Before the grafting of pumpkins, cucumber wilt, verticillium wilt, etc. often occurred, and dead cucumbers were very serious. In order to solve the problem of cucumber dead trees, cucumbers in the greenhouse were grafted. The grafted rootstocks were sunspot pumpkin and white pumpkin. However, after several years of development, the problem of grafted cucumber dead trees has gradually increased, and some changes have also occurred in the types of root diseases. Cucumber Phytophthora root rot Cucumber Phenanthomyces Root rot Cucumber bacterial wilt Phytophthora root rot Phytophthora root rot is caused by oomycetes and has frequently occurred in recent years. At the time of onset, the top leaves and stems of cucumbers wilted, and the whole plant was wilted; the fine roots rotted and the rough roots browned; the roots of the diseased roots were visible, and the vascular bundles were browned upwards from the roots. At the beginning of the stem, watery spots appear after the onset of disease, and contracture occurs. 72% of frost urea manganese zinc (Kelu), 72.2% of Propocarb 600x, 58% of metalaxyl MnZn 600x, 69% of Ankang Zinc 600x Such as irrigation or full spray (including the ground), the effect is better. Bacterial diseases Bacterial diseases such as soft rot and bacterial wilt can also cause dead cucumbers. Soft rot causes soft rot symptoms and has rancid odor. Grafting cucumber bacterial wilt occurs more quickly. After the onset of the disease, cucumber plants wilted at noon and recovered in the morning and evening. After repeated days, the plants died and the leaves were dry and not easy to fall off. The appearance of rhizomes was not obvious, but the vascular bundles of the diseased stems turned brown. Cross-cut stems, roots, white pus can be found. Bacterial diseases can be treated with 47% Garrett 600 times solution, 50% diclofenac (DT) 500 times solution, 14% coloammonia copper 300 times solution and other copper preparations mixed with streptomycin, etc. with root canal control. Fusarium oxysporum root rot and Pyricularia oryzae rot The main damage site of the root rot of Fusarium solani is cucumber roots and rhizomes (stems below the surface). The diseased area was initially immersed in water and then changed from light brown to dark brown rot. The diseased part was not constricted or slightly contracted. The vascular bundles in the decayed part of the disease became brown, and the cortex was thickened, but it did not develop to the upper part and was different from the wilt disease. Phytophthora root rot easily occurs on black squash, and white squash is resistant to this disease. At the beginning of the disease, the roots of the rootstock become brown and rotten, and the main roots change from light brown to brown. In severe cases, all the roots turn light brown to brown. Then, irregular longitudinal cracks occur at the base of fine roots, resulting in grayish white black-belted hyphae in the middle of longitudinal cracks. Root bark can be seen as dense black spots. The prevention and treatment of such diseases can be used 35% Fukui (Li Bingjing) 900 times, 60% fluoromorph manganese zinc 800 times and other irrigation. Physiological diseases Physiological diseases including salt damage, water damage, and fertilizer damage can cause dead cucumbers. A long period of overcast rain will aggravate the occurrence of physiological diseases. Physiological diseases rely on peacetime prevention. When it happens, use a powerful rooting agent 1000 times with love more than 6000 times to speed up the root recovery. Special reminders of these diseases are high incidence of diseases in recent years. Once the plants show external symptoms, they are often "sick and stagnant" and it is difficult to recover. It is best to remove and clean up the plants. After onset, the focus of attention should be on plants that are close to the diseased plant but have not shown symptoms of the disease, and prevent the disease from spreading through irrigation. Chengdu JRT is a world leader in the design and manufacture of highly accurate, precise and digital and analogue laser measurement sensors, including serial laser distance transducer,usb laser distance module,distance module ttl laser sensor rs232/RS485/Bluetooth. These Laser Distance Sensor products are widely used in many smart industrial precise measurement soluitons: robot,crane,etc. This laser distance measure technology, combined with the high speed, 1mm high resolution and accurate measurement, specially the micro laser sensor(41*17*7mm),will confidently and accurately solve your precision measurement problem. Laser Distance Measurement,Laser Measurement Sensors,Laser Distance Measurement,Smart Measure Sensor Chengdu JRT Meter Technology Co., Ltd , https://www.cdtoflidarsensor.com
Correctly Recognize Several Root Diseases Caused by Cucumber Dead Trees