Citrus black rot mainly damages the fruit and can occur during the growing period and the storage period of citrus.
[Hazardous symptoms] There are two types of symptoms in the fruit. One is that the skin is injured, the bacteria are invaded by the wound, and there is a water-stained hazel-like lesion. The latter lesion expands and invades the interior. At this time, the peels subside, and the surface of the lesions grows pale white hyphae, which quickly turns into a dark green mold layer. The skin of the disease department rots, and the pulp deteriorates and tastes bitter and unbearable. The external symptoms of this type are obvious. The pathogen invades the pulp from the skin and causes the whole fruit to rot. The other type is in the young fruit period. The bacteria generally invade from the umbilicus. Latent in the fruit, the appearance of the fruit does not show symptoms, the disease spread inside the fruit damage caused by the heart, pulp rot, the final black fruit collapse ring. This type of external symptoms is not obvious, the bacteria latent in the fruit, from the inside to the outside causing the whole fruit to decay.
[Implications of the disease] The pathogens may accumulate on diseased fruits through wintering with conidia, but they may also lurk in branches, leaves, and fruits for wintering. When the temperature and humidity conditions are appropriate, they produce conidia, which spread through wind and rain. Young fruit. After the young fruit was killed, it produced conidia and caused re-infestation in the field. During the entire fruit growth period, any wound or hole on the fruit surface can invade the bacteria and cause bronchitis. Among the varieties, the incidence of oranges was light, and the incidence of heavier oranges such as Satsuma mandarin, Nanfeng mandarin oranges and Fuju oranges was heavier. Fruit storage period, if the temperature is too high, humidity is too large, easy to cause the disease.
[Control methods]
(1) Strengthen cultivation management and increase tree vigor. Reduce the incidence.
(2) During the fruit growth period, spraying in time to prevent various wounds caused by diseases and insects and reduce the incidence of fruit.
(3) In order to prevent the onset of fruit during storage, within 3 days after fruit picking, spray 100-250 mg/L 2,4-D in orange fruit, 250 mg/L in orange, and 100 mg/L in red orange. . In addition, 1000 mg/L polyoxorubicin or polymycin can also be used to soak fruit for 1 to 2 minutes.
[Hazardous symptoms] There are two types of symptoms in the fruit. One is that the skin is injured, the bacteria are invaded by the wound, and there is a water-stained hazel-like lesion. The latter lesion expands and invades the interior. At this time, the peels subside, and the surface of the lesions grows pale white hyphae, which quickly turns into a dark green mold layer. The skin of the disease department rots, and the pulp deteriorates and tastes bitter and unbearable. The external symptoms of this type are obvious. The pathogen invades the pulp from the skin and causes the whole fruit to rot. The other type is in the young fruit period. The bacteria generally invade from the umbilicus. Latent in the fruit, the appearance of the fruit does not show symptoms, the disease spread inside the fruit damage caused by the heart, pulp rot, the final black fruit collapse ring. This type of external symptoms is not obvious, the bacteria latent in the fruit, from the inside to the outside causing the whole fruit to decay.
[Implications of the disease] The pathogens may accumulate on diseased fruits through wintering with conidia, but they may also lurk in branches, leaves, and fruits for wintering. When the temperature and humidity conditions are appropriate, they produce conidia, which spread through wind and rain. Young fruit. After the young fruit was killed, it produced conidia and caused re-infestation in the field. During the entire fruit growth period, any wound or hole on the fruit surface can invade the bacteria and cause bronchitis. Among the varieties, the incidence of oranges was light, and the incidence of heavier oranges such as Satsuma mandarin, Nanfeng mandarin oranges and Fuju oranges was heavier. Fruit storage period, if the temperature is too high, humidity is too large, easy to cause the disease.
[Control methods]
(1) Strengthen cultivation management and increase tree vigor. Reduce the incidence.
(2) During the fruit growth period, spraying in time to prevent various wounds caused by diseases and insects and reduce the incidence of fruit.
(3) In order to prevent the onset of fruit during storage, within 3 days after fruit picking, spray 100-250 mg/L 2,4-D in orange fruit, 250 mg/L in orange, and 100 mg/L in red orange. . In addition, 1000 mg/L polyoxorubicin or polymycin can also be used to soak fruit for 1 to 2 minutes.
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