What term describes a substance that is injurious or toxic to plants?

The term that describes a substance that is injurious or toxic to plants is "phytotoxic." Phytotoxicity refers specifically to the negative impact that certain chemicals, including various herbicides and pollutants, can have on plant health and growth. This can manifest in various forms, such as leaf burn, stunted growth, or even plant death.

Understanding this term is crucial in the context of pest control and agricultural practices, as it highlights the importance of using substances that are effective against pests while minimizing harm to desirable plant species. For example, some herbicides are designed to target specific weeds without causing phytotoxic effects on crops.

Other terms in the list refer to different types of substances. Fungicides are specifically designed to kill or inhibit the growth of fungi, piscicides target fish, and herbicides refer to substances used to control or kill unwanted plants, which can sometimes be phytotoxic to some degree. Recognizing the distinctions among these terms is essential for effective pest management and ensuring the safety of the environment.