Recently, the master of the vegetable farmer Sun reflects that the cucumber target spot disease in his shed is serious, and it is not effective to spray a lot of drugs. After seeing the shed, I learned that Master Sun planted four greenhouse cucumbers, the degree of which was light and heavy, but not only the target spot disease, but also the anthrax mixed. Xiao Bian learned that the recent occurrence of target spot disease and anthrax disease is more, reminding vegetable farmers to prevent it.
Same as "yellow point"
In order to prevent and treat diseases, we must first distinguish the symptoms of the two diseases.
When anthracnose is harmful to the adult stage cucumber, it is obvious in the leaves. The middle and lower leaves have circular lesions of different sizes, which gradually enlarge to form a round reddish-brown lesion with a yellow halo at the edge of the lesion. In severe cases, the lesions are densely covered throughout the leaves, and the leaves lose their ability to grow, causing the leaves to appear "fire-like" dry leaves, and the lesions are easily broken, which seriously affects the overall growth of the plants, leading to plant weakness, which is commonly known as the cucumber "yellow point" a kind of disease.
Target spot disease is one of the most prevalent diseases in recent years. The field mainly harms the middle and lower leaves, and the round spots with light brown color in the initial stage turn reddish brown, and the light is observed in the middle. The edge of the lesion is inconspicuous. In severe cases, the fusion of leaf lesions leads to the death of the leaves, which seriously affects the growth of the plants. When the humidity is high, there may be sparse gray black mold on the lesion, which is ring-shaped. Under high temperature and high humidity conditions, it is easy to produce large lesions, and when it is dry, it will produce small lesions. The disease is mildly harmful before and after flowering, and the number of melons is too much. When the plants are weak, they will appear faster and infect.
Improve the rational use of leaf resistance
The production of vegetable farmers should strengthen management, enhance plant growth, often foliar application of chitin, amino acid foliar fertilizer, enhance leaf disease resistance. Pay attention to the reasonable melon during the melon period, pick up the melon in time, reduce the burden on the plant, and ensure the plant growth balance. Cucumber is a vegetable that requires a large amount of water, so the number of times of watering is relatively diligent. The greenhouse should be properly controlled for the diseased shed, so that the sudden increase of humidity in the shed will cause rapid expansion of the disease, so water should be used when water is needed. Mainly. At present, the outside temperature is not too low. During the daytime, attention should be paid to increasing the ventilation of the shed. The rice husks, the smashed straws, etc. can be laid in the operation line to absorb the moisture in the shed.
The most effective control method for these two diseases is the agent, and the target can be used for the prevention and treatment of target spot disease. For the prevention and treatment of anthrax, drugs such as methyl thiophanate can be used, and attention should be paid to the rotation.
Urinalysis test strips refer to test strips that test for bilirubin, urobilinogen, ketone bodies, ascorbic acid, glucose, protein (albumin), blood cells, PH, etc. in urine.
Detection principle
1. pH: The pH value in the range of 5-9 is measured by the pH indicator, and the pH value of the fresh urine of a normal person is between 5-7.
2. Nitrite: The reaction is based on the reduction of nitrate to nitrite by Gram-positive bacteria in the urine. The nitrite reacts with p-aminobenzenesulfonic acid to form diazonium compounds, which are then combined with N-(1-naphthalene) )-3 aminopropanesulfonate combined with a pink color.
3. Glucose: According to the reaction principle of glucose oxidase, glucose oxidase specifically oxidizes glucose to generate glucuronic acid and hydrogen peroxide. Under the action of hydrogen peroxide, hydrogen peroxide oxidizes the indicator and turns color. .
Classification
Urinalysis test strips are divided into visual series and machine series. The visual inspection series is divided into several models according to different inspection items; the machine inspection series is divided into several models according to different applicable instruments.
1. Classification by measurement method
1) Visual inspection series
When observing the result, compare the color with the standard color code within the time specified on the color code, judge and read the result.
2) Machine test series.
For instrument operation, refer to the instruction manual of the Urine Analyzer used.
2. According to the number of measurement items
There are single-item, 2-item, 4-item and multiple test strips. Currently, 10-item or 11-item multiple test strips are most commonly used in hospitals.
3. Classification by structure
Urinalysis test strips with single-layer membrane structure and multi-layer membrane structure.
Urine Reagent Strips,Urine Test Strip,Urine Sugar Strip Test,Visual Urine Analysis Strips
Jilin Sinoscience Technology Co. LTD , https://www.jlgkscience.com