The latest control methods of watermelon phytotoxicity

The fruit surface of watermelon is smooth and the pericarp is very thin, because this characteristic determines its sensitivity to pesticides, so it is very prone to drug damage in the process of watermelon planting. So how to prevent and cure the drug damage of watermelon? Come and have a look with the editor.

1. Symptoms of drug damage

There are acute and chronic drug damage, acute is a few hours to 3-4 days after spraying obvious symptoms, rapid development, such as burn, withering, fallen leaves, falling flowers and fruits. In chronic drug damage, after spraying, it will cause obvious reaction for a long time, because the physiological activities are inhibited, such as poor growth, abnormal leaves, delayed ripening, poor flavor, grain dissatisfaction and so on. In particular, the leaf performance is extremely obvious and common, such as the emergence of colorful spots, local tissue scorched, perforation or shedding, or leaf yellowing, chlorosis, thickening deformity and so on.

2. Etiology

After spraying to the leaves, pesticides will invade from stomata, water pores and wounds, and sometimes from the epidermis of branches and leaves, flowers and fruits. When the pesticide is applied, the particles will directly block the stomata and water pores on the leaf surface, or directly enter the intercellular space in the tissue, resulting in inhibition of respiration, transpiration and assimilation of crops. After entering the crop tissues and cells, the medicine will have a chemical reaction with some Nei Han Wu, resulting in the destruction of physiological function, abnormal symptoms and physiological metamorphosis.

3. Prevention and control methods

Choose relatively safe pesticides, try to avoid spraying in the period of weak drug resistance of crops, generally seedling stage, flowering and fruit setting stage are most prone to drug damage, so we need to pay special attention to. Correctly grasp the pesticide application technology, strictly according to the concentration, dosage, to achieve scientific and rational mixed use, to avoid applying in the hot noon, because in the strong light and high temperature, the crop drug tolerance is weakened, the chemical activity is enhanced, and it is very easy to produce drug damage. When the seed buds and seedlings were slightly damaged, the early development of seedlings could be transferred to normal growth by strengthening management and proper application of nitrogen fertilizer. When the leaves and plants are seriously damaged, they should be irrigated in time, increase the application of phosphorus and potassium fertilizer, middle tillage to promote root development, enhance the ability of recovery, if sprayed wrong, can spray a large amount of water, and pay attention to drainage and irrigation.

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