Selection of common pesticide spraying time, identification method and meaning of label letters

First, the choice of common pesticide spraying time The weather when spraying pesticides is different, the effect of spraying is not the same.
The types of pesticides are different, and the temperature at which the effects are exerted is also different. For example, the use of dichlorvos, dimethoate, trichlorfon, and ethylammonium phosphate in the range of 20-30 °C is better. The herbicide, stone sulphur mixture and the like are suitable in the range of 15-25 °C.
When the weather is hot, you should choose the application when the temperature is low. It is best to use it on sunny days from 4 to 7 pm, or on cloudy days, but some medicines are different. For example, herbicides and grass dry phosphorus are sprayed when the temperature is high on sunny days. The effect is better than cloudy. The application of Bordeaux liquid on cloudy days is prone to phytotoxicity.
(3) The application of pesticides should be done in the absence of wind or breeze. For example, the use of 2.4-D butyl ester in the windy days will affect the neighboring crops and cause neighbor disputes.
(4) Do not spray on rainy or dew. Because the application of rainfall and dew can dilute the concentration of the drug, reducing the efficacy.
Second, the pesticide appearance identification method How to identify from the appearance, the following methods are available for reference:
(1) phoxim: a colorless, slightly pungent medicinal liquid;
(2) Enemy kill: light yellow or brown liquid with a slight astringency;
(3) Copper sulfate: the sky blue color is a scorpion, tasteless;
(4) Carbendazim: white or grayish white powdery, slightly odor;
(5) Can be mildewed: white powder, with a peppery smell;
(6) Dixon: red solid powdery foam;
(7) Topazin: yellow powdery, slightly peppery;
(8) Herbicide: light yellow with odorous liquid;
(9) Trifluralin: red liquid, yellow after watering;
(10) Bentazon: a light yellow liquid with a peppery odor;
(11) Butachlor: light blue liquid with aroma;
(12) Dimethoate: Light yellow, scented liquid.
The meaning of the letters on the pesticide label (1) pH: indicates the pH, when the pH is equal to 7 is neutral, greater than 7 is alkaline, the higher the number, the stronger the alkaline. When it is less than 7, it is acidic, and the smaller the number, the stronger the acidity;
(2) PPm: parts per million. That is, 1 million parts of liquid medicine, and the powder contains pesticides;
(3) PC: Percent concentration:
(4) Ai: the active ingredient of pesticides;
(5) RD: lethal dose of animals;
(6) RD50: the dose that causes 50% of deaths;
(7) ED: sterilizing lethal dose;
(8) B: Baume degree is the rate of dissolution of the drug solution according to the wave agent. Generally used less, can be found in the Baume meter;
(9) MAC: maximum allowable concentration;
(10) Wt: weight;
(11) SG: specific gravity;
(12) SP: water-soluble powder;
(13) EC: emulsifiable concentrate;
(14) C: granules: such as 5% C (g) or 5% granules.

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