Overture 35 WP Insecticide is a new class of insecticide marketed by Valent Professional Products that is active against thrips and caterpillars. This new insecticide contains the active ingredient pyridalyl. This product has an unknown mode of action. Overture is a contact insecticide that is applied as a foliar spray.
Overture is only registered as a greenhouse product. Hopefully, Valent will be able to obtain a registration that will allow Overture to be used outdoors.
Control of thrips is often not seen for 7 to 14 days after treatment. With the recent concern regarding western flower thrips resistance to Conserve, Overture can be a valuable component of a rotation program. Overture should be considered most effective when used as a preventative treatment or as a rotation product. Overture will be an excellent product to use in rotation with Conserve, Pylon and other thrips insecticides.
I have conduced a number of trial evaluating Overture. The results varied slightly depending on the western flower thrips population I was evaluating. However, in all the trials, Overture resulted in a decrease in thrips population. When tested against a western flower thrips population that was resistant to Conserve, the Overture treatments resulted in thrips control after 14 days.
Overture has provided excellent control of chilli thrips. It’s also effective in controlling many lepidopterous larvae, including azalea caterpillar, cabbage looper, tobacco budworm and many more.
For more information on efficacy trials conducted with Overture and other insecticides against chilli thrips, gladiolus thrips, weeping fig thrips and western flower thrips check out a report recently published by the IR-4 Ornamental Horticulture Program. This report can be found at http://ir4.rutgers.edu/ornamental/summaryreports/thripsdatasummary2008.pdf
This report summarizes 26 experiments in which 38 different active ingredients were evaluated.
Showing posts with label western flower thrips. Show all posts
Showing posts with label western flower thrips. Show all posts
Tuesday, November 11, 2008
Monday, September 1, 2008
Insecticide resistance threatens thrips pest management
Western flower thrips (Frankliniella occidentalis) are difficult to control. Their secluded behavior protects them from many insecticides; eggs are inserted into plant tissue, the larvae feed in tight, protected areas, such as flower buds or growth terminals, the pupal stages occur in the soil-media, and the adults feed within protected areas. Thrips may eventually come into contact with insecticides when the right spray equipment and application interval are used. However, chemical control may not be effective when there is insecticide resistance in the population. In response to high levels of resistance recently found in vegetable fields in Florida, Dow AgroSciences has suspended the sale and use of products containing spinosad in Broward County and a portion of Palm Beach County, FL.
This drastic and unprecedented action taken by Dow AgroSciences in Florida is yet another ‘red flag’ indicating the importance and possible consequences of insecticide resistance. We should all view this as an opportunity to take a closer look at our pest control toolbox and make sure it includes sound insecticide resistance management practices, to avoid similar problems in Texas. The good new is that so far, most Texas growers have thrips populations that are still susceptible to spinosad (Conserve®). Earlier this year, I monitored western flower thrips for their tolerance to spinosad. Most of the greenhouse locations sampled did not have large thrips populations. Since these growers primarily use Conserve®, the low populations suggest good efficacy in most cases. However, I did detect very high tolerance levels (immunity) to Conserve at one Texas location. Since then this particular grower has agreed to completely stop using Conserve for at least 6 months.
The most important thing we can do to avoid pesticide resistance is to properly rotate pesticides based on their mode of action. Rotation is essential for all pesticides groups: herbicides, fungicides, bactericides and insecticides. The first evidence of resistance is usually reduced efficacy against the target pest even when the pesticide was properly applied at the recommended rate. If you suspect a pest population is developing tolerance to a particular chemical, continued use or increasing the rate of the product will only accelerate the rate of resistance selection, eventually leading to complete control failure.
To avoid resistance to spinosad, do not make more than two consecutive applications of Conserve®. If additional treatments are needed, rotate with products with different mode of action for at least two subsequent applications. There are a number of effective products available for thrips control. The list includes (but is not limited to) those products containing abamectin, Beauveria bassiana, chlorfenapyr, chlorpyrifos, dimethoate, fenoxycarb, methiocarb, novaluron, pyridalyl and tau-fluvalinate.
If you suspect insecticide resistance or need further information, please do not hesitate to contact me.
This drastic and unprecedented action taken by Dow AgroSciences in Florida is yet another ‘red flag’ indicating the importance and possible consequences of insecticide resistance. We should all view this as an opportunity to take a closer look at our pest control toolbox and make sure it includes sound insecticide resistance management practices, to avoid similar problems in Texas. The good new is that so far, most Texas growers have thrips populations that are still susceptible to spinosad (Conserve®). Earlier this year, I monitored western flower thrips for their tolerance to spinosad. Most of the greenhouse locations sampled did not have large thrips populations. Since these growers primarily use Conserve®, the low populations suggest good efficacy in most cases. However, I did detect very high tolerance levels (immunity) to Conserve at one Texas location. Since then this particular grower has agreed to completely stop using Conserve for at least 6 months.
