Recently, the greenhouse strawberry has entered the period of centralized planting. Combining with the occurrence of major diseases and insect pests in strawberries over the past years, the following prevention and control guidelines have been proposed.
Seedlings are processed in advance
About 7 days before emergence, 70% thiophanate-methyl wettable powder 1000 times, or 10% difenoconazole water dispersible granules 1500 times, 70% chlorothalonil wettable powder 600 times Liquid, 25% carbendazim wettable powder 400 times liquid spray sterilization; can be added 4.5% high efficiency cypermethrin EC 1500 times, 8% Zhongbao killing 2000 times liquid, integrated control of beet armyworm, red spider, mite and other pests .
Planting period
1. Spray pesticides to prevent strawberry red spiders. Before or after the strawberry planting, choose 8% Zhongbao killing 2000 times liquid, or 1.8% thifentanone EC plus 1.8% avermectin EC 2000 times to spray the strawberry seedlings.
2. Medicament roots, seedlings, prevent a variety of strawberry diseases. The roots of strawberry seedlings were soaked in 25% azoxystrobin suspension 1500-2000 times, or 70% chlorothalonil wettable powder 600 times, or 25% prochloraz 1500 times, and soaked for 1-3 minutes. Care should be taken to avoid soaking seedlings. Then put the roots of the strawberry seedlings on the top of the liquid and quickly dip it in the liquid and let it drain after natural colonization. Note that the formulated liquid will only be soaked once and cannot be reused to avoid cross infection.
Precautions
1. Use robust strawberry seedlings. The stem diameter is 0.6-1.2 cm, the heart is normal, and the leaves are hypertrophic. It has 4-5 normal-developed leaves. The root system is well-developed. There are more white hair roots and the height should not exceed 30 cm. Planting of strawberry seedlings infected with anthrax, root rot and blight may cause dead seedlings and is not recommended for production seedlings.
2. Sort strawberry seedlings. Prior to planting, the strawberry seedlings must be sorted and graded as necessary. The seedlings should be separated and the strong seedlings should be kept. The weak seedlings and diseased seedlings should be eliminated. 4-5 healthy leaves should be kept in each seedling, and the rest should be cut off with scissors, leaving only a section of petiole. Note that when finishing seedlings, it is not appropriate to remove excess leaves by hand. Otherwise, it is easy to cause wounds in the base stem to infect root rot and blight diseases.
3. Suitable environmental colonization. Should choose the weather with lower temperature, choose cloudy, rainy days or sunny evening colonization. Avoid direct sunlight, transpiration is too large, excessive dehydration of seedlings dehydration is not conducive to slow seedlings. When conditions are not available, shade nets can be used for colonization.
4. The appropriate depth of colonization. Depth of planting is the key to the survival of strawberry seedlings, which is based on the principle of “not burying the roots, not hiding rootsâ€. To plant a seedling too deep can easily cause rot and rotten; if it is too shallow, it is not conducive to rooting and easing seedlings.
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