QuestionsHow to growVegetable GrowingWeeds, Pests and DiseasesBug spray prevent 0 Vote Up Vote Down Harriet Browne asked 14 years ago Is there anything on the market which you spray on veg or plants as a preventitive against bugs? something similar as the way simazine works? Also is derris liquid and dust gone off the market? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago There is no preventive treatment for insects and such is not desirable as it would damage wildlife. Simazine and derris have both been taken off the market by the EU for similar reasons.