Option 1: Herbicides are chemicals that are specifically designed to target and kill weeds. They do not have any effect on other organisms such as insects or fungi. Therefore, this pairing is correct.

Option 2: Fungicides are chemicals that are used to control fungal infections in plants. They are specifically designed to target and eliminate fungal pathogens, helping to protect the plant from further damage. This pairing is also correct.

Option 3: Insecticides are chemicals that are used to control insects, including avians and ants are not insects. Avians are birds and ants are arthropods. Therefore, this pairing is NOT correctly matched.

Alert - correct answer should be "Option 3: Insecticides are chemicals that are used to control insects, including ants. However, avians are not insects but are birds, so this pairing is NOT correctly matched."

Option 4: Antibiotics are substances that are used to treat bacterial infections. They are not specifically designed to target plant pathogens, whether they are bacterial or not. Therefore, this pairing is correct.