Strawberry root rot mainly damages the root system. At the beginning of the disease, it starts from the lateral roots or the newly born roots. The initial roots appear light red or brown irregular patches, and the color gradually darkens. With the development of the disease, all roots quickly became necrotic and brown; the leaves of the outer part of the ground were yellowed first, and some of the leaves became brown, necrotic, and crimped. The diseased plants showed a lack of water and gradually developed toward the heart until the whole plant died of yellow.
The occurrence of strawberry root rot is closely related to the soil environment. Generally, the occurrence of root rot of the plot within 5 years of planting strawberries is lighter or does not occur. The root rot of the strawberry grown in 5 years, especially 10 years or more, is particularly Seriously, the output also dropped. The root rot of strawberry root rot was significantly shorter than that of normal plants, and the color was dark. The adventitious roots of the roots died a lot. The growth of the roots of new plants was sparse after being attacked by pathogenic bacteria. The damage to the roots and the ability to absorb water and fertilizers will directly lead to the failure of normal transport of moisture, inorganic substances and nutrients, resulting in weaker or darker yellows.
Control methods
Rational rotation, clearing the pastoral field to remove the diseased plant and diseased residues in the field, centrally burning or sterilizing the soil during the idle period of the greenhouse, using 120 kg of lime nitrogen per acre, and continuously drenching the cover after watering More than 25 days can effectively kill soil bacteria and eggs.
High ridge mulch cultivation, scientific watering and fertilizing root rot are directly related to excessive moisture in the shed or excessive watering. In order to reduce the humidity in the greenhouse, it is advisable to adopt high ridge and film-cover cultivation to achieve watering under the membrane and pouring in a small amount of water. It is advisable to adopt the drip irrigation method for the conditions. When basal fertilizer is used for strawberries, sufficient organic fertilizer should be applied to increase the amount of bio-organic fertilizer and deep-swap the soil to improve soil permeability and buffer strength.
The prevention and treatment of strawberry root rot should be based on prevention. Spraying 75% chlorothalonil WP to 500 times to 800 times solution and Pdiddenin protein 300 times before and after flowering and flowering can also be used. After planting, rooting with 500 times solution of P. dendrite and 800 times solution of hymexazol had obvious effect on preventing root rot in early stage. For the greenhouse strawberry that has now undergone root rot disease, the diseased plant should be pulled out in time, and the roots should be rooted with 1500 times solution of a cream and hymexazol and 500 times solution of Pidgin fish protein.
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