The most important thing we can do to avoid pesticide resistance is to properly rotate pesticides based on their mode of action. Rotation is essential for all pesticides groups: herbicides, fungicides, bactericides and insecticides. The first evidence of resistance is usually reduced efficacy against the target pest even when the pesticide was properly applied at the recommended rate. If you suspect a pest population is developing tolerance to a particular chemical, continued use or increasing the rate of the product will only accelerate the rate of resistance selection, eventually leading to complete control failure.
To avoid resistance to spinosad, do not make more than two consecutive applications of Conserve®. If additional treatments are needed, rotate with products with different mode of action for at least two subsequent applications. There are a number of effective products available for thrips control. The list includes (but is not limited to) those products containing abamectin, Beauveria bassiana, chlorfenapyr, chlorpyrifos, dimethoate, fenoxycarb, methiocarb, novaluron, pyridalyl and tau-fluvalinate.
If you suspect insecticide resistance or need further information, please do not hesitate to contact me.
Thursday, May 8, 2008
Western Flower Thrips
Western flower thrips are out in full force. If you have sensitive crops it is important not to let your thrips population get out of hand.
Growers were provided a brief relief from western flower thrips when Conserve SC was labeled for ornamental crops. Unfortunately, there are cases being reported of western flower thrips not responding to Conserve label rate applications.
This developing tolerance may be a result of some growers not following the label instructions. The Conserve SC label states “no more than three consecutive applications should be used, nor should there be continuous use for more than 30 days. Consider rotating to a different active ingredient with a different mode of action or use no treatment for the next generation" and "Regardless of the crop or pest being treated (excluding leafminers, spider mites and/or diamondback moths), do not apply Conserve SC more than 10 times in a 12-month period inside a greenhouse or a structure that can be altered to be closed or open”.
Due to the intense nearly year-round thrips pressure some growers face, they are exceeding the three consecutive applications and the 10 total applications per year. One common mistake growers make is applying Conserve repeatedly for thrips and then again for caterpillars, mites, or leafminers. This causes them to exceed the number of total applications that can be made in a year. It is critical to follow the label instructions to reduce the development of resistance in western flower thrips to Conserve.
The recent labeling of Pylon for western flower thrips control provides greenhouse growers (not labeled for outdoor use) a highly effective rotation partner to use with Conserve. As with Conserve it is important to follow the resistance management component of the Pylon label to lengthen the period of efficacy of this product for thrips management.
There are a number of other insecticides that can be used in rotation for thrips management. These include, but are not limited to, Avid, Azain XL, BotaniGard, Enstar II, Pedestal, Mesurol and Orthene.
I am currently working on a project to monitor the tolerance level of western flower thrips to Conserve in East Texas. I will report more on this when the project is completed.
Growers were provided a brief relief from western flower thrips when Conserve SC was labeled for ornamental crops. Unfortunately, there are cases being reported of western flower thrips not responding to Conserve label rate applications.
This developing tolerance may be a result of some growers not following the label instructions. The Conserve SC label states “no more than three consecutive applications should be used, nor should there be continuous use for more than 30 days. Consider rotating to a different active ingredient with a different mode of action or use no treatment for the next generation" and "Regardless of the crop or pest being treated (excluding leafminers, spider mites and/or diamondback moths), do not apply Conserve SC more than 10 times in a 12-month period inside a greenhouse or a structure that can be altered to be closed or open”.
Due to the intense nearly year-round thrips pressure some growers face, they are exceeding the three consecutive applications and the 10 total applications per year. One common mistake growers make is applying Conserve repeatedly for thrips and then again for caterpillars, mites, or leafminers. This causes them to exceed the number of total applications that can be made in a year. It is critical to follow the label instructions to reduce the development of resistance in western flower thrips to Conserve.
The recent labeling of Pylon for western flower thrips control provides greenhouse growers (not labeled for outdoor use) a highly effective rotation partner to use with Conserve. As with Conserve it is important to follow the resistance management component of the Pylon label to lengthen the period of efficacy of this product for thrips management.
There are a number of other insecticides that can be used in rotation for thrips management. These include, but are not limited to, Avid, Azain XL, BotaniGard, Enstar II, Pedestal, Mesurol and Orthene.
I am currently working on a project to monitor the tolerance level of western flower thrips to Conserve in East Texas. I will report more on this when the project is completed.
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