Biological control

摘要

Invasive plants or weeds are usually from 'somewhere else'. These plants are kept in check in their natural environment by being in balance with the soil and weather systems, and also because they are a food source for a range of insects, other animals and microorganisms. Looking in particular at insect-plant relationships, ecologists find that some are very specific, which indicates to me that some herbivores might use chemical signals to detect which plants are the right ones for them.