Sulfur mixture is a broad-spectrum, efficient, long-lasting, low-cost bactericidal, acaricidal and insecticide, especially when sprayed in high concentration before and after germination of fruit trees, which has a very significant effect on reducing the number of pests and diseases, reducing the annual dosage and reducing the cost.
Boiling of sulfur mixture: sulfur powder 10, quicklime 7 and water 60. First, heat the water, take a small amount of hot water to make the sulfur powder into a paste and pour it into a pot to boil, then slowly add quicklime to increase the firepower.
Stir constantly until the lime blocks are put in, then cook for 45 minutes (use high fire for the first 15 minutes, and use warm fire for the last 30 minutes) until the liquid is soy sauce-colored, and turn off the fire and cool. After cooling, the precise concentration is measured by Baume's specific gravity.
Generally, apple trees over 3 years old should be sprayed with 100 times of "Huangguanjun" solution and Bomei 3-degree sulfur mixture for garden cleaning and disinfection in the germination stage, which not only kills bacteria and insects, but also shocks the "gene alarm clock" of the fruit trees to remind them to wake up from hibernation in time, stimulate plant nerves and prevent and control all kinds of red spiders, scale insects and overwintering eggs.
Spraying biological pesticides to control aphids and leaf rollers in early April. In early April (after germination), spraying 0.3% urea solution and potassium dihydrogen phosphate solution alternately for 65,438+0 or 2 times at intervals of 7-65,438+00 days, so as to make the branches and leaves strong, promote the generation of new roots, gradually restore the tree vigor and ensure the growth.
Adding "Shujiangjun" 100 times solution when spraying foliar fertilizer or pesticide on fruit trees every day can inhibit the replication of infectious viruses, resist the infection of airborne viruses, and protect the population and quantity of beneficial animals earthworm and natural enemies of fruit tree pests. Therefore, it is very important to protect natural enemies while eliminating pests and diseases. ?
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Matters needing attention in planting apple trees:
Control pests and diseases before bagging. Although bagging can control pests and diseases, some pests and diseases have infected fruits before bagging. If there is no good prevention of pests and diseases, the consequence of bagging is that it will not directly contact pesticides, and pests and diseases will continue to harm the fruits in the bag and lose the significance of bagging.
Therefore, it is necessary to rough the old bark in early spring, and use a mixture of sulfur stone+fruit+tree protection before germination. The sensitive period of fruit infection is from flowering to bagging.
Ring rot and mold heart disease are easy to damage people's fruits in this period, but they do not occur (after August, ring rot will occur when the sugar content in fruits increases and the acidity, calcium concentration and acid content decrease). This period is also the absorption peak of elements such as calcium and boron.
It is the concurrent period of many pests, such as mealybug, aphid, red spider, liriomyza sativae and so on, and it is also the key period of fruit longitudinal growth. At this time, paying attention to spraying and fertilizing will play a great role in preventing diseases and pests, improving fruit setting rate, increasing fruit weight and preventing deficiency syndrome.
Carefully thinning flowers and fruits, thinning weak flowers, late-stubble flowers, axillary flowers and tip flowers, leaving a fruit 20-25 cm, a central fruit with a long stalk, and collecting flowers. Small fruit, flat fruit, battery-shaped fruit, fleshy stipe fruit, chaotian fruit, pest fruit and damaged fruit are rare.
Choose a suitable fruit bag, pay attention to paper quality and manufacturing technology. Bagging sequence should be top-down, from inside to outside, whole plant piece by piece, which is convenient for management. Don't tie the wire to the fruit handle when bagging. Appropriate late harvest and delayed harvest before and after beginning of winter can increase the sugar content, increase the color and make the aftertaste stronger.
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