1. Pick up caterpillars and beetles by hand and throw them in a bucket of soapy water. Spread a tarpaulin under the infested trees or shrubs and shake off the insects. To eliminate the caterpillars, spray on the whole plant surface a solution based on Thuringian bacilli (bacteria producing an insecticidal toxin), or, at nightfall, cut the branches where they have settled and throw it all in. fire or in soapy water.

1. To protect your plants from cutworms or other insects living under the ground, squeeze a few centimeters into the soil of aluminum foil rolls or half-boxes of frozen juice emptied of their contents.

1. Dislodge aphids and mites by watering your plants with a powerful stream of water (avoid on young shoots or fragile plants) or spray water on the leaves – not forgetting the underside – at regular intervals.

1. Plant wild flowers. Since biological warfare is a constant war, recruit predatory insects, those who feed on pests. How? By planting flowers or plants belonging to the family of carrots, mustard, mint or daisies. A few square meters will be enough to attract predatory insects. Make sure the area is exposed to the sun for a good part of the day and well ventilated (to limit disease) and prepare the soil to prevent the flowers from being invaded by unwanted species. To attract good insects, plant flowering plants rich in nectar: ​​clover, goldenrod, alfalfa, yarrow, etc. These plants will also seduce butterflies and moths,

In time, your garden will become the host of very useful species 
• The carabes. These black or brown insects hide under stones or stumps during the day and hunt at night. They feed on soft insects: cutworms, slugs, caterpillars, legionaries and sponges.
• Parasitic wasps. Their larvae are fond of aphids and caterpillars.
• Hoverflies. They look like little wasps or young bees, but do not sting. Their larvae are fond of mealybugs. In addition to being excellent pollinators, hoverflies lay their eggs in aphid colonies.
• Lacewings.Green or brown, depending on the species, they are recognized by their large diaphanous wings. Their larvae feed on aphids, thrips, mealybugs and mites.
• Ladybugs. They are fond of aphids and mealybugs.
• The praying mantis. These species of large grasshoppers watch for their flying prey by adopting the position of a praying nun, hence their name. Their role is, however, controversial in biological control because they feed on all insects, harmful or not.