devine ang collego are two agricultural substances that are used as

1. biofertilizers
2. natural insectides
3. insect harmones
4. bioherbicides

The correct option is 4.
A bioherbicide is a biologically based control agent for weeds. Among the three major types of pesticides (agricultural pest-control agents) herbicides are used to control weeds, or undesirable plants. (The other major classes of pesticides are insecticides, which control insects; and fungicides, which control fungi. Normally, any pesticide can only be expected to control, but not eradicate, agricultural pests.)