At present, the strawberry production enters the growth period and is in the initial stages of various types of pests. With the advent of strawberry ripening, the occurrence will be even more pronounced. In recent years, the strawberry planting area gradually expanded, the multiple cropping index was high, and continuous cropping obstacles were obvious. Strawberry anthracnose and root rot were the two most common soil-borne diseases.
First, the main symptoms 1. Strawberry anthrax Anthracnose mainly damage leaves, petioles, stipules, stolons and other parts. The stolons were heavier than the leaves, followed by the leaves. The lesions on the stolons and petioles were initially spindle-shaped and depressed, and when expanded into dark brown rings, more than the lesions wilted and died. In addition to causing local lesions, the disease can easily lead to wilting and death of whole plant strains in strawberry. The initial 1 to 2 unfolded leaves lose their ability to hang down, and they return to normal in the evening or on cloudy days. As the disease progresses, the whole plant withers. Observation of the cross-section of the rhizome showed local browning from the outside to the inside.
2. Strawberry root rot disease root disease of strawberry appears reddish-brown, Raspberry farmer's image is called "red column" root rot. Root sensation starts from newborn and lateral roots, and the roots gradually appear dark brown or black. With the development of the disease, the root system rapidly necrosed and the leaves yellowed and died.
Second, the incidence of the law 1. Strawberry anthrax Anthracnose caused by fungi. The optimum temperature for pathogenic bacteria infection is 28°C~32°C, and the relative humidity is above 90%. It is a typical high temperature and high humidity type pathogen. When the temperature rises above 25°C, the young tissue of the strawberry stem or near the ground is susceptible to bacterial infection. After 2~5 days of continuous rain or showers, the strawberries are often used for continuous cropping, old stubble leaves, excessive nitrogen fertilizer, young plants, and air and light transmission. Poor incidence of seedlings can cause devastating losses in a short period of time.
2. Strawberry root rot disease Strawberry root rot is also a fungal disease. Pathogens can generally survive in the soil and use soil and seeds as the source of infection, spreading by irrigation water or rainwater. Soil temperature is low, and when the humidity is high, the disease is easy to occur. The ground temperature of 10°C is suitable for the disease, and the low temperature is higher than 25°C. The soil root rot in the sticky soil with poor water and permeability is severe.
Third, prevention and control technology points 1. Strawberry anthracnose agricultural control: when the weather is fine during the day, we must increase ventilation, reduce greenhouse temperature and humidity; timely removal of diseased leaves, diseased stems, dead leaves, old leaves and diseased plants And destroy it. Chemical control: In case of onset of small area, spraying protection should be promptly applied. 50% Prochloraz 1500 times solution or 10% Difenoconazole 1000-1500 times solution, bromocretonitrile (CPC carbon interest rate) WP 1500 times Liquid, 80% mancozeb 800 to 1000 times, 70% thiophanate-methyl 800 to 1000 times, 25% azoxystrobin 1000 to 1500 times, interval 7 days, a total of 2 to 3 times. Should pay attention to alternating medication, delaying the emergence of drug resistance, spray liquid should be uniform, can improve the control effect, immediately after continuous rainfall and turning eyes should be prevented.
2. Strawberry root rot in agricultural control: Apply enough organic fertilizer to maturity; cultivator to avoid root injury, reasonable irrigation and fertilization. Chemical control: Pythium oligo-sppium 2000~3000 times or 50% carbendazim WP 500 times, 98% ff霉 WP 2000 times, 70% thiophanate WP 600 times Liquid irrigation roots, irrigation 250 ml per plant, once every 7 days, continuous irrigation root 2 or 3 times.
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