Causes and control measures of tomato phytotoxicity

In the process of tomato growth, pesticides are inevitably used, and the phenomenon of drug damage may occur in the process of using pesticides, which has a great impact on tomato growth. So how to solve the drug damage in tomatoes? Let's take a look at the detailed introduction.

1. Symptoms of drug damage

Drug damage can be divided into acute and chronic, acute symptoms generally appear in a short time, generally manifested as leaf spots, green loss, flower and fruit drop and other phenomena. Chronic symptoms generally appear 10 days after spraying, such as leaf yellowing, fruit deformity, small fruit, bad fruit and other symptoms, which seriously affect the fruit variety, reduce the commerciality, and have a great impact on the income and assets of farmers.

2. Causes of drug damage

There are five main causes of drug damage, one is the misuse of insecticides, such as spraying herbicides to kill insects and sterilization, and the other is excessive concentration or continuous repeated spraying, which will affect the water loss of leaf cells, yellow leaves and green loss; third, when sprayed under the condition of high temperature, the medicament will evaporate and mix with water in the air and attach to the leaves, causing drug damage. Fourth, spraying low-quality pesticides, there will be drug damage; fifth, spraying chemicals is uneven, there is a phenomenon of repeated spraying in some places.

3. prevention and control measures

When using pesticides, we should choose the right medicine, prescribe the right medicine to the case, choose the appropriate pesticide when spraying, master the application amount of pesticide, and should not blindly increase the dosage of pesticide. In the mixed use of drugs must be scientific and reasonable, long-term use of a single variety of agents, it is very easy to produce drug resistance, so it is necessary to rotate the use of drugs. Spraying herbicides should not be carried out at high temperature to avoid evaporation, and it is not suitable to spray herbicides on leaves. After the occurrence of drug damage, it is necessary to spray clear water in time, reduce the chemical concentration, reduce the drug damage, at the same time increase the application of phosphorus and potassium fertilizer, increase plant disease resistance, make it recover as soon as possible, and can also spray plant growth regulators to alleviate drug damage.

The above is the introduction of tomato drug damage causes and control measures, hope to help you, want to know more related knowledge, please pay attention to us.