(1) Misuse on sensitive crops. Most pesticides have their corresponding sensitive crops to prevent misuse. (2) Medication at the sensitive stage of the crop. Different crop stages have different resistance to pesticides. Generally speaking, the resistance of seeds is the strongest. Most crops are susceptible to phytotoxicity at the seedling stage and flowering stage. Gracilaria plants are sensitive to chemicals at the booting stage, and they are sensitive to pesticides from the tillering stage to the booting stage. Poor sensitivity. (3) High temperatures, high humidity, and strong sunlight are prone to injury. For example, the use of lime sulfur at high temperatures above 32 °C can easily produce phytotoxicity. There are also a small number of agents that are susceptible to phytotoxicity when used at low temperatures. (4) Excessive doses, high concentrations, or improper application methods. The tolerability of crops to pesticides is limited. If the amount of pesticides used is too high or the concentration is too high, the crops will be phytotoxic. (5) inappropriate mix. Each pesticide has a certain degree of combining power, and misuse can often cause injury.
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