When pesticides are attacked, the pests cannot die. What is the reason? The reason why pesticides can not be effective, in addition to the factors of pesticides themselves, unscientific methods of use can also directly affect the efficacy of drugs. Usually there are the following situations:
1. There are no pests to fight drugs. In general, no pests are found. Most of the medicines we use now are contact poisons or stomach poisons, which means that we have to contact the body of pests or be swallowed by insects to enter the body. We advocate the use of drugs in the early stage of pests because it can maximize the role of pesticides and reduce the damage of plants.
Because the disease has a certain incubation period, when we found that the plant showed symptoms of damage (such as leaf spots, leaf blight, etc.) when the bacteria had invaded the plant for a period of time, so we advocate early prevention of diseases, but should master all kinds of diseases The timing and regularity of the occurrence of targeted drug spraying prevention.
2. Pesticides, pesticides, fungicides, rodenticides, herbicides, etc., which are commonly used in pesticides, are used in most cases. Some production units are eager to treat after they have found that the plants have suffered symptoms. Buying pesticides will spray them, and even spraying them will not work. The reason is that the disease has misused pesticides. Such an example is not uncommon.
Therefore, when a plant suffers from symptoms of damage, we must first judge whether it is a disease or an insect, and what kind of disease it is. If you cannot diagnose yourself, it is advisable to ask a professional to use the medicine after guidance.
3. Unexplained indiscriminate selection of medicines The current market for pesticides is dazzling, and it is easy to choose the wrong medicine without a certain amount of expertise. We all know that the pathogens of plant diseases are fungi, bacteria, viruses, etc. Their drug selection is completely different. If we see the disease symptoms of plants and do not understand the types of pathogens, such as viral diseases use fungicides or bacteria. The medicine is completely useless. It not only wastes money but, more importantly, it delays treatment time and often results in irreversible consequences. Therefore, we must treat the disease symptomatically.
4. Not using drugs for time is not necessarily effective when all pests spray medicine. This is determined by the occurrence and development of diseases and insect pests. For example, the common scale insects have a waxy layer for most of their life. Protective layer, so that the liquid can not enter the body to play a role, when spraying is almost impossible to work. Therefore, we choose to apply the drug in the newly hatched nymph stage without a protective layer. This effective time is often very short. Therefore, in addition to selecting the right medicine, the time for applying the medicine should also be selected.
5. Do not read that the random drug often encounter such a situation, in order to hurry to cure plant diseases and insect pests or fear of drugs is not good, at the time of dispensing arbitrarily increase the liquid concentration, so that plants are not only easy to produce drug resistance, but also easily produce drugs Harm is a very wrong practice. In contrast, reducing the amount of drug at random can not achieve the control effect.
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