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1. Dip the flowers in a timely manner, the flowers opened on the same day are easy to form a stiff fruit, and the fruit is easy to crack. In the early stage, the temperature is low, the number of flowers is small, and it is once every 2 to 3 days; the flowering period is best every day or every other day. 2. Prevent repeated staining, so as not to cause excessive concentration, cracked fruit or deformed fruit. 3. The temperature after colonization is 15-20 °C, and the concentration of 2,4-D is preferably 10-15 ppm. That is, take 1 ml of 1.5% 2,4-D, add 1 liter of water to make 15 ppm, and add 1.5 liters of water to make 10 ppm. After the temperature rises, the concentration can be reduced to 6-8 ppm depending on the weather conditions and different tomato varieties. When using 2,4-D, prevent direct application to the twigs or young leaves. Spraying is strictly prohibited. If the number of flowers in the field is large, you can use the anti-falling 25-40ppm spray.
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