Tips For Successful Late-Season Whitefly Control

If you’re a football fan, you understand that no coach heads into the fourth quarter without a plan. Late-season whitefly control in poinsettias requires the same type of proactive planning: Be ready to deploy your best players in a manner that will provide the greatest benefit. Factors affecting player choice for late-season whitefly control include bract safety, pest pressure, and previous product use. Rotation is critical to avoid development of resistance.

Plan Ahead

Hopefully, a successful whitefly control plan was implemented early in the crop, whether it’s chemical-based or a plan based on biological controls (BCAs). Either way, if whiteflies were well-controlled early, late-season outbreaks are greatly reduced and much easier to manage. Ensuring this success requires diligent scouting and a quick response to increasing pest pressure.

Growers using BCAs should continue to release wasps through shipping to maintain control. Eretmocerus eremicus provides more aggressive and complete control of whitefly species than does Encarsia formosa, but Encarsia can work well if the only whitefly species present is correctly identified as Trialeurodes, the greenhouse whitefly.

For growers relying on chemical control of late-season whiteflies, the first step in planning is to consider bract safety. When applied properly, the following products will not harm bracts: Flagship, Judo, Kontos, Rycar, Safari, Sanmite, and TriStar.

Spray Rotation Choices For Whitefly Control ChartKnow Your Pest

Next, consider the pest. Bemesia whitefly occurs as two biotypes, B and Q, which are indistinguishable by physical appearance. The Q-biotype is known to be resistant to some important whitefly products. If you experienced failures in control earlier in the season when using Distance, Fulcrum, Talus, or Sanmite, you have higher odds of having Q-biotype whiteflies present late. If this is the case, avoid the use of Sanmite for late-season control.

Rotate Your Chemicals

Finally, plan your application to provide rotation across modes of action (MOAs). Remember that a spray application following an early- or late-season drench must provide a rotation away from the drench MOA to ensure control. Chart 1 outlines outlines sound rotational choices. As you progress to the right in the chart, choose from one product in a subgroup if more than one option is listed.

One last thought about late-season control of whiteflies in poinsettias: The tight canopy makes control difficult. If possible, plan a drench of an upwardly systemic product to cover the later part of the season. Also, consider applying chemicals via a fogger for better contact, and look to translaminar products to help improve pest exposure.

Topics: , , ,

Leave a Reply

More From Crop Inputs...
Oasis-Root-Cubes-Retail-Pack

May 20, 2018

Smithers-Oasis Now Offering Rootcubes Foam Media in Retail Pack

Designed with smaller or hobby growers in mind, the Rootcubes packs are also ideal for larger growers to use for trials.

Read More
Botrytis-Symptoms-feature

May 12, 2018

Fungicide Resistance in Botrytis is an International Challenge

Clemson University’s research team is exploring Botrytis in cut roses to find out how to help you maintain postharvest crop quality by avoiding fungicide resistance.

Read More
algae-on-greenhouse-benches-feature

May 9, 2018

How Greenhouse Sanitation Helps You Start Clean and Stay Clean

If you keep your greenhouse clean from the start, you’ll save yourself money in the end.

Read More
Latest Stories
lucas-greenhouses-plant-roots-growing-mix

March 18, 2018

New Soil Amendment From Kemin Promotes More Efficient N…

Valena, a soil amendment sourced from a proprietary strain of Euglena gracilis (algae) rich in beta-glucan, is designed to support the growth of healthy and strong plants.

Read More

March 13, 2018

Greenhouse Biocontrol Goes Mainstream

Biological control has moved into the mainstream for greenhouse growers. And the timing couldn’t be better, as consumer demands for more sustainable production methods for the plants they buy are moving back upstream.

Read More
Jose-Milan-Bayer

February 11, 2018

Bayer Has New Turf and Ornamentals Global Market Manage…

Jose Milan will be focused on helping growers deal with regulatory issues, while promoting the environmental benefits the ornamentals industry offers.

Read More
Belchim Crop Protection

January 24, 2018

Engage Agro Now Doing Business as Belchim Crop Protecti…

For more than 30 years, Belchim has been providing agricultural customers internationally, including greenhouse growers, with more than 100 well-known products.

Read More
cuttings-facility

December 13, 2017

New Webinars Address Effective Propagation Techniques

e-Gro, an online clearing house for alerts about greenhouse disease, insect, environmental, physiological, and nutritional disorders, recently posted two new propagation-related webinars on YouTube.

