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Loren from Silverhill writes

If treating for Moths, what is the mixing ratio of Sevin SL Carbaryl Insecticide per gallon of water if I need to treat a little over 1 acre as a broadcast spray? ...


Per the product label, Sevin SL Carbaryl Insecticide is limited to spot treatments ONLY for residential turfgrass, it cannot be sprayed as a broadcast application as you are wanting to do. If treating Sod Webworms (lawn moths), the amount of water will vary depending on the layout of the area, how wet or dry the soil is and also the thickness of the thatch layer. Sod Webworms are beneath the soil surface so it is important to use a sufficient amount of water to get the active ingredient into those areas under the ground surface. 

The mix rate is 4.4 to 6 fl oz per 1,000 sq feet. To determine how much water you need, we would suggest doing a “mock” application filling your sprayer with water doing a test run to see how much water it will take to spray 1,000 sq ft. Every yard is different and since you are needing to get the product below the soil surface, it can take 1 gal, 1.5 gal, or 2 gal to thoroughly cover the area, this is why a “mock” application is helpful. Once you determine how much water is needed, then you will use 4.4 to 6 fl oz of Sevin SL Carbaryl with that amount of water to treat a 1,000 sq ft area. 

Two alternative recommendations for broadcast treatments would be Talstar P or Talstar XTRA Granules. We recommend these in our Sod Webworm Treatment Guide 

Talstar P is a liquid concentrate and will treat for Sod Webworms as a broadcast application and  Per the product label, mix at 0.25 fl oz to 1.0 fl oz per 1,000 sq ft and use the higher rate if grass height is over 1 inch with sufficient water amounts to penetrate the soil. Talstar P can be applied every 30 days for outdoor control. 

Talstar XTRA Granules, are labelled to treat Sod Webworms at a rate of 50 to 100 lbs per acre or 1.15 to 2.3lbs per 1,000 sq ft. These granules need to be watered in with ¼ inch of rain or irrigation immediately after applying to active the granule. After the application has dried, the granules will last 2-4 months in the soil. 



Answer last updated on: 10/24/2018

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