First, yellow leaves
1, symptoms. The young leaves are bright yellowish white with green leaves on the tips of the leaves and rust-colored streak spots appear on the lower middle leaves.
2, the cause of the disease. Fertilizer, high humidity, soil acidity; excessive manganese, inhibit ferritin absorption, resulting in new leaf yellowing.
3, control measures. After onset, the leaves were sprayed with 500 times ferrous sulfate (not too heavy); magnesium hydroxide and lime were applied to the field to adjust the pH of the soil; potassium was added to balance the nutrients and ferrite supply could be met or promoted.
Second, buds are not open
1, symptoms. The ovary does not inflate and the buds do not open tightly, affecting pollination and fertilization.
2, the cause of the disease. In the cold season, the field lacks water, the air is humid, the soil pH value is more than 7.5, and the soil's self-produced boron is less effective; there is excessive lime and calcium in the field, and boron is absorbed to induce plant lack of boron, which can cause buds to remain open for a long period of time.
3, control measures. Spray borax 700 times or amino acid polypeptide pollinator on leaf surface.
Third, cracking fruit
1, symptoms. The fruit is stiff but not inflated. The sponge tissue is tight, the skin is dull, and there are white stripes. After watering, it becomes cracked fruit. It grows short and has poor quality. After the eggplants are tethered, they will crack the fruit after being watered on sunny days.
2, the cause of the disease. Low-temperature, low-light, high-temperature and high-light periods coincide with fruit enlargement, and the absorption of nitrogen, potassium and boron increases, and the relative requirement of phosphorus is less. If the input amount of phosphorus is too large, it will inevitably affect the absorption of potassium and boron, so that the fruit seed more meat and less rigid.
3, control measures. Phosphate fertilizer is mainly applied under the seedling roots during planting, and pure phosphorus is applied at 2 to 3 kg per mu in the later stage; potassium fertilizer is mainly applied during the result period.
Four, fallen fruit
1, symptoms. In the low-temperature period, the lower leaves yellowed off and the young fruit in the high-humidity period softened and fell.
2, the cause of the disease. When the temperature is too low, nitrogen and phosphorus fertilizers are applied excessively to make the soil concentration large, and the plants will be aged due to long-term nutrient imbalance, which is the sequelae of the reduction of gibberellin production caused by zinc deficiency. The petiole and culm, stalk, and fruit junctions were separated and fell off due to lack of auxin.
3, control measures. Aged eucalyptus leaf surface sprayed with zinc sulfate 700 times, or 1 kg per gram of zinc sulfate applied, can also be sprayed on the surface of the green waves and other zinc-containing nutrients to prevent long-term growth.
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