What are organochlorine pesticides and nitro-containing compounds?

① Chlorothalonil: It is a 75% Daconil wettable powder. When spread on leaves it has translaminar movement, is highly resistant to both weather conditions, and has high persistence. It has a controlling effect on diseases such as Colletotrichum spp., Septoria spp., and Cercospora spp., and belongs to the protective fungicides. Its efficacy is short during high-temperature periods, and it can be mixed with many pesticides and fertilizers. During hot and humid periods, if the dosage is improper, there is a risk of phytotoxicity. When used for disease control, the diluted solution must be sprayed on both the upper and lower surfaces of the leaves and on the diseased areas to improve the effect. ② Chlorothalonil plus thiophanate-methyl: It is made by mixing 20% thiophanate-methyl with 50% chlorothalonil to form a 70% Meiyouren wettable powder. It has excellent efficacy and is a broad-spectrum, powerful protective and directly therapeutic fungicide. It can simultaneously control many diseases; after spraying it can strongly penetrate and kill pathogens, and prevent the pathogens from continuing to spread and expand. As for the method of use, whether by spraying or soaking. Drenching is also acceptable; it is a safe, effective, low-toxicity fungicide. It is effective against diseases caused by Cercospora spp., Colletotrichum spp., Septoria spp., etc. When using this agent, avoid mixing it with alkaline pesticides and fertilizers. When spraying, apply it evenly to both the upper and lower surfaces of the leaves and the whole plant, and add a spreader-sticker to achieve a powerful fungicidal effect and save on the amount of pesticide.