What brand of dichlorvos is authentic? I want to use it to fumigate insects on tobacco leaves to preserve them.

High-quality dichlorvos include: 77.5% dichlorvos EC produced by Shandong Dacheng Pesticide Co., Ltd., 77.5% dichlorvos EC produced by Hubei Shalongda Co., Ltd. and 77.5% dichlorvos EC produced by Henan Chunguang Agrochemical Co., Ltd. I am an adult in Shandong and used to be an agricultural distributor. I have distributed dichlorvos in Dacheng, Shandong Province and Shalongda, Hubei Province, and the dichlorvos of these two manufacturers have been well reflected here.