A vegetable farmer in Qingzhou City recently reported that many of his open-field tomatoes have reached maturity, but the fruits are not showing good coloration. In addition, there are yellow and white spots appearing on the surface of the tomatoes. What could be causing this issue?
The problem seems to occur when the tomatoes are approaching full maturity. The uneven coloring and the appearance of yellow and white patches are becoming more common. This is likely due to the recent prolonged high temperatures, which have consistently exceeded 30°C.
Tomatoes typically develop their vibrant red color when the fruit matures at a temperature range of 20–28°C. At this optimal temperature, the pigments—especially lycopene—develop quickly and evenly, resulting in uniform coloration. However, when the temperature remains above 30°C for an extended period, the production and distribution of lycopene become disrupted. This leads to slower and uneven coloring, with yellow and white spots often appearing on the fruit's surface.
To address this issue, the farmer can take a few preventive measures. First, try to lower the temperature around the plants by using shade nets or increasing ventilation if possible. Second, consider applying a tomato growth regulator, such as a tomato erythropoietin, which can help improve fruit coloring and overall quality. It’s also important to ensure proper watering and nutrient management, as stress from heat and drought can further exacerbate the problem.
By taking these steps, the farmer may be able to improve the color and appearance of the tomatoes, even under challenging weather conditions.
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