1. Fusarium solani root rot is the main root rot species of non-grafted cucumber.
Mainly harmful roots and rhizomes. The roots are initially water-soaked, causing decay and drying to brown, but the base of the stem does not collapse. The stem was initially water-soaked, and the posterior epidermis became yellowish brown and rotted, and the vascular bundle at the decayed browning did not develop upwards. In the later stage, the water was rotted, and the remaining vascular bundles were silky. The lower leaves of the diseased plants are lighter in color, and they are wilting at noon under strong light, and recover sooner or later. When it is serious, it can not be recovered, the diseased part becomes worse, and a pink mildew is produced. Only the filamentous vascular bundle is left, and it is dead.
The difference between this disease and blight is that the browning of the vascular bundle is limited to the decayed part and no longer develops upward.
Diagnostic points: First, the base of the underground stem rots, the contracture is not obvious; the second is that the base of the stem becomes brown; the third is that the duct at the base of the stem turns brown, but does not develop upwards, that is, the duct of the upper stem does not change color.
2. Pseudomonas sp. root rot is the main root rot disease of grafted cucumber.
After the results, the disease continued to occur. The course of disease is longer, and the leaves appear to be wilting during the day, and can recover in the evening or on cloudy days. After a few days, the lower leaves begin to yellow and gradually develop upwards, resulting in poor melon development. There are two kinds of occurrences: First, the grafted seedlings belong to the black-squash squash. The stem base near the ground appears to be brown-stained and brown, causing the whole plant to die. Second, there is no water immersion and spoilage at the base of the stem, pumpkin and cucumber. The vascular bundle also did not change brown, and the roots of the roots were brown and rotted, and the main roots and branches were also light brown to brown. In severe cases, the roots all turned brown and dark brown, and all the bases of the fine roots were longitudinally split. In the middle of the longitudinal fissure, grayish black banded hyphae may be found, and dense black spots are visible in the root bark cells.
Comprehensive prevention and control points:
1, high temperature and high humidity is conducive to the onset, pay attention to moisture after watering.
2, the application of biological fertilizer, in addition to the root irrigation agent, mixed with biological fertilizer (foliar fertilizer) effect is better.
3, irrigation root agent optional: carbendazim, collateral copper water agent, Guangzengling, carbamide, carbendazim + thiram and other agents. Mixed with rooting agents, such as: rooting and seedlings, Harvest No. 1, and shellfish.
Mainly harmful roots and rhizomes. The roots are initially water-soaked, causing decay and drying to brown, but the base of the stem does not collapse. The stem was initially water-soaked, and the posterior epidermis became yellowish brown and rotted, and the vascular bundle at the decayed browning did not develop upwards. In the later stage, the water was rotted, and the remaining vascular bundles were silky. The lower leaves of the diseased plants are lighter in color, and they are wilting at noon under strong light, and recover sooner or later. When it is serious, it can not be recovered, the diseased part becomes worse, and a pink mildew is produced. Only the filamentous vascular bundle is left, and it is dead.
The difference between this disease and blight is that the browning of the vascular bundle is limited to the decayed part and no longer develops upward.
Diagnostic points: First, the base of the underground stem rots, the contracture is not obvious; the second is that the base of the stem becomes brown; the third is that the duct at the base of the stem turns brown, but does not develop upwards, that is, the duct of the upper stem does not change color.
2. Pseudomonas sp. root rot is the main root rot disease of grafted cucumber.
After the results, the disease continued to occur. The course of disease is longer, and the leaves appear to be wilting during the day, and can recover in the evening or on cloudy days. After a few days, the lower leaves begin to yellow and gradually develop upwards, resulting in poor melon development. There are two kinds of occurrences: First, the grafted seedlings belong to the black-squash squash. The stem base near the ground appears to be brown-stained and brown, causing the whole plant to die. Second, there is no water immersion and spoilage at the base of the stem, pumpkin and cucumber. The vascular bundle also did not change brown, and the roots of the roots were brown and rotted, and the main roots and branches were also light brown to brown. In severe cases, the roots all turned brown and dark brown, and all the bases of the fine roots were longitudinally split. In the middle of the longitudinal fissure, grayish black banded hyphae may be found, and dense black spots are visible in the root bark cells.
Comprehensive prevention and control points:
1, high temperature and high humidity is conducive to the onset, pay attention to moisture after watering.
2, the application of biological fertilizer, in addition to the root irrigation agent, mixed with biological fertilizer (foliar fertilizer) effect is better.
3, irrigation root agent optional: carbendazim, collateral copper water agent, Guangzengling, carbamide, carbendazim + thiram and other agents. Mixed with rooting agents, such as: rooting and seedlings, Harvest No. 1, and shellfish.
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