Insecticides are substances used to mitigate insects of one or more species. They are used for controlling pests that infest cultivated crops but they have other uses as well, such as eliminating insects that spread diseases.

Fungicides are a type of pesticide that can destroy fungi or inhibit their growth. [1] In an agricultural context they are used to reduce crop losses by preventing or controlling plant disease caused by fungi.

Herbicides, also commonly known as weed killers, are substances used to control undesired plants, also known as weeds. Selective herbicides control specific weed species.

Plant growth regulators are commonly used to improve crop yields by increasing the rate of photosynthesis, promoting fruit and flower production, and preventing pre-harvest losses.

FERTILIZER

---

A fertilizer or fertiliser is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients.