What is a necessary precaution when keeping host plant stems in water inside a rearing container?

Answer

Securing the water container to prevent drowning

When placing stems in water within a rearing enclosure, precautions must be taken, such as covering the open top of the water container, to prevent the caterpillars from drowning in the water.

What is a necessary precaution when keeping host plant stems in water inside a rearing container?

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