Cause Analysis and Control Measures of Phytotoxicity in Tomatoes

During the growth of tomatoes, pesticides are inevitably used, and in the process of using pesticides, phytotoxicity may occur, causing a huge impact on tomato growth. So how should phytotoxicity in tomatoes be resolved? Let's take a look at the detailed introduction below.

1. Symptoms of phytotoxicity

Phytotoxicity can be divided into acute and chronic. Acute phytotoxicity generally shows symptoms within a short time, usually manifesting as spots on leaves, loss of green color, and flower and fruit drop. Chronic phytotoxicity generally shows symptoms more than 10 days after spraying, usually manifesting as leaf yellowing, deformed fruit, small fruit, poor-quality fruit and other symptoms, seriously affecting fruit quality, reducing marketability, and having a huge impact on farmers' income.

2. Causes of phytotoxicity

There are mainly 5 main causes of phytotoxicity. First, the wrong pesticide was used, for example, a herbicide was sprayed when the goal was to kill insects and sterilize. Second, the concentration of the sprayed pesticide was too high or spraying was repeated continuously; excessive pesticide concentration can affect the water loss of leaf cells, causing yellow leaves and loss of green color. Third, spraying under high temperature conditions; the pesticide will evaporate and mix with moisture in the air, then attach to the leaf surface and cause phytotoxicity. Fourth, spraying inferior pesticides can also cause phytotoxicity. Fifth, the pesticide was sprayed unevenly, with repeated spraying in some areas.

3. Control measures

When using pesticides, choose the right pesticide and treat the specific problem. When spraying, choose the appropriate pesticide to apply and master the application amount of the pesticide; do not blindly increase the pesticide application amount. When mixing pesticides, it must be scientific and reasonable. Long-term use of a single pesticide variety can easily produce resistance, so pesticides should be rotated. Herbicides should not be sprayed at high temperatures, so as to avoid pesticide evaporation, and they should also not be sprayed on the leaves. After phytotoxicity occurs, spray clean water in time to reduce the pesticide concentration and alleviate the phytotoxicity. At the same time, increase the application of phosphorus and potassium fertilizers to increase the plant's disease resistance and help it recover as soon as possible. Plant growth regulators can also be sprayed to relieve phytotoxicity.

The above is an introduction to the causes of phytotoxicity in tomatoes and control measures. I hope it can help you. To learn more related knowledge, please follow us.