A pesticidal composition comprising (i) one or more essential oils selected from tagetes oil or a thymol containining oil such as thyme oil, or a mixture thereof, or components thereof which have insect repellent or deterrent properties, which have insect repellent or deterrent properties, wherein the total amount of such oil present does not exceed 10 % w/w; (ii) an agriculturally acceptable carrier oil and (iii) an emulsifier. In particular, the composition further comprises a compound, which remediates symptoms of viral infection, such as wintergreen oil. Use Of Compositions of this type in agriculture controls pests whilst reducing the amount of essential oil required. Furthermore, a combined effect of controlling insects, preventing reinfestation and viral symptom remediation is obtainable.