The Sevin Concentrate mix rate is 4 oz. per gallon of water.
Sevin Concentrate would be diluted at approx. 2oz per gallon water.
Sevin Concentrate can provide up to a 3 month residual on lawns and repeat applciations are only needed if renewed insect activity occurs. For lawns, apply 4fl oz per galllon of water per 250 sq ft of lawn.
For best results, apply when no rainfall is expected within 24 hours of the application and when the turf is no taller than 3 inches.
No, Sevin Concentrate is not labeled for spotted lanterfly.
The Sevin product label states: Do not use on fresh/succulent peas and beans. Depending on the veggie treated the PHI or Pre Harvest Interval is 3-21 days before harvest. You can find this chart on the product label. You may also contact GardenTech at 888-558-1990 for further advice about the beans.
Sevin Concentrate would be good to apply before pests are an issue or while they are active in the area, it has a residual of up to 3 months.
When using Sevin Concentrate for Japanese beetles, it would depend on where they are in their life cycle as to how long it takes the product to completely kill them. You should start to see a knockdown in a few days, but reapplications may be needed per the product label.
Sevin Concentrate will treat for spiders and possibly make the area slick so that they cannot web.