We would suggest contacting the manufactuer of the Acephate 97 UP directly to find out how long you would need to wait and if there are any measures you can take to break the product down in the soil. You can reach United Phosphorous Inc at 800-438-6071.
Acephate 97UP Insecticide should only be applied to dirt/soil when using a drench.
Acephate 97UP Insecticide is not labeled for applications to marijuana. Please provide the targeted pest for additional information on treatment options. Please also include any other plants, trees, fruits and vegetables that you will be treating.
Acephate 97UP Insecticide is not labeled for use on areas where you intend to plant potatoes or in areas where potoatoes already exist. If you would like to give us more information on the pest(s) you need to treat, we will be happy to recommend an alternative product.
According to the product label, the Acephate 97UP Insecticide is for application only to NON-bearing trees and vines in nursery fields or in NON-bearing orchards. Do NOT apply to interplants or single trees. Unfortunately, there are not many options with this type of weevil, but you may also want to look at the Zylam which can be used to spray the tree and used to treat the soil to kill the immature larvae. It will not sterilize the eggs. Also, please refer to your local cooperative extension office who work with local universities and normally have entomologists, arborists etc or a local nursery as well who may be more knowledgeable on this type of problem.
According to the Ornamental Trees and Shrubs Table on page 19 of the Acephate 97UP Insecticide product label, you would use 0.5lb (8 oz) per 100 gallons of water and apply when insects first appear. This would break down to .005lbs or .08 oz per gallon of water.
You will use between 4-8 oz of Acephate 97UP Insecticide in 100 gallons of water depending on what you are treating for. Please refer to the product label for complete instructions.
Acephate 97UP Insecticide is not labeled to be used on cucumbers so we cannot recommend or advise on this use. Instead we would recommend something like Bayer Advanced Fruit, Citrus and Vegetable Insect Control.
Can you please tell us what kind of plants you are treating so that we can better assist you? For scale on most ornamental plants, Acephate 97UP is applied at ½ lb (8 oz) per 100 gallons of water and applied as a foliar spray.