Causes and Preventive measures of Yellow leaves of Tomato

In the process of tomato cultivation, yellowing of leaves is a common phenomenon, sometimes old leaves, sometimes young leaves, functional leaves and heart leaves, which has a certain impact on tomato yield. So what are the reasons for the yellow leaves of tomato? Let's get to know it with the editor.

1. The cause of fertilizer and water

In daily management, due to excessive fertilization, the root system is damaged, unable to absorb enough nutrients and water to supply plant growth, so leaves yellowing, improper watering, excessive watering in the field, retting roots are very easy to produce retting roots. it will also cause yellow leaves of tomato plants.

Preventive measures: watering and fertilization should be reasonable and scientific, according to different growth stages of plants, fertilization should pay attention to the balance of nitrogen, phosphorus and potassium, should not be partial application of nitrogen fertilizer, but also pay attention to the supplement of trace elements to promote the normal growth of tomato. Watering should not be flooded, and should be drained in time after the rain to avoid stagnant water retting roots.

2. Element deficiency

Tomato growth and development is inseparable from a variety of trace elements, when the plant is lack of trace elements, rescue will cause physiological diseases, such as magnesium deficiency will lead to old leaves yellowing; zinc deficiency will lead to middle leaf veins green, mesophyll yellow; manganese deficiency will lead to green veins and yellow mesophyll; sulfur deficiency will lead to yellowing of tender leaves.

Preventive measures: in the planting management of tomato, in addition to applying trace elements in the base fertilizer, foliar fertilizer should also be sprayed in time to supplement trace elements in the middle and later stages of planting growth to reduce the occurrence of physiological diseases.

3. Soil salinization

In the continuous cultivation of tomatoes in the greenhouse, the base fertilizer is mostly applied with chicken and duck manure and chemical fertilizer, which will lead to the salinization value of the soil over a long period of time, resulting in inhibition of tomato root growth and, in serious cases, root death, so yellow leaves are a relatively mild symptom.

Preventive measures: uncover the film at the leisure stage in the greenhouse, let the soil be washed by heavy rain or repeatedly irrigate and press salt with river water and well water, add microbial fertilizer during fertilization to regulate the activity of soil beneficial bacteria, and apply acid fertilizer to adjust pH value.

4. Diseases and insect pests

Some diseases can also cause yellow leaves of tomato, such as some soil-borne diseases and aboveground diseases, such as early blight, brown spot, etc., such as early blight, brown spot, etc. cause yellow leaves, such as whitefly, mites, Liriomyza huidobrensis and so on.

Preventive measures: for root soil-borne diseases, high-temperature stew shed can be used in the high-temperature stubble change stage to deal with soil. for ground diseases, it is necessary to spray chemicals in time to prescribe the right medicine to reduce the incidence. Pest control can be combined with physical and chemical control, which can be regarded as within the range that does not affect the normal growth of tomato.

The above is the introduction of tomato yellow leaf causes and preventive measures, hope to help you, want to know more related knowledge, please follow us.