How often should preventative pesticide treatments be applied?
If Sevin SL is applied correctly, it is effective as a preventative treatment for one season (the label states that no more than two applications per year should be applied). According to the Astro label, users should apply no more than 2 lbs of active ingredient/acre/year. Consumers can contact the manufacturers of these products for more information. Pesticide labels are legally binding documents and all pesticides must be applied in compliance with product label directions.