1. Spray protective fungicides before the rain to prevent the occurrence of diseases. Spray the systemic fungicide after the heavy rain. If it rains, pay attention to the spray before the rain.
2, in order to avoid phytotoxicity in the hot season, should choose high-quality, safe and efficient pesticides, and do not arbitrarily increase the drug multiples.
3, do not spray Bordeaux liquid before the rain: sprayed Bordeaux liquid before the rain, washed away the lime on the fruit surface after the rain, but left the copper ions, it will stimulate the peel layer, produce phytotoxicity, form fruit rust, affect Fruit appearance quality and product value.
4, do not spray in dry, hot weather: general pesticides suitable temperature 20-30 ° C, the highest does not exceed 32 ° C, so before 10 o'clock in the morning, after 15 o'clock spray is relatively safe, most pesticides in the weather too Drought, when the temperature is too high, the water is evaporated quickly, and the concentration of the pesticide is easily increased. In addition, the fruit tree absorbs the liquid quickly, the physiological function is strong, and the resistance is relatively reduced, so that the phytotoxicity is easy to occur.
Author: Wei Rong
Source: Gansu Science and Technology News
2, in order to avoid phytotoxicity in the hot season, should choose high-quality, safe and efficient pesticides, and do not arbitrarily increase the drug multiples.
3, do not spray Bordeaux liquid before the rain: sprayed Bordeaux liquid before the rain, washed away the lime on the fruit surface after the rain, but left the copper ions, it will stimulate the peel layer, produce phytotoxicity, form fruit rust, affect Fruit appearance quality and product value.
4, do not spray in dry, hot weather: general pesticides suitable temperature 20-30 ° C, the highest does not exceed 32 ° C, so before 10 o'clock in the morning, after 15 o'clock spray is relatively safe, most pesticides in the weather too Drought, when the temperature is too high, the water is evaporated quickly, and the concentration of the pesticide is easily increased. In addition, the fruit tree absorbs the liquid quickly, the physiological function is strong, and the resistance is relatively reduced, so that the phytotoxicity is easy to occur.
Author: Wei Rong
Source: Gansu Science and Technology News
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