Read More

December 4, 2017

Raker-Roberta’s Young Plants Debuts as Roberta’s Finali…

On December 1, Eric Wallien of Roberta’s Inc. in Waldron, IN, officially purchased C. Raker & Sons in Litchfield, MI. The new identity of the company is now Raker-Roberta’s Young Plants, according to a Dec. 1 letter to Raker’s customers, suppliers, and business partners from Vice President Susie Raker-Zimmerman. “There have been minimal changes in management and we will be providing the same products and services on which we have built our reputation in the industry,” Raker-Zimmerman said in the letter, which also announced the name change and new logo. The sale of C. Raker & Sons was announced in September . A series of events affecting Raker’s financial situation caused the need for the operation to find an alternate solution. Roberta’s had been a customer of Raker’s since 2011, and the fourth generation, family owned grower-retailer was a fan of Raker’s commitment to quality. The agreement to purchase C. […]

Read More
Biocontrols in a Greenhouse

November 27, 2017

4 Opportunities to Educate Yourself on IPM Practices in…

The Michigan State University Extension floriculture team has developed four greenhouse integrated pest management sessions that will be presented at the 2017 Michigan Greenhouse Growers Expo in Grand Rapids, MI.

Read More
Parasitized aphid mummies, ladybird beetle larvae

November 11, 2017

OHP Announces Two New Ornamental Pest Management Tools

OHP recently added two new crop protection tools to its profile of biosolutions: a biological insecticide, and an ornamental fungicide.

Read More
OHP Biosolutions

September 26, 2017

OHP Acquired by AMVAC, But Will Continue to Operate As …

AMVAC has acquired OHP and its chemical and biological crop protection solutions for the greenhouse and nursery markets. The deal will close in early October, and there will be no changes to staff, products, or operations.

Read More
Hydroponics Michigan State Web

September 14, 2017

Hydroponic and Aquaponics Growers Face Possible Loss of…

The National Organic Standards Board is considering recommending that USDA revoke the ability for hydroponic, aquaponic, aeroponic, and other container-based growing methods to be certified organic, according to an update from growers at Upstart University.

Read More
Aphids

July 7, 2017

New Tools for Your Crop Protection Arsenal in the Green…

Over the past few months, crop protection companies have developed several new products designed to help you manage a wide range of insect and disease pests. Here’s a look at some of them.

Read More
Yellow Stick Card for thrips

July 5, 2017

Tips From a Top 100 Grower for Effective Thrips Control

A combination of conventional materials and biologicals can help provide season-long management of thrips in hanging baskets.

Read More
Primula acaulis, Botrytis, Disease, Griffin Greenhouse Supplies

May 30, 2017

BioWorks Launches New Biofungicide for Botrytis Control

BotryStop was developed for the control of pathogens such as Botrytis, Sclerotinia, and Monilinia in several crops, including ornamentals.

Read More
Adult Aphidoletes in web - Feature

May 27, 2017

How to Overcome Biocontrol Challenges by Thinking Outsi…

With a little creative thinking and adjustments to your strategy, you can overcome your greenhouse biocontrol challenges.

Read More
Cannabis Seedling

May 20, 2017

Biocontrols: A Practical Option for Cannabis

With limited options for chemical pest control, cannabis growers are incorporating biocontrols into their integrated pest management programs. More education will cement this solution as a viable option in this emerging market.

Read More
Christmas Cactus

May 18, 2017

How to Increase Branching and Flower Bud Production of …

Based on research completed at North Carolina State University, here are some methods for increasing branching and flower bud production of Christmas Cactus (Schlumbergera bridgessii).

Read More
Herbicide Drift in the Greenhouse

May 15, 2017

How to Identify and Mitigate Herbicide Contamination in…

Herbicides applied off-site or within the greenhouse can significantly damage ornamental and edible crops. Beth Scheckelhoff, an Extension Educator for Greenhouse Systems at The Ohio State University, provides some examples and basic recommendations for mitigating and preventing herbicide contamination and injury in the future.

Read More

May 4, 2017

Bayer Altus Update: Neonic Insect Control Alternative N…

Altus, a butenolide class insecticide with the active ingredient flupyradifurone, will be available beginning May 1, and is labeled for greenhouse and nursery use on ornamental plants, vegetable transplants, and indoor vegetable production.

Read More