1. The main symptoms of bean rust are mainly leaf infestation, and in severe cases it also damages petioles and pods. In the early stages of the disease, there were spots of chlorotic yellow and white spots below the leaves. The spots gradually increased until the entire leaf was covered. On the corresponding back surface of the lesion, yellow-brown slightly protruding spots were generated. After the epidermis ruptured, red-brown powder was scattered. Leaves yellow and fall off, the plants are short, the pods are small and small, the growth period is shortened, and finally it is dead and dead. The whole growing period of beans can be infected with pathogenic bacteria. During the period between the beginning of flowering and fruiting, the resistance is weakened and the susceptibility is enhanced.
Second, control methods
1. Clean the pastoral. After harvesting the spring bean plantings, field residues should be removed and burned in order to reduce the source of infection.
2. Select resistant varieties such as Suifeng No.8 and Zaofeng No.3.
3. Choose to do it. It is best to choose the former crop as a plot for planting grasses, and not to choose the former crop as a field for planting legumes or peanuts, so as to avoid direct invasion of rust. For planting, planting should be carried out in double lines or in single lines, so that it is easy to remove water and dredge ventilation.
4. Reasonable fertilization. Applying basal fertilization, applying topdressing as early as possible, and increasing phosphorus and potassium fertilizers, enhance root nodule activity, thicken plant growth, thick green leaves, and enhance disease resistance.
5. Chemical control. In the early stage of the disease, spraying and controlling in time, the agent can be used 15% triadimefon WP 1000 to 1500 times, or 50% rustin EC 800 times, or 50% sulfur suspension 200 times, or 30% solids Lithosulfide mixture 150 times, or 25% enemy de-emulsified oil 3000 times, 40% rivastophenone WP 4000 times, or 25% enemy de-emulsified oil 4000 times plus 15% triadimefon WP 2000 Double liquid spray. Spray once every 10~15 days, spray 2~3 times continuously.
2004-2021 New Laser Distance Sensor
Are you looking for a distance photoelectric sensor with mm high accuracy? Yes, JRT manufactured the industrial laser lidar sensor since 2004. There are different models of high accuracy sensor, high frequency distance sensors, ip54 ip65 ip67 waterproof rating etc., you can choose. The laser measuring modules, some good for outdoor using, some can be connected to your Arduino,
Also, Analog Output, RS485, USB cable is optional. If you have any other requirements of our accuracy distance sensor, please fell free to contact us
Chengdu JRT Main Ranging Modules: Industrial Laser Distance Sensors, Laser Rangefinder Sensor , Tof LiDAR Sensors.
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Chengdu JRT Meter Technology Co., Ltd , https://www.accuracysensor.com