1. Mixture of pesticides is divided into the following cases:
There are a large number of pesticides in the pesticide varieties produced in China, and the phenomenon that the fungicides are mixed with fungicides or other types of pesticides is also common. The purpose of using mixed or mixed use is to expand the scope of prevention, delay drug resistance, increase efficiency, reduce the cost of medication, save labor and time.
(1) Combination of fungicides and fungicides and insecticides
When more than one disease occurs on a crop at the same time, it is necessary to spray two different fungicides, sometimes it is sick and insects, and it is necessary to spray fungicides and insecticides. In order to save the number of sprays, it is usually taken Two fungicides or a combination of fungicides and insecticides. For example, in cucumbers cultivated in protected areas, whitefly or aphid and downy mildew, gray mold and the like often occur at the same time, generally the agent for controlling whitefly or aphid (imidacloprid) and the agent for controlling downy mildew (perforated nail) Ingredients such as creamer and mancozebide or a drug for controlling gray mold (isourea, nicotinamide, fludioxonil). In the protected cultivated tomato, whitefly and leaf mold, gray mold, late blight, etc. may occur at the same time, and the insecticide may be mixed with the fungicide.
(2) Combination of fungicide and biological growth regulator
In order to achieve the purpose of preventing disease or enhancing plant disease resistance, promoting plant growth or cultivating strong seedlings, a fungicide may also be mixed with a plant growth promoter. For example, farmers generally combine auxin 2,4-D with a fungicide for controlling gray mold (prochlorazenitrile, pyrimethanil, etc.) and then apply tomato flower buds (or scented flowers).
(3) Combination of fungicide and foliar fertilizer
Foliar fertilizers and fungicides containing various trace elements and plant growth regulators necessary for plant growth or development may also be mixed, but it is to be noted whether their interaction is not harmful to the performance and action of the fungicide. Mixtures of fungicides with plant growth regulators or micro-fertilizers must also pay attention to the interaction between fungicides and growth regulators. It is best to compare them carefully beforehand to confirm that there are no side effects and then mix them.
(4) Combination of fungicide and tank mixing aid
Many surfactants such as silicone and bactericides can be mixed and used to improve the wettability of the liquid on the surface of the crop, increase the permeability of the agent and improve the effect. It is called a tank mixing additive, and the general dosage is 0.05% to 0.10. %. Silicone surfactants are used in an amount of about 0.03% by weight, and are readily miscible due to their ease of degradation in water.
(Note: Some farmers like to mix and spray a variety of pesticides in one go in order to save the time of spraying, called "four in one", "one spray and more defense" ..., this method needs to be used with caution, maybe It is dangerous or uneconomical, causing phytotoxicity to plants and wasting some of the chemicals that are not needed. Therefore, bactericides should not be mixed.