grapefruit ulceration, causing death.
VII. Each year in early spring and early summer, the roots of the stems and stems can be treated with the following pesticides to achieve effective measures for prevention of acute death of pomelo trees: 500 times of pesticides Fumei double, 1 to 100 times more Bordeaux mixture, It is appropriate to pour 10-12 pomelo trees per 100 kg of liquid medicine.
Eight, the results for many years, fertilizer and water weak and weak trees, ringing time may be appropriate to postpone the winter solstice - Osamu. The girdling method can be carried out in branches, leaving a sprig without girdling. The girdling area of ​​saplings is properly increased and cannot be carried out in close proximity to the marriage to achieve the effect of preventing acute death.
Nine, less paclobutrazol inhibits plant growth and prevents tree vigor and death.
Pomelo root rot disease mainly occurs in the summer and autumn rainy season. The onset occurred mainly in the cortex and pomelo roots in the main circumcision site, and the epidermis was black at the site of the disease and smelled bad. Pomelo rot roots were examined under a microscope: Pathogens were "scytheid, filamentous mycelium fungi, and spores." Soil pH values ​​were determined to be 5-6 strong, resulting in strong soil acidity. The sick and dead fruit trees have become fine and rainy, their branches and leaves have died, and they cannot survive, digging and replanting.
Cause of the disease: After investigation, a soil type virus field, 35 cm deep soil acid back. Second, well-drained and low-lying drainage The incidence of orchards is high. 3. Spray paclobutrazol over the grapefruit orchard, and then use the girdling method to inhibit the normal growth of the plants. The chlorophyll production from the leaves cannot be smoothly transferred to the roots. Fourth, improper use of chemical fertilizers, urea, etc. caused by rot and root death. V. Early results The girdling of the young tree was too low to the grafting place, causing the sapling to die. Sixth, there is no decomposed organic fertilizer can also cause death or debilitating tree vigor. In seven, circumcision wounds large hanging fruit for many years early grapefruit girdling, the winter temperature is fickle, can not resist the cold and cold, pericyclic wounds in the spring shoot grapefruit spit can not heal the fruit tree mortality is higher.
Main technical measures and prevention methods of healthy plants:
First, the winter cultivating weeds, whitening and sterilizing, the pomelo tree does not plunge deeper in the fruiting period, and the roots can only be ploughed and weeded in the periphery of the canopy to maintain the pomelo tree's robust growth.
Second, each strain grapefruit lime 0.5-1 Jin is appropriate, not excessive, otherwise it will cause boron deficiency.
Third, the use of calcium, magnesium phosphate fertilizer per plant 5-6 kg, conditions can increase the use of plant ash and other transformation of acidity.
4. After discovering dead fruit trees, exhumation and replanting, and excavating diseased plants and nearby contaminated soil, Sie Lisan can be used to disinfect the roots of the seedlings in the cave or in the soil.
Five, Jianmiao prevention with the US-Fomemi 500 times Irrigation root; with enemy pine powder 800 times or 1 to 1 to 10 Bordeaux mixture, 70% thiophanate 100 times solution coating, spread the soil before the first coating The roots and rings are rotted and the decayed skin is scraped off with a knife.
Sixth, the application of urea as topdressing, can be applied after the rain, dry days plus water solution. Can not be deeply applied, otherwise it will make the root of grapefruit ulceration, causing death.
VII. Each year in early spring and early summer, the roots of the stems and stems can be treated with the following pesticides to achieve effective measures for prevention of acute death of pomelo trees: 500 times of pesticides Fumei double, 1 to 100 times more Bordeaux mixture, It is appropriate to pour 10-12 pomelo trees per 100 kg of liquid medicine.
Eight, the results for many years, fertilizer and water weak and weak trees, ringing time may be appropriate to postpone the winter solstice - Osamu. The girdling method can be carried out in branches, leaving a sprig without girdling. The girdling area of ​​saplings is properly increased and cannot be carried out in close proximity to the marriage to achieve the effect of preventing acute death.
Nine, less paclobutrazol inhibits plant growth and prevents tree vigor and death.
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