Root Causes of Cucumber and Its Control Measures
Rotten root is the most common problem in the production of cucumbers in greenhouses. In recent years, it has been increasing year by year in some areas, which has seriously affected the cucumber yield and the economic efficiency of vegetable farmers. Therefore, it is necessary to find out the causes of cucumber root rot and take corresponding measures for effective prevention. of. Cucumber rot can be divided into physiological rot and pathological rot.
First, physiological rot
(a) roots
1. Causes Roots of cucumber are mainly due to high soil moisture, low ground temperature, and lack of light. Cucumber roots are poorly developed under conditions of low temperature, excessive humidity, and lack of oxygen, and the respiration and absorption capacity of the roots are reduced, resulting in no new roots of the plants. The roots of the original root system are brown and rot, resulting in yellowing and wilting of the above-ground leaves, in severe cases. Can cause the death of the plant.
2. Control measures. When watering, it is necessary to water according to the needs of cucumber growth, so that the small water pouring, to prevent one-time watering is too large. After watering, we can carry out rowing and loosening to increase the permeability of the soil and promote the growth of cucumber roots. For plants that produce roots, we can use rooting agent to irrigate the roots, promote new roots, and use 30% of Hymex Agent. 1000 times liquid to root, to prevent root rot infection, but also to promote the role of rooting seedlings.
(b) Burning roots
1. Causes The application of unrefined organic fertilizer, or excessive one-time fertilization, uneven fertilization, too close to the root system of the fertilizer, insufficient supply of water after fertilization, etc., will lead to excessive concentration of the soil solution, causing backflow of the root system, loss of water in the root system, resulting in root development. Bad, less lateral roots, yellowish roots and rot. The shoots of the aboveground plants were dehydrated and the leaves were yellowed. The light plants were still able to recover. The plants and leaves of the plants were yellowed and finally died.
2. Control measures. When fertilizing, one-time fertilization should not be too much and the fertilization should be uniform; when organic fertilizer is applied, organic fertilization must be fully decomposed. Once the phenomenon of burning roots can reduce the concentration of soil solution through reasonable watering to mitigate the hazards; it can also be applied through foliar spray fertilizer to supplement leaf nutrients and alleviate the deficiency symptoms caused by the loss of absorption capacity of root injuries.
Second, pathological rot
The pathological rot of cucumber was mainly root rot caused by Fusarium oxysporum and Pyricularia oryzae root rot. High temperature and high humidity, continuous cropping, low-lying land, and soil-viscosity are beneficial to disease development.
(A) symptoms
1. Cucumber Fusarium root rot. The disease mainly harms the roots and rhizomes of non-grafted cucumbers. At the early stage of disease, the base of the roots and stems was immersed in water, causing the roots to rot and dry brown. The epidermis of the stem becomes light brown and rotten, and the vascular bundles at the rotten place become brown and do not develop upward. The lower leaf color of the diseased plant became pale, and the sunny day was noon, and it recovered sooner or later. When it was severe, it could not recover. The diseased department became bad, resulting in pink moldy material, leaving only filamentous vascular bundles and dead.
2. Phytophthora root rot. The disease is mainly harmful to the roots and rhizomes of grafted cucumbers. After the results of cucumbers, they are gradually affected, causing browning and rot of the roots and stem bases. The diseased leaves appear wilting during the day and can recover at night or on cloudy days. After a few days, the lower leaves begin to yellow, and gradually develop upwards, resulting in poor development of melon strips.
(II) Control measures
1. Agricultural control. With cruciferous, Liliaceae crops for more than 3 years of rotation. The use of sorghum cultivation, timely watering, water pouring, to prevent flooding irrigation. Pay attention to the humidity after watering, and loosen the soil in time to enhance the permeability of the soil. Disinfect with 20 minutes of soaking in warm water at 50°C. The disease-free soil was used as a seedbed or a 200-400 times solution of 50% dexamethasone to water the seedbed soil.
2. Drug control. At the beginning of the disease, 65% dexamethasone 500-600 times solution and 70% thiophanate-methyl WP 800-1000 times solution can be used to irrigate the roots. 0.25 liters of each solution is irrigated once every 7 days. Can also be used 75% chlorothalonil WP 600 times or 50% carbendazim WP 500 times sprayed plant stem base and soil surface, spray every 5 to 7 days, and even spray 2 or 3 times. Can also be formulated as medicine soil sprinkled in the stem base.
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