picraconitine

例句：

1. 1. This pesticide is effective against aphids and whiteflies.
   这种杀虫剂对蚜虫和白粉虱有效。
2. 2.The farmers used to spray this chemical on their crops to protect them from pests.
   农民过去用这种化学物质喷洒他们的作物来保护它们免受害虫侵害。
3. 3. Picraconitine is a common ingredient in many agricultural products.
   吡虫啉是许多农产品中常见的成分。