An insecticide is a molecule used to protect crops against insects. They include ovicides and larvicides used against the eggs and larvae of insects respectively
Weedicide kill specific targets, while leaving the desired crop relatively unharmed. Some of these act by interfering with the growth of the weed.
Herbicides, also commonly known as weedkillers, are pesticides used to kill unwanted plants. Herbicides used to clear waste ground, industrial sites
Plant Growth Regulators
Plant hormones (also known as phytohormones) are chemicals that regulate plant growth, which, in the UK, are termed 'plant growth substances'.
Fungicides are biocidal chemical compounds or biological organisms used to kill or inhibit fungi or fungal spores. Fungicides can either be contact, translaminar or systemic.