What medicine is good for strawberry powdery mildew?
1. Powdery mildew has a higher incidence of invasion on the back of the leaf.
Powdery mildew bacteria are highly parasitic and can also penetrate the epidermis of strawberry plants without wounds through leaf stomata or directly. The number of stomata on the back of the leaf is higher, so the chance of powdery mildew bacteria invading the back of the leaf is higher.
2. High humidity and low light environment are more likely to occur.
The suitable temperature for the infection of strawberry powdery mildew bacteria is 15-25 °C, the humidity is more than 80%, especially the branches and leaves caused by unreasonable planting density or split leaves are depressed, the light is weak, the ventilation is poor, the relative humidity of the air is large, and the leaf surface and fruit surface have water film or water droplets that are more likely to occur.
3. Partial application of nitrogen fertilizer is more likely to occur
Plants with less light, more nitrogen fertilizer and fast growth rate, the organ epidermis is thin and tender, and the incidence of powdery mildew and the degree of victimization are high.
Prevention and control measures:
1. There is a difference in the tolerance of powdery mildew between varieties, so first choose a disease-resistant product. Qianberry No. 1 has a strong ability to resist white powder.
2, poor ventilation and light transmission, high air humidity environment is easy to induce powdery mildew, so try to avoid.
3, balanced fertilization, supplement comprehensive and balanced nutrition, per acre drip irrigation or chong Shi Jiamei dividend 1 bag + Jiamei brain platinum 1 bag, or Jiamei dividend 1 bag + Jiamei Hailibao 2-3 kg, potassium supplement calcium, increase the thickness and stability of fine cell membranes, enhance the resistance to pests and diseases, fast absorption, good effect.
4. Early prevention and treatment of the disease, recommended agents: 12.5% tetrafluoroetherzole, 20% pentocrazole, 25% pyrazole. Acetylene powder sulfonate, etc.
12.5% tetrafluoroetherzole for powdery mildew prevention is better, 25% pyrazole acetothene powder sulfonate for powdery mildew treatment is better, strawberry powdery mildew is serious when the two are recommended to mix 1000 times liquid Jiamei brain platinum use, spray more than 2 times, interval 6-7 days, the control effect is better.
Triazole fungicides in the phenylmethicazole, nitrimonazole, propiconazole, etc. also have a good control effect on powdery mildew, but triazole fungicides are used in the strawberry flowering and budding stage, which is easy to inhibit strawberry growth, affect the elongation of flower branches, and affect strawberry flowering and fruit setting. It is generally not recommended to use strawberries from the bud to the full fruiting period.
Jiamei dividend rooting strong seedling transplanting slow seedlings to promote flower bud differentiation expansion of loose soil general organic type
