| This is true for many insects that are oligophagous or monophagous on plants that contain characteristic chemicals. |
| Psyllids are generally monophagous or narrowly oligophagous with respect to their angiosperm hosts. |
| Polyphagous insects eat many plants that are unpalatable to oligophagous or monophagous species, even though all these insects may receive the same sensory information about plant chemistry. |
| Since most insects are monophagous or oligophagous, the distinctness of the odours of different plants often enables them to locate their specific hosts from a distance. |
| As serious agricultural insect pests, cotton bollworms are euryphagous insects, but oriental tobacco budworms are oligophagous insects. |
| With only a few exceptions, the host plants of the oligophagous beetles are taxonomically related. |
