First, the control object. Although the lime sulfur is widely used, it is not a “universal pesticideâ€. If no object is used on all fruit trees, some sensitive fruit trees will be phytotoxic. Citrus anthracnose, scab, resin, black spot and mite; powdery mildew of apples, chestnuts, and strawberries; pear scab, anthrax; puddles of plum, plum, apricot, plum, cherry, and bacteria Spontaneous perforation; grape black spot disease; persimmon anthracnose and anthraquinone, etc., in different periods, the use of different concentrations of lime sulfur mixture.
Second, the use of concentration when. When some farmers use lime sulfur, the concentration is about 1 degree Baume, so that some fruit trees have poor control effect, and some fruit trees even have phytotoxicity, it should be based on different fruit trees, different control objects, different climatic conditions, Reasonably determine the concentration of use. Such as the prevention and treatment of citrus anthracnose, scab, resin and acarids, spring and autumn suitable Baume 0.3 to 0.5 degrees; the summer should use Baume 0.3 degrees; the winter is appropriate to use Baume 5 degrees. To control peach and plum bacterial perforation, it is recommended to use Baume 5 degrees before sprouting, and Baume 0.3 degrees after spreading leaves. In short, in the specific use should consult the relevant information, according to the need to determine the use of concentration.
Third, when mixed. Randomly mixing lime sulfur and other pesticides results in poor results. The lime sulfur mixture is strongly alkaline. If it is mixed with acidic pesticides, acid-base neutralization reaction occurs between the two, thus reducing the efficacy. Although Bordeaux's solution is also alkaline, it cannot be used in combination with lime sulfur, because the mixture of the two will increase the amount of dissolved copper. Copper ions will interfere with the activity of the enzyme in the plant, causing phytotoxicity. Therefore, the lime sprayed the Bordeaux mixture for 15 to 20 days before it sprayed the lime sulfur mixture, and sprayed the lime sulfur spray for 7 to 10 days before spraying the Bordeaux mixture. Lime sulfur cannot be mixed with rosin mixture, cotton soap and acidic pesticides. If lime sulfur must be used in combination with acidic pesticides, only low concentrations of lime sulfur can be used, and they must be used with mixing.
Fourth, use the temperature when. Regardless of the temperature, lime sulfur is often used to cause injury. Practice has proved that the general crops should not use lime sulfur when the temperature is below 4°C in the early spring and high temperatures are above 32°C in the summer. Such as high temperature sprayed on the fruit of Satsuma Citrus can easily cause sunburn, peach, plum, pear, apple and other fruit trees sensitive to lime sulfur, mainly in winter or early spring before germination.
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