main reason:
1. An adverse environmental condition during flowering. Flower bud differentiation and flowering temperature is too high, too low drought, high humidity, anthers can not crack pollen, affect normal pollination and fertilization, causing flowering and falling down.
2. Deterioration of plant growth and development. Malnutrition or surplus leads to imbalance of vegetative growth and reproductive growth, making fruit pods insufficiently nutritious, resulting in falling flowers. In the flowering stage, watering is too early, partial nitrogen fertilizer is applied, improper support, lack of light, luxuriant foliage, impede reproductive growth; lack of fertilizer, water, rain, pests and pests and harvesting is not timely. Affect the deterioration of plant nutrition, flower buds are not fully developed and fall, the young larvae unable to stretch and fall off.
Precaution
1. Select the appropriate time. The growth period is arranged in a season where the temperature is appropriate to avoid or reduce the hazards of high and low temperatures.
2. Balance nutrition. Apply complete fertilizer and reapply basal fertilizer; timely harvest, improve plant nutrition, meet the needs of the growth of stems and leaves and fruit pods.
3. Strengthen field management. Reasonable dense planting, improved light conditions, increased photosynthetic efficiency, flowering use of 5 ~ 25 mg / kg α-naphthylacetic acid, 2 ml / kg Phosphochlorophenol acetic acid spray, all have the effect of preventing flower falling and falling.
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