How to use poison bottles for plant disease specimens?

Poison bottle: it is specially used to poison insects. Except for the live worms that need to be kept for observation, all the others are killed, and the faster they are poisoned, the less likely the specimens are to be damaged. Poison bottles are generally wide-mouthed bottles or finger tubes, which can be sealed tightly. Spread a layer of toxic agent potassium cyanide or sodium cyanide on the bottom, and spread a layer of sawdust on it for compaction. The thickness of two layers is 5 ~10 mm. Add a layer of gypsum powder (about 5 mm thick) to the top and flatten it, then sprinkle water evenly with a dropper or brush to harden the gypsum into a whole piece.

Cut two pieces of absorbent paper (or thick white paper) with the same size as the inner diameter of the bottle and spread it on the gypsum, and the poison bottle can be used.

You can prepare several poison bottles of different sizes as needed. Moths and butterflies should not be put in the same bottle with locusts, beetles, mantis and other insects to avoid damaging scales. Because the poison bottle contains highly toxic drugs, special attention should be paid to safety when using it. The outside of the poison bottle should be marked "highly toxic", and the bottle cap should be tightly closed at ordinary times. When it is broken, it should be properly disposed of (if it can be buried nearby in the wild).