Joby Sherrod, Technical Services Manager at DUDA, Felda, Fla., has five years of field experience with Envidor on grapefruit and oranges.
“One of our major pests is the citrus rust mite, and grapefruit is an excellent host for rust mites,” he notes.
“Pesticide resistance management is extremely important for rust mites,” he notes. “The citrus mite’s combination of short generation time and large reproductive potential lends itself to the possibility for resistance development.”
“Having a pesticide with a new mode of action, such as Envidor, adds a new tool to the product rotation and helps avoid resistance issues,” he says. “Envidor is a good thing for the industry. Envidor is an excellent fit with resistance management because it adds another option for a grower to use to vary the mode of action in the field. Envidor is an excellent tool to add to the miticides we have.”
“I’ve seen length of control with Envidor range from 67 to 102 days with 90 days as the most common length of control achieved in my trials. Certainly Envidor has performance comparable to other products. And Envidor has no adverse reaction with non-target pests and no phytotoxic effects.”
Sherrod says the length of control of Envidor didn’t vary with mite population at application. He still obtained control with Envidor on low and high populations. “You can apply Envidor on a population that has reached high levels of more than two mites per lensfield and still expect it to provide residual control of 90 days,” he says.
“Envidor is a very good, very effective miticide. It has a good fit on fresh market grapefruit that is close to maturity when an application of oil is not possible. Envidor is a good choice for that situation.”
Rick Hilton, Senior Research Assistant at Oregon State University’s Southern Oregon Research and Extension Center at Central Point, Ore., has tested Envidor for three years on twospotted spider mites and rust and blister mites on pears.
“Twospotted mites are our major spider mite pest for pears. But in recent years rust mites have become a major problem in pears, too, because they feed on the fruit causing it to russet,” he explains. “It’s a major plus to have a product like Envidor that attacks rust mites.”
“Most of the recent new miticides are effective on spider mites, but few have efficacy on rust mites,” he points out. “Envidor is the first material in nearly 20 years that controls both spider and pear rust mites. It is as good as any new material on spider mites and is the only new material that has good effect on rust mites.”
“I’ve tested Envidor early in the season and at mid-season and it has high activity on both mites in both seasons. Envidor provides good residual control of spider mites and is still active mid-season on rust mites,” he adds.
“A lot of new materials are similar in speed of activity. They all require time to cycle through the mite population. In mid-season, the spider mite population is turning over rapidly. In a few days, the effects of Envidor are readily apparent.”
“The Envidor novel mode of action is a big plus, too,” he says. “And, I really like labels that are one application per year. That reduces the chances of developing resistance.”
“Some of the older miticides will cause a resurgence in spider mite populations,” he notes. “They knock mites down initially then the mites resurge. However, we don’t see that with new products like Envidor.”
Oregon State University
Dr. John Wise Ph.D., is assistant professor, Michigan State University Department of Entomology and research coordinator of MSU Trevor Nichols Research Complex. For four years, Dr. Wise has conducted efficacy trials of Envidor on apples, cherries and blueberries.
“We have tested Envidor for European red mite, two-spotted spider mite as well as apple and blueberry rust mites,” he says. “Envidor controls all of these mite species while other miticides are more selective. One of the strengths of Envidor is its flexibility to be used early or late season. Other products are more limited in their application windows.”
“Envidor has many of the strengths of the long residual, early season materials as well as the late season ‘clean-up’ contact materials. Envidor clearly provides eight plus weeks of residual activity. Its residual activity is equal or better to pyridiben materials.
It doesn't have restrictions on when it needs to be applied because it has activity across multiple life stages and has contact activity,” he explains.
“The novel mode of action of Envidor makes it an effective resistance management alternative,” he adds. “Envidor doesn't have as fast a contact effect but it is not as slow as some alternatives.”
“I'd put it in the category of a top-rated material. Envidor is an excellent material,” he concludes.”
Dr. John Wise
Michigan State University