I know you can suppress the microbiota of an insect with antibiotics, but I´m am looking for a way to increase it. For example, can I feed an insect with something that helps boost the bacteria like agar or something.
The answer is absolutely yes. There are 3 main ways:
- Faecal transplant: faecal sample from other insect could be transplanted in order to colonize the gastro-intestinal tract
- Injection of bacterial culture into the desired tissue
- Use of functional foods to increase the abundance of specific bacterial genus.
See this review for more detail