Orthene - FAQs

Q. What is Orthene used for?
A. Orthene is Acephate that is used to help control aphids, spider mites, ash sawfly, and many more insects on non-fruit-bearing deciduous trees and shrubs.

Q. What type of insects does Orthene control?
A. Aphids, bagworms, birch leafminer, tent caterpillars, lace bugs, ash sawfly, box elder bugs, leafhoppers, thrips, and two spotted spider mites.

Q. How is Orthene applied?
A. We inject Orthene into the ground around the canopy of the tree where the roots can uptake the product and push it to the leaves. The insects eat the leaves and then die.

Q. How long does Orthene last?
A. Orthene is a fast acting product that lasts for about three weeks.

Q. By using Orthene will this prevent insects from infecting the tree again?
A. No; Orthene is fast acting and it should be used when you have an infestation that requires immediate control. This treatment is only going to control insects that are on the tree when it is applied and up to three weeks after the application, but it will not prevent more insects from coming back. If you are looking for longer control, Merit applied in the spring or late fall will give control for a full year.

Q. How toxic is Orthene?
A. Legally we cannot answer this question. Please refer to the label and MSDS on the website so you can research the information and make an educated assessment about the product.

Q. Why is injecting Orthene into the ground better than the sprays other companies use?
A. By injecting Orthene into the ground, we are ensuring that the product is getting to the target tree and not drifting to non-target plants like gardens or other trees. This process also allows us to apply it on a rainy or windy day. It also does not affect beneficial insects and other creatures and people.

Q. When should we have the Orthene treatment done?
A. Orthene should be applied any time that there is insect pressure on a deciduous tree or shrub that you want to protect. Note: Orthene does not work on coniferous trees like pine, spruce, and fir.

Q. I had the treatment done and I still see the sticky substance on the leaves does this mean that the treatment didn’t work?
A. The sticky substance is the honeydew from the aphids and is not a telltale sign that you still have aphids. You should go out and look at the underside of the leaves and if you do not see any aphids moving then the treatment has worked. You can get rid of the sticky substance by washing the leaves with water or just leave it because it will not do any damage to the tree.

Q. How can I tell if I have spider mites or aphids on my tree?
A. We have a chart and links on the website for each type of insect but the most common are spider mites and aphids

Q. Is there anything I should do for the tree after the application is performed?
A. You do not have to do anything for the tree, however, you could water the soil around the base of the tree to help it uptake the Orthene.

Q. How long do I have to stay off the lawn after the application is performed?
A. You do not have to stay off the lawn after the application is performed because it is all underground. If you want to be extra cautious you should stay off the lawn for 24 hours.

Q. What trees are most susceptible to insect pressure?
A. Many trees have many different problems. We have a chart that explains what species of trees are affected by what type of insects.

Q. I have insects on my tree now is Orthene or Merit the best treatment?
A. If you have insects on your tree now you should us the product Orthene. Merit is too slow and will not begin to control the insects for 3-8 weeks after the application is performed. If you want to be proactive and prevent insect pressure you should have Merit applied in the early spring or late fall.

Q. Does Orthene work on all insects.
A. No; Orthene does not work on borers, scales, and a few other damaging insects. It also does not work on coniferous trees like pines, firs, and spruces.

Q. Will you treat fruit trees with Orthene?
A. No; we do not apply any synthetics to fruit trees because it contaminates the fruit. Even if you do not plan to eat the fruit, it is possible that an animal or child will. Consider an application of EcoTrol to control insects on fruit trees.