What does the persimmon tree fear most? A detailed guide to pesticide control methods

Many families plant some persimmon trees, after all, the nutritional value of persimmons is also relatively high. Persimmons are actually very rich in pectin, vitamin C, and carotene, and people with constipation or high blood pressure are all very suitable for eating persimmons. So what do the persimmon trees people plant fear most? What pesticide is generally best to spray on persimmon trees?

What the persimmon tree fears most

1. Old persimmon trees fear transplanting most; the root system suffers relatively major damage. Because after root cutting, the tannin cells at the wound cause oxidation and form a water-impermeable isolation layer. If they are not watered immediately after transplanting, the persimmon tree roots that have formed the isolation layer can have a buffer space, making it easier to absorb water better.

2. Persimmon trees fear waterlogging most. Newly transplanted old persimmon trees have a relatively weak root water-absorption function and a small water demand, so keeping the soil appropriately moist is enough. Watering immediately or continuously will affect soil aeration, inhibit root respiration, and be unfavorable for root development; in severe cases it can lead to root rot and death.

What pesticide to spray on persimmon trees

1. Persimmon angular leaf spot: In June to July, the pathogen spreads with the help of rainwater, and August is the peak period of the disease. In mid-June, spray once with 1 (copper sulfate):2-5 (lime):600 (water) Bordeaux mixture.

2. Persimmon circular leaf spot: The ascospores formed by the pathogenic hyphae mature in mid-June and spread by wind and rain; the disease begins in August to September. In mid-June, spray once with 1 (copper sulfate):2-5 (lime):600 (water) Bordeaux mixture to prevent infection. For circular leaf spot, angular leaf spot, anthracnose, and powdery mildew, 0.3-0.5 degree Baume lime sulfur mixture or 50% thiophanate-methyl 800-1500 times liquid spray can also be used for control.

3. Persimmon fruit borer: Adults emerge from early May to early June. The first-generation larvae cause damage from late May to early July, and the second-generation larvae begin causing damage in mid-July until harvest. In mid-to-late June and from mid-August to early September, be sure to pick all damaged fruits clean and bury them deeply. During the peak adult occurrence period, spray with 90% trichlorfon 1000 times liquid.

How to prevent and control diseases and pests on persimmon trees

The main pests of persimmon trees are scale insects, persimmon fruit borers, persimmon caterpillars, etc. The main diseases are angular leaf spot and circular leaf spot. Comprehensive control measures:

1. In early winter, thoroughly clean the orchard, remove the persimmon calyxes remaining on the trees, and sweep up fallen leaves, diseased and pest-damaged fruits, diseased and pest-damaged branches, and trunks around the persimmon trees. This can remove overwintering sites for pests and diseases such as circular leaf spot, angular leaf spot, and persimmon calyx moths, reducing damage the following year.

2. In winter, scrape off the old, rough, raised bark on the trunk and large branches and destroy it centrally. After scraping, whitewash the trunk, which can eliminate persimmon fruit borers and grass scale insects.

3. Chemical control: Before the persimmon tree buds, carefully spray the tree body once with 5 degrees Baume lime sulfur mixture. From early June to early August, alternately spray a large-amount Bordeaux mixture, mancozeb, and thiophanate-methyl for disease control, and according to the occurrence of pests, spray pesticide in time for control.

The growing environment of persimmon trees

1. Temperature: Persimmon trees like warmth and are cultivated where the annual average temperature is 10-21.5°C, but 13419°C is most suitable. In places in the south with an annual average temperature of 19-21.5°C, fruit quality is poor and sunscald is likely to occur. In places in the north with an annual average temperature of 10-13°C, freezing damage occurs in some years. During dormancy, cold resistance is relatively strong and they can withstand short-term low temperatures of -20°C. Sweet persimmons like warmth more than astringent persimmons, and their cold resistance is not as good as that of astringent persimmons.

2. Water: The persimmon root system is widely and deeply distributed, and its drought resistance is relatively strong. In places with annual shower rainfall of more than 450 mm, irrigation is generally not needed, but long-term drought can also affect root, branch, leaf, and fruit growth and worsen fruit drop. In the north, spring and autumn are dry; if watered in time, yield can be significantly increased. Continuous rainy weather in summer easily leads to disease epidemics. Persimmon rootstock roots have a small respiration rate and relatively strong tolerance to oxygen-deficient environments, and are relatively tolerant of moisture.

3. Light: Persimmon is a light-loving tree species. When light is sufficient, branches and shoots are sturdy, flower bud differentiation is abundant and good in quality, fruit set rate is high, fruit coloring is good, organic nutrients accumulate more, and sugar content is high.

4. Soil: The persimmon tree has a strong root system and a wide range for absorbing fertilizer and water, and has no strict requirements for soil. It can grow regardless of mountains, hills, riverbanks, plains, fertile or barren soil, or sandy or clay soil. However, it grows and fruits best on loam and clay loam with a soil layer depth of more than 1 m, a groundwater level below 1 m, and strong water- and fertilizer-retention capacity. It can be cultivated within a soil pH range of 5-8, with pH 6-7 being most suitable. At pH>8 and a salt content of 0.026gb or more, growth is poor.

In the article above, the editor also shared with everyone some methods related to persimmon tree cultivation. Have you all learned them? In fact, many fruits on the market now have been treated with ripening agents and pesticides, so if conditions at home allow, planting some fruit trees is also a very good thing.