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Why cherry tomato white spot
In recent weeks, many cherry tomato farmers have reported the appearance of white lesions on their crops, which has significantly impacted both the growth of the plants and the marketability of the fruits. Experts have investigated the issue and suspect that the problem may be related to a physiological calcium deficiency in the tomatoes, although further confirmation is needed.
The symptoms typically appear on green or red fruits, with white spots forming symmetrically on both sides of the fruit. These spots are not deep within the fruit but only affect the outer layer, leaving the pulp unaffected. The affected areas do not develop color and remain pale or white, which can reduce the overall quality and appeal of the produce.
From an analysis of the causes, two main factors stand out. First, during the late growth stage, inconsistent or inadequate water supply can lead to stress in the plants. When the soil becomes dry, the leaves transpire heavily, drawing water away from the fruits. This competition for moisture can hinder the development of the fruit's pulp. Second, if the plants are unable to absorb sufficient calcium and boron from the soil, it can result in an internal nutrient imbalance. This disruption in nutrient uptake affects the physiological function of the fruit cells, leading to impaired water regulation and ultimately, restricted pulp growth.
To address this issue, several preventive and control measures can be taken. First, maintaining a consistent and adequate water supply is crucial, especially during the fruiting stage. Watering should be done in the early morning, between 9 and 12 o'clock, to minimize evaporation and ensure proper hydration. Second, selecting disease-resistant varieties can help reduce the risk of such problems. Third, when the sun is strongest at noon, using shade nets can protect the plants from excessive heat and light stress.
Additionally, applying organic or bio-organic fertilizers can improve soil health and nutrient availability. A balanced fertilization plan based on soil testing is also recommended. For immediate relief, foliar applications of calcium supplements can be effective. Spraying a solution of amino acid-based calcium fertilizer at a concentration of 200 to 300 times diluted, combined with other nutrients, can help restore the plant’s balance. It's important to apply these treatments regularly, ideally every 15 days, for a total of three applications. At the same time, it's advisable to spray for umbilical rot prevention to ensure comprehensive protection.