What is the reason for falling flowers and fruits of tomatoes? How to prevent and cure?

Tomato fruit is rich in nutrition, with special flavor, and can be eaten raw and cooked. At present, it is widely cultivated in our country, but in some areas, it is easy to fall flowers and fruits. So, what is the reason why tomatoes fall? How to prevent and cure?

First, what is the reason for falling flowers and fruits of tomatoes?

1. Abnormal temperature

Too high or too low temperature will lead to floral organ defects, resulting in falling flowers and fruits. Relevant data show that tomato will cause a large number of falling flowers when the night temperature is lower than 15 ℃ or higher than 22 ℃ and the daily temperature is higher than 35 ℃.

2. The plant is flourishing.

The environmental conditions of high temperature and humidity in summer are easy to cause plant growth and eventually lead to flower and fruit drop, so attention should be paid to control.

3. Boron deficiency

In some areas, boron deficiency can also cause a large number of tomato flowers and fruits, so we should pay attention to the application of sufficient boron fertilizer in the base fertilizer.

4. Improper soil and air humidity

Too much or too low moisture will cause flowers and fruits to fall. If the soil moisture is too much, it is easy to cause overgrowth, resulting in falling flowers; if the lack of water causes soil drought, it is easy to cause the formation of separated layers, resulting in a large number of falling flowers and fruits.

Second, how to prevent and control tomato falling flowers and fruits?

1. Regulation and control of temperature and light conditions

Relevant data show that a large number of tomatoes will fall when it is lower than 15 ℃ or higher than 22 ℃ at night and higher than 35 ℃ during the day. Therefore, in the tomato fruit-setting period and flowering stage, it is necessary to control the temperature within this range. In addition, the summer temperature is too high, in order to protect flowers and fruits, in order to reduce the concentration of anthers, we can choose 2mem4Murray D or Fangluo to protect flowers and fruits. The suitable concentration is 15mg / kg if using 2mae 4muryl D and 25mg/kg if anti-falling element is selected. Be careful not to apply the liquid to the heart leaves and tender stems to prevent hormone poisoning.

2. Fertilizer and water management

Fertilization: apply enough boron fertilizer in the base fertilizer and pay attention to the foliar spraying of boron-containing leaf fertilizer at flowering stage.

Watering: slow seedling stage to the first ear to sit, appropriate less watering, to prevent plant overgrowth, resulting in falling flowers and fruits. The first ear fruit expands, the second ear fruit sits, the watering times is increased, and the young fruit is watered at the right time.

3. Plant adjustment

Single stem pruning or double trunk pruning can be used. Take single dry pruning, leaving about 7 ears per plant. Three fruits can be left in the first ear, and 3-4 fruits in each ear from the second to the fifth ear, with extra fruit removed. Timely erase lateral buds and timely thinning flowers and fruits, keep the fruit large and uniform, generally leave 5-6 fruits per panicle, when the fruit grows to about 2 cm in diameter, then remove the deformed fruit, disease and insect fruit, and retain 4-5 fruits. But its first few ears of fruit must not leave too much fruit, in case nutrition concentrated supply of fruit expansion, resulting in serious fruit drop of upper tribal flowers.

4. Disease and pest control

The main diseases are early blight, gray mold, canker, streak virus, etc. It is suggested that chemical prevention should be done. Early blight and botrytis are fungal diseases, which can be prevented by chlorothalonil, methyl thiophanate or carbendazim, etc. Canker is a bacterial disease, which can be prevented by agricultural streptomycin or copper preparation (DT, Wang copper, etc.) To prevent virus disease, morpholidine copper acetate (virus A) + Ningnanmycin can be sprayed. At the same time, attention should be paid to the application of imidacloprid or acetamiprid to control the occurrence of whitefly, aphids and other pests.

Generally speaking, the main causes of tomato falling flowers and fruits are abnormal temperature, plant growth, boron deficiency, improper humidity and so on. Growers should pay attention to these aspects and take corresponding preventive measures when planting tomatoes. You can effectively control its falling flowers and fruits.