Latest Causes and Control Measures for Abnormal Growth of the Cucumber Growing Tip
The apical growing point of the cucumber is called the growing tip, and whether a cucumber plant grows robustly depends on the vigor of the growing tip. Under normal conditions, the small leaves at the top of the growing tip appear in three colors - green, yellow-green, and tender yellow - with even color and no pests or diseases. However, during cultivation, the growing tip often shows symptoms such as rotten head and yellow head. What is going on here? Let's learn about it together.
1. Phytotoxicity
Cucumbers suffer from relatively serious diseases during growth. To control diseases, many farmers tend to increase the concentration of pesticides or mix pesticides arbitrarily, which very easily causes phytotoxicity. After phytotoxicity occurs, it manifests as dry or yellowed leaf margins, deformed leaves and fruits, and the appearance of spots or lesions. Therefore, when controlling pests and diseases, the concentration and dosage must be strictly controlled. Do not overuse pesticides, and try to avoid mixing pesticides, especially mixing with copper-based preparations, so as to avoid phytotoxicity and cause abnormal growing tips.
2. Diseases
Diseases are also one of the causes of rotten heads and yellow heads in cucumbers, such as scab and gray mold. When brown spot disease is severe, it can also cause a large number of yellow spots to appear on the top leaves of cucumbers, forming yellow heads. In low-temperature winter seasons, vine blight is also prone to occur and can cause rotten heads in cucumbers. Other cucumber diseases such as bacterial marginal blight, scab, gray mold, and gray blight can all cause rotten heads in cucumbers. Therefore, when abnormal growth of the cucumber growing tip is caused by disease, first distinguish which disease is causing it, and then apply the appropriate treatment.
⟦NL>3. Nutrient deficiency
Nutrient deficiency is also one of the causes of abnormal growth of the cucumber growing tip. When the plant lacks zinc and iron, yellow heads are likely to occur. First the top leaves turn yellow, and the areas between the veins become yellow-white, then the yellow leaves spread from top to bottom, gradually causing the leaf margins to necrose and dry up. When calcium is lacking, rotten heads are likely to occur. First the top leaves begin to rot from the leaf margins or between the leaves, and finally the cucumber growing point disappears. Therefore, fertilization must be balanced. Not only should attention be paid to the balance between organic fertilizer and chemical fertilizer, but also to the balance between trace elements and secondary elements. Calcium fertilizer should also be supplemented in time to avoid rotten heads caused by nutrient deficiency.
4. Hormone poisoning
When dipping cucumbers, excessive concentration of the solution, or the solution splashing onto cucumber leaves and stems, can cause hormone poisoning in cucumbers, which can also lead to abnormal growth of the growing tip. After hormone poisoning occurs, the leaves begin to yellow, the top leaves become hard and brittle, and growth slows or even stops. Therefore, when dipping cucumbers, the solution concentration must be well controlled, and the operation must also be done carefully.
The above is an introduction to the causes and control measures of abnormal growth of the cucumber growing tip. We hope it can help you. To learn more related knowledge, please follow us.