Strawberry seedlings often die in the production process due to improper management or the influence of external environment, and often die in the production due to soil-borne diseases such as root rot, Fusarium wilt, verticillium wilt and bacterial wilt. Common reasons are analyzed as follows:

I. Soil issues

1. There are a lot of pathogenic bacteria in the soil. Most of the dead strawberry trees are attacked by soil-borne diseases, and the root of soil-borne diseases is in the soil. Due to years of continuous cropping and continuous cropping obstacles, more and more toxins are accumulated in the soil, which makes it easier for pathogens to infect the roots or vascular bundles of strawberries. In addition, the environment is suitable and pathogens multiply. Traditionally, it is not suitable for root growth to treat soil with a large amount of drugs or quicklime and kill beneficial microorganisms at the same time.

2. Soil hardening, large application of nitrogen, phosphorus and potassium fertilizer, insufficient medium and trace elements, and low content of organic matter in the surface layer of soil, which affects the activities of microorganisms and destroys the soil structure, thus affecting the formation of soil aggregate structure, leading to the reduction of soil water and fertilizer retention capacity and permeability, resulting in soil hardening. In this state, the vitality of the roots of plants will decrease due to lack of oxygen, and the roots are not easy to tie up. There are some elements in the soil, but due to the problems of soil hardening and inappropriate soil pH, the interaction mechanism of various nutrient ions in the soil and the physiological functions such as material absorption and transportation are out of balance, resulting in the symptoms of element deficiency. In order to pursue high yield and save labor, a large number of pesticides and herbicides are sprayed to kill a large number of beneficial bacteria in the soil, which leads to the imbalance of acid-base balance in the soil and the breeding of harmful bacteria in the soil.

3. The soil temperature is low and the humidity is high. When the ground temperature is 10℃, diseases such as root rot are easy to occur, resulting in trees dying. Company technical guidance 15064607273 Li Jinyu WeChat with the same number.

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Second, the external environment

1, the planting environment is not suitable, it is located in low-lying land, and the drainage is not smooth after rain, which leads to root rot, wounds and rampant bacterial infection.

2, insufficient light, low temperature and high humidity, especially continuous rainy weather, will accelerate the reproduction of germs.

Third, human operation.

1, disinfection before planting is not done well, and there are a lot of germs in diseased plants, seeds and soil; In the process of management, diseased leaves, residual leaves and old leaves were not removed in time, and the score was poor.

2, there is a wound, the application of immature organic fertilizer, the root injury; Agricultural operations are not in place, such as root injury caused by water, root injury caused by furrowing and insect pests.

3. Delayed management of seedling stage is not in place. After slow seedling, slow seedling and promote water should be watered once. At this time, Qingkulike, Wofengshu and Diliwang can be taken with water, which can play a role in nourishing roots, repairing wounds, restoring nutrition and sterilizing.

The premise of preventing dead trees is that the roots grow healthily. Therefore, after transplanting, Chinese herbal medicine can be used to irrigate or spray roots, so as to adjust soil structure, increase soil fertility and water retention capacity, improve continuous cropping obstacles, enable beneficial bacteria to successfully occupy space, avoid harmful bacteria infection, supplement nutrition, sterilize, repair wounds and promote the benign circulation of roots. Reduce the occurrence of soil-borne diseases such as root rot in strawberry planting areas for many years, improve soil acidification, salinization and hardening, and reduce the death of strawberry trees.

The specific prevention methods are as follows:

Agricultural control measures:

Choose a flat place to plant; Thoroughly remove the disease and disability of the previous crops in the field before planting; High temperature stuffy shed; Reduce the use of nitrogen fertilizer and phosphorus fertilizer, increase the application of medium and trace elements, apply fully decomposed organic fertilizer, dig deep into the soil and increase air permeability; High ridge cultivation, plastic film mulching, reducing humidity and improving ground temperature; Drainage in time after rain, watering under the film, less water, drip irrigation is the best way if conditions permit.

Chemical control measures:

The following drugs can be used to control strawberry death caused by root rot, Fusarium wilt, Verticillium wilt and bacterial wilt.

Prevention programmes:

1, before planting: dilute with 150 times solution and dip the roots.

2. Slow seedling stage: root irrigation with chlorothalonil 150-300 times+Diliwang 300-500 times+Wofengsu 600 times/kloc-0 times.

3. Seedling stage: root irrigation or spraying with chlorothalonil 150-300 times+Diliwang 300-500 times+warfarin 600 times or 1-2 times.

4. Fruit setting stage: spray with Ralstonia solanacearum 150-300 times+600 times of warfarin+siloxane for 2-4 times, with an interval of 7- 14 days, and compound garlic oil 1000- 1500 times or other chemicals at the high incidence stage.

Control scheme:

Root irrigation (150 times of chlorothalonil+1000 times of garlic oil+silicone) and spraying (2-3 times) at the same time. When the condition is serious, other chemicals can be compounded at the same time; Focus on spraying stem base.

Remarks: Dead trees are found in the new shed area, and the main reason is to irrigate 4-6 rows of diseased trees and adjacent diseased trees. Because of the serious continuous cropping and many pathogens in the old shed area, it is recommended to irrigate the roots twice.

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