Method is the most common and important method of application is the use of the mechanical force of a medical device to atomize the liquid and form tiny droplets that are sprayed on the target. Many pesticide formulations are sprayed with water. Before preparing the liquid, the amount of pure pesticide to be used per unit area needs to be calculated based on the amount of active ingredient in the pesticide formulation to determine how much liquid to take and how much water to mix. The amount of water used for conventional spraying is not strictly regulated and is usually determined according to the growth of the plants in the field. A variety of methods are commonly used in production to dilute the spray, such as 50% isobutyl urea wettable powder 800 times liquid to control fine fine leaf blight. When diluted with the multiplier method, it should be noted that when the dilution multiplier is less than 100 times, the amount of water added should be deducted from the amount of medicine.
Powder spraying is a method of applying medicine by blowing pesticide powder out of the equipment with a manual or motorized powder sprayer and wafting it over a short distance to the target surface. Powder spraying is easy to operate, does not use water, is highly efficient, is safe for crops, does not add to the humidity of the environment, is suitable for use in protected areas with closed environments, saves medicines, and increases deposition; on the other hand, because it does not add additional humidity to the environment, the likelihood of disease is reduced in comparison with spraying methods. The disadvantages of powder are high drift, poor adhesion when used in the field, wind and rain can dislodge powder particles from the target, and the conditions of use should be strictly controlled so that more powder falls on the control target.
The seed mixing method involves mixing the seed with the drug so that the seed is covered with a layer of powder, thus killing the germs carried by the seed or protecting the seed from pests and diseases in the soil. There are two kinds: the dry method and the wet method. The dry method is dry mixing with powder, where the seed and the measured drug are mixed in a container so that the powder adheres uniformly to the seed, and the drug enters the soil with the seed after sowing. The wet method is spraying a liquid made from emulsifiable oil, wettable powder, suspension, etc. It is placed on the seed pile and the seed is turned over as it is sprayed to give a uniform dosage. After wet mixing, the seed is usually packed to kill pathogenic bacteria that have invaded the seed coat. After sowing is a sensitive period for seed germination and is susceptible to drug damage, so the drug should be used with caution.
The poison bait method is to use wheat bran, soybean cake and grain seeds, which pests like to eat, as bait, add an appropriate amount of water, mix well, and then add pesticides that have a gastric toxic effect. Poison bait is mainly used to control underground pests such as golden needleworms, grubs, grubs, tigers and other underground pests, and proper application can achieve good control results. Poison bait can be buried in the soil along with the seeds when sowing, and can also be sprinkled around the base of the seedling stems. Covering with a small amount of soil can prolong the efficacy. Especially when made into a poison bait, it must be buried in the soil when applied to avoid harming poultry and birds. The bait can also be made from chopped fresh grass and wild vegetables. Trichlorfon and phoxim are the most commonly used agents for making poison bait.