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“Envidor has given us very excellent control of rust mites,” says Victor French, Ph.D.,
citrus research entomologist at Texas A&M Citrus Center in Weslaco. "It provides good
knockdown, good immediate control and good residual control," And with Envidor, he's
seen control up to 90 days.
Dr. French sees a very good fit for Envidor in the marketplace, too. "Our growers are
very enthusiastic about another miticide available. It will be very important for resistance
management, and will be well received," he says.”
Dr. Victor French
Texas A&M University
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“Michael Rogers Ph.D., assistant professor of entomology, University of Florida Citrus Research and Education Center, has tested Envidor® 2 SC Miticide during two seasons of field trials against rust mites in Hamlin orange and in nearly 18 months of laboratory trials.
“Envidor works really well. In the field Envidor performed as well as Agri-Mek®, which is the industry standard,” he says. “In 2004, the 13-ounce rate of Envidor gave 44 days of control. It could have given more, but Hurricane Charlie blew the trial away and we couldn’t collect any more data. Envidor also gave good control with oil and with GEM® Fungicide.”
“In 2005, Envidor alone at 13 ounces gave control out to about 60 days when the rust mite population collapsed in our untreated control plots and comparisons could no longer be made. Envidor routinely gives 50 to 60 days of control.”
Envidor will also help with resistance management. Because Envidor provides another control option and mode of action, it will increase the life span of other citrus miticide products, he points out.
“One important thing to point out is that it takes seven or eight days for an application of Envidor to kill rust mites. During this time you will still see rust mites present, but the females can no longer lay eggs and the immatures that are hatching will die off.””
Dr. Michael Rogers
University of Florida
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“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 levelsof 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.””
Joby Sherrod
DUDA
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“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.”
“Envidor’s 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.””
Rick Hilton
Oregon State University
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“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, 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 Envidor's strengths 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
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“"In 2004 and 2005 we had excellent trials with Envidor. It was near the top of our list in terms of performance," says Dr. Larry Hull Ph.D., Pennsylvania State University professor of entomology. As the director of the Fruit Research and Education Center at Biglerville, Penn., he has studied Envidor on European red mites on apples.
"The last couple of years we evaluated the 18-ounce rate, which gave 35 to 40 days of control under our conditions," he notes. "That's the most you can ask for. By then the natural enemies have taken you past the point of mite populations rebounding as long growers do not destroy their natural enemy complex in their orchard blocks."
"We apply Envidor primarily as an adulticide," he explains. "We treat when populations are from five to 10 mites per leaf and take a three-day evaluation of activity. Envidor has shown a little slower activity. With Envidor you need to take a more serious look at seven days."
"I see some effect on the beneficial complex," he adds. "We classify Envidor as having slight toxicity on predatory mites."
New chemistries, such as Envidor, offer excellent opportunities to manage resistance, he says. "We are always stressing rotation of chemistries to growers," he points out. And Envidor definitely fits in with its unique mode of action. Growers have lots of options and we encourage them to explore what's good for different mite populations. We're alerting growers that with Envidor there is another choice for chemistry rotation."
"I had it (Envidor) as a numbered compound in 1998 or 1999 and I've been working with it ever since. We feel very comfortable with the performance of Envidor," he concludes.”
Dr. Larry Hull
Pennsylvania State University
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