Recently, vegetable cultivator Li Hongguo told the author that his cucumber appeared dead tree phenomenon. He took a plant and asked for a farmer's resource to ask him to criticize him. The owner of the agricultural investment shop said that it was caused by Phytophthora root rot. He recommended it to him. One kind of medicine, let him spray it several times. After he sprayed, cucumbers still have dead trees.
The author was very surprised to hear that Phytophthora root rot is a typical root disease. It depends on the foliar spray to solve the problem. Phytophthora root rot is an oomycete disease. The control agents are fungicides and the fungicides are Inhalation and protection of the points. In general, the vast majority of systemic fungicides used today are transported in the plant from bottom to top, that is, from the roots of the plants, to the top of the plants, and to the top leaves, the top buds and leaves, and the leaf margins. However, if only the leaves are sprayed, the medicament will only stay on the leaves and will not reach the roots of the plants, and will not affect the root diseases. If non-systemic bactericides are used, they will not enter the plant body and cannot be transported to the surrounding area, and they will not affect root diseases. In other words, most of the existing pharmaceuticals are difficult to transmit from the ground to the roots to prevent and treat diseases, and only where the disease occurs will be used where medicines can be used to obtain good control effects.
Therefore, if you want to prevent and control root diseases, you must rely on the method of irrigating the roots to directly apply the medicine to the affected area. Phytophthora root rot control, it is best to use 60% fluoride manganese fluoride (extinction grams) WP 700 times or 30% Hymex Agent 800 times, 3% methathone (Kang Ling) Water agent 600 times watering.
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