The farmer decided to protect the grain crop from pests without the use of chemicals (pesticides). What methods will he use for this?

1) Plowing holes of rodents, scaring away granivorous birds
2) The use of natural enemies (parasites and predators) of pests: beetles, birds, dragonflies, ladybugs, bacteria and viruses
3) Distribution of infertile male pests in the agrocenosis (after mating, females do not give birth to offspring)
4) Breeding (or use) of plant varieties obtained as a result of breeding that are resistant to pests.

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