Pesticides effective against the most common plant infestations, they can also be prepared at home with simple natural ingredients and in total safety. Certainly your plants will be happier if you prevent them from absorbing complex chemicals that can also be dangerous for humans.
The simplest to use among the pesticides for plants it is garlic (which is notoriously an excellent natural antibiotic for humans as well) because you don't even need to prepare it, just stick a few cloves directly into the earth of the pot. It works well against green lice of roses and does not alter the scent of flowers.
The burial system works even if you use mothballs and camphor as pesticides in particular against the carruga (vulgar name of the phillopertha horticola) which loves to feed on the buds of roses and the roots of many ornamental plants. A few balls in the ground and the plant is protected.
Mulching with coffee grounds is also one of the systems pesticides simple and natural. Explained that mulching consists of creating a protective layer of organic material on the surface of the soil which usually consists of grass, straw or leaves (in this way the dispersion of moisture is reduced and nutrients are provided), coffee grounds can be recycled as a light mulch (thin because otherwise mold forms). This practice works well in the summer to harden plants and keep pests away, particularly on acidic soils that are home to azaleas, rhododendrons, and camellias.
Another very simple system in the field of pesticides natural for plants is to rub lupine beans on the trunk of the plants. It is said that this practice keeps ants away and even some parasites, but here we enter a bit into the sphere of popular beliefs. Instead, it is not popular belief, because it is confirmed by the facts, that the water in which the chickpeas and all the legumes were put to macerate is an excellent fertilizer for citrus fruits grown in pots.
Other systems pesticides natural, but in this case they are preparations, they are the well-known nettle macerate and the less known tobacco macerate. The latter is prepared by mixing 1 liter of water with half a liter of alcon and 2 tablespoons of strong chopped tobacco. After 3-4 days of maceration it is filtered with a sieve and you can start sprinkling on the leaves. This solution is particularly effective against aphids.