First, the main features of bud blight
1. Symptoms of bud and pathogenesis
Symptoms not only occur on the dryness of the buds and flower buds, but also the dark and brown lesions in the susceptibility of the stipules and petiole bases, which are brittle and brittle. Eventually the whole plant is collapsed or brown and dead, and the entire upper part may be completely Dry.
A mycelial layer is also formed on the surface of the diseased body, which is expressed as a spider web. The bud is reflected in all parts. The environmental factors are mainly air-humidity and airtight environment, which is a pathological disease, which will lead to plant death.
Budding blight is a fungal disease. The pathogen prefers high temperature and high humidity environment. The suitable temperature for the disease is 22~25°C. The cultivation density is too large, the continuous rainy weather, the high temperature is easy to be sick, the planting density is large, the multi-fertilizer and high-humidity are easy to sprout. Withered.
2. Bacterial blight control
According to the cause of the disease, it is divided into two categories: agricultural prevention and control and chemical prevention and control.
(1) Agricultural prevention and control
Soil disinfection before seedling can reduce the incidence of disease, such as chloropicrin and lime.
The use of disease-free virus-free seedlings is produced, and the disease prevention and control will be strengthened in the future without disease, and the disease will be reduced and the cost will be reduced;
The bud blight pathogen is a soil-borne pathogen, and the rotation reduces the disease existing in the soil and reduces the incidence of the disease;
Reasonable close planting, strengthen ventilation and light transmission, avoid high temperature and high humidity environment, is not conducive to the survival of germs.
(2) Pharmacy prevention and control, divided into broad-spectrum sterilization and special effects.
The metalaxyl WP can be sprayed 500~700 times, the effective period is 10~14 days, and the soil retention period can be more than two months;
Chlorothalonil is also a broad-spectrum fungicide . It is characterized by not entering the plant body, only acting on the surface, not easy to produce drug resistance, and lasting for a long time, sprayed with 75% wettable powder;
Jinggangmycin is an antibiotic that is 1000 times more effective than 5% Jinggangmycin.
Second, the main features of calcium deficiency
1. Calcium deficiency symptoms
Mainly reflected in the shrinkage of the leaves, but not limited to inflorescences and young shoots. For plants, calcium deficiency occurs only at specific sites (plant growth points are generally at the top meristem) and does not cause plant death, mainly due to soil pH, soil Other element stress, soil moisture, which is physiological Sexual diseases.
Calcium deficiency is generally caused when nitrogen or potassium fertilizer is applied too much to hinder the absorption of calcium, or the soil is dry, hindering the absorption of calcium by roots. It has little to do with temperature, season, etc., but it occurs mostly in the bud stage, probably because the amount of calcium required in the flowering period is relatively large.
2. Calcium supplementation method
Calcium leaf surface spraying effect is better, it is recommended to spray foliar calcium, amino acid calcium, chelated calcium, calcium boron, etc. Calcium supplement is also important in prevention, generally calcium deficiency symptoms indicate that calcium deficiency is more serious;
The application of humic acid, amino acids and seaweed fertilizer promotes the absorption of nutrients by roots and indirectly promotes the absorption of calcium.
More watering promotes the movement of calcium in the soil and allows plants to absorb it.
When supplementing calcium, do not apply a lot of fertilizers such as potassium fertilizer and nitrogen fertilizer at the same time. It is recommended to apply a strong supplement effect.
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