Everything else is better than using poisonous chemicals!
Sometimes it can help to add natural enemies of caterpillars for example beetles of the family Carabidae.
For example the genus Calosoma is known to hunt caterpillars.
@jaki01 thanks for the suggestion this is interesting. but to find this Calosoma insect is also difficult to eradicate the caterpillars. in the garden I never saw any of these Calosoma wandering around. Will I have to pull out one by one the caterpillars from the spinach leaves? 😊 I think it's impossible either.
@jaki01 thanks for the suggestion this is interesting. but to find this Calosoma insect is also difficult to eradicate the caterpillars. in the garden I never saw any of these Calosoma wandering around. Will I have to pull out one by one the caterpillars from the spinach leaves? 😊 I think it's impossible either.
Actually, Calosoma was just a possible suggestion. At first you had to find out which Carabidae species are living in your area ...