First, the main characteristics of bud disease
1. The symptoms and pathogenicity of buds
Symptoms not only occur on the shoots and buds, but also on the bases of the stipules and petioles. Symptoms in the base of the stipes appear dark brown, brittle, and brittle. Eventually the entire plant appears tumbling or brown and dead. The entire ground may be completely Dry.
There is also a layer of mycelium on the surface of the diseased part, showing a spider web. Buds will be reflected in all parts of the environment, environmental factors are mainly air and high humidity sealed environment, is a pathological disease, will lead to plant death.
Bud blight is a fungal disease, bacteria like high temperature and humidity environment, the appropriate temperature for the disease is 22 ~ 25 °C, the cultivation density is too large, continuous rainy weather, high temperature is easy to disease, planting density, multiple fertilizers and high humidity prone to bud Withered.
2. Bud Blight Control
According to the cause of morbidity, it is divided into two types: agricultural prevention and control and chemical prevention and control.
(1) Agricultural prevention and control
Soil disinfection prior to nursery can reduce the risk of disease, such as chloropicrin and lime.
The selection of disease-free virus-free seedlings will increase the prevention and control of disease-free seedlings in the future, reduce disease and reduce costs.
The pathogen of bud blight is soil pathogenic bacteria. Crop rotation reduces the existing diseases in the soil and reduces the incidence of disease.
Proper close planting, enhanced ventilation and light transmission, avoiding high-temperature and high-humidity environments are not conducive to the survival of pathogens.
(2) Pharmacy prevention and control are divided into two categories: broad-spectrum sterilization and special effects.
Metalaxyl WP can be sprayed from 500 to 700 times, the effective period is 10 to 14 days, and the soil validity period can exceed 2 months;
Chlorothalonil is also a broad-spectrum fungicide, characterized by not entering the plant body, but only on the surface, not easy to produce drug resistance, long-lasting, sprayed with 75% wettable powder;
Jinggangmycin is an antibiotic and is used 1,000 times for 5% Jinggangmycin.
Second, the main features of calcium deficiency
1. Calcium deficiency symptoms
It is mainly reflected in leaf shrinkage but not limited to inflorescences and young shoots. For plants, calcium deficiency only occurs at specific sites (plant growth points are generally at the top of the meristem) and does not lead to plant death. It is mainly affected by soil pH, other elements of the soil, and soil moisture. This is physiological. Sexual diseases.
Calcium deficiency generally occurs when nitrogen fertilizers and potassium fertilizers excessively prevent the absorption of calcium, or the soil is dry, impeding the absorption of calcium by roots. It has little relationship with temperature and season, but it mostly occurs at budding stage. It may be due to the large amount of calcium in the flower and fruit stage.
2 calcium method
Calcium foliar spray effect is better, it is recommended that foliar spray sugar calcium, calcium amino acids, chelated calcium, calcium and boron, calcium supplement is also important in prevention, calcium deficiency symptoms generally indicate that calcium deficiency is more serious;
Application of humic acid, amino acids, and seaweed fertilizers promote root absorption of nutrients and indirectly promote calcium absorption.
More watering promotes the movement of calcium in the soil and allows the plant to absorb it.
When applying calcium, do not apply many antagonistic elements such as potassium fertilizer and nitrogen fertilizer at the same time.
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