The Causes of the Necrosis of Pumpkin Rootstock Grafted with Cucumber At present, it is the time for planting cucumbers that are overwintering. Farmers often report that pumpkin rootstocks show necrosis, leading to dead trees. In order to avoid the replantation phenomenon of cucumber, most cucumber seedlings are grafted with pumpkins. It is logical that there should be no necrosis of the pumpkin rootstocks, resulting in a large area of ​​dead trees. What are the reasons for this? The analysis is summarized below. First, the symptoms Occurred mainly in the grafted cucumber seedlings that had just been planted, yellow rot and soft rot appeared on the stalks of the pumpkin rootstock, and the seedlings appeared inverted, and the roots gradually turned brown and rotted, and finally appeared dead trees. Second, the cause analysis 1, poor graft healing. If the healing is poor in the seedbed, the plant will not appear dead, because the temperature and humidity on the seedbed are very suitable for the growth of the seedlings; furthermore, the seedlings at this stage do not need a lot of nutrients and moisture, and pumpkin rootstocks do not have a large absorption pressure. However, when the seedlings were planted in greenhouses, there was a big change in the environment, and the cucumbers began to grow in large numbers, which led to the emergence of wilting in grafted and poorly-emerged seedlings, and the yellowing and rot of the pumpkin rootstock stalks. 2, medicine and fertilizer damage. Experts in the vegetable medicine network found that it mainly includes two aspects. First, the drug seedlings. In order to prevent soil-borne diseases and promote root growth, many vegetable farmers use herbs to pick up roots 1 to 2 days before planting cucumber seedlings. If the ratio of pesticides is too heavy or roots are too long, squash rootstocks will be damaged and colonized. After the emergence of stem and root necrosis. Second, there are side effects of agrochemicals and fertilizers applied at acupuncture points or in furrows, which are commonly referred to as medicines and fertilizers. 3, pumpkin rootstock varieties have poor resistance. In order to pursue profits, poor seedling manufacturers do not undergo strict control and screening when selecting pumpkin rootstock varieties. The use of pumpkin rootstocks with poor resistance to soil-borne diseases results in soil-borne pathogens infecting pumpkin stems and roots. 4, premature planting seedlings. If the grafted cucumber seedlings are not fully cured, the soil-borne pathogen infects the pumpkin rootstock through the wound, resulting in necrosis of the pumpkin rootstock. Third, control methods The above list of conditions is the main cause of the current necrosis of pumpkin rootstocks. The vegetable farmers can use the above list to find out why the pumpkin has died. But to remind vegetable farmers about a week after the colonization of cucumber, fungicides and rooting agents should be mixed to root, control the occurrence of soil-borne diseases, and promote the rapid growth of plants and slow seedlings, for example, can use hymexazol + Prok + chitin , Or a lot of water agent + chlorine bromide isocyanuric acid + chitin irrigation roots. Picc Line Cover,Picc Line Sleeve,Picc Line Shower Cover,Picc Line Waterproof Cover Wenzhou Celecare Medical Instruments Co.,Ltd , https://www.wzcelecare.com
Causes of Necrosis of Pumpkin Rootstock Grafted with Cucumber