Symptoms and Control Methods of Tomato Leaf Mold

Tomato is a vegetable we often love to eat. But for growers, some diseases can cause tomato yield reductions. It is very headache-inducing. So today let's talk about the control of tomato leaf mold. Let's take a look together

1. Symptoms of tomato leaf mold

Tomato leaf mold appears on the whole plant. But the most affected place is the leaves. In the early stage of the disease, some chlorotic spots appear on the back of the leaves, and later they become gray or dark purple irregular mold layers. On the front of the leaf, the corresponding parts turn chlorotic and yellow, and in severe cases the leaves often become dry and curled.

2. Harm of tomato leaf mold

Tomato leaf mold mainly harms the leaves, and in severe cases also harms the stems, flowers and fruits. In the early stage, yellow-green spots with indistinct edges appear on the front of the leaves, and a gray-white mold layer appears on the back of the leaves, after which the mold layer becomes light brown to dark brown. When humidity is high, mold layers can also grow on the diseased spots on the leaf surface. The disease often starts from the lower leaves and gradually spreads upward. When the disease is severe, the mold layer covers the back of the leaves, the leaves bend, and the leaves of the whole plant become yellow-brown and dry.

3. Conditions for the occurrence of tomato leaf mold

Tomato leaf mold likes high temperature and high humidity environments. The climatic conditions for the disease are 23 degrees, with relative humidity above 95 percent. In Zhejiang and the middle and lower reaches of the Yangtze River, the main peak periods of the disease are July in spring and November in autumn. The susceptible growth period of tomato is the flowering and fruiting period. Fields with many years of continuous cropping, poor drainage, poor ventilation, overly dense field conditions, and relatively high air humidity have more severe disease. In years with low temperature and much rain in early spring, or continuous rainy or rainy years, the disease is more severe. In autumn, in years with excessively high late-autumn temperatures and much rain, the disease is more severe.

4. Control methods for tomato leaf mold

1. Reasonable crop rotation

Tomato is best rotated with non-solanaceous crops for more than three years to reduce the base number of pathogen sources in the soil. At the same time, choose disease-resistant varieties and strictly control seedling raising. Among the varieties promoted on the market, those with high resistance to leaf mold include Jiafen 15, 16, etc., which can be selected according to local conditions.

2. Strengthen management

Ventilate in time, properly control watering, and ventilate promptly after watering to reduce moisture. Adopting the cultivation method of double-ridge mulching and irrigation under the film can, in addition to increasing soil moisture, also significantly reduce the air humidity in the greenhouse, thereby inhibiting the occurrence and infection of tomato leaf mold, and plastic film mulching also effectively prevents the spread of pathogens in the soil.

Alright, the above is the control of leaf mold brought to you by the Tuliu.com editor. See you next time