Symptoms, causes and control measures of white gourd charcoal rot

Wax gourd is one of the vegetables we often eat. It tastes refreshing and light. It is a kind of green and healthy vegetable. In the process of wax gourd planting, it will be attacked by diseases and insect pests for various reasons, especially wax gourd charcoal rot is very common, once it occurs, the harm to the fruit of wax gourd is very great. Let's take a look at the symptoms, causes and control measures of wax gourd charcoal rot.

Symptoms of charcoal rot of wax gourd

Anthracnose and carbon rot of wax gourd are widely distributed and common, and can occur in both protected and open fields. The disease is usually sporadic and can reach more than 10% in severe cases. It mainly harms the roots and stems of wax gourd plants, but also harms the fruits, and when serious, it also harms leaves and stems. In the adult stage of wax gourd, the rhizome was damaged near the surface, the epidermis was water-routed at the initial stage, the posterior cortex was slightly cracked, the diseased part mostly formed a dark brown tumor, and there was dark brown juice outflow, and withered and died above the diseased part in the later stage. A large number of black dots, namely conidia and microsclerotia, can be produced in the rhizome of dead plants. Leaves infected with disease, mostly formed brown near-round disease spots, in the later stage of the disease spots on the production of black grain spots, resulting in leaf death. When the fruit was damaged, the water-routed near-round spot was formed at first, then softened and rotted, obviously sunken, and gradually produced charcoal black granules on the disease spot, that is, the conidium of bacteria. In the later stage, it developed into a large charcoal black disease spot, and the disease melon completely lost its edible value.

2. The cause of charcoal rot of wax gourd.

The pathogen overwintered in the soil with mycelium or sclerotia, and the conidia released from the conidia in the next spring were transmitted by wind and rain, invaded from the wound and re-infected continuously in the field. It is easy to get sick under the condition of high temperature and high humidity or the wound on the plant.

III. Control measures of charcoal rot of wax gourd

1. Disease-resistant and resistant varieties were selected. Soak the seeds with a new high-fat membrane before sowing, remove the seeds and dry them after sowing. It can keep heat, keep moisture, absorb swelling, improve seed germination rate and make seedlings strong. Repelling underground pests and isolating virus infection. It can also be mixed with seed coating agent. 2. Good control of diseases such as blight, anthrax and powdery mildew can basically cure the root cause of the disease without the need for separate control. It can be sprayed in advance with targeted fungicides combined with 500-fold solution of new high-fat membrane for control, inhibit bacterial replication, reduce drug resistance and dosage, and improve the effect of pesticides.

2. Cleaning and disinfecting the cellar before storage and paying attention to the regulation of temperature and humidity can reduce the occurrence of the disease during the storage period.

In addition, wax gourd anthracnose is also common, mainly for damage to leaves and fruits, but also to seedlings and vines. During the disease of the seedlings, the base of the stem near the ground becomes dark brown and constricted, and the seedlings die; the leaf surface is diseased, initially showing a waterlogged round light brown spot, and soon becomes black or purple-black round spot, some concentric wheel lines; stem vine disease, disease spot round or spindle type, black, slightly sunken, the disease spot around the stem vine after a week, the upper leaf vine withered When the fruit is damaged, the fruit surface is slightly raised and then browned to purple-brown round or oval disease spot, obviously sunken, many small black spots are arranged in a ring, and cracks often appear in the disease spot.