4 Beneficial Insects And Fungi You Need To Know For Greenhouse Whitefly Control

Whitefly is a perennial problem in greenhouses everywhere, but biological control is an increasingly popular tool for greenhouse growers to manage these pests.

Here are some of the most commonly used beneficials for this pest, as well as handling, application and management suggestions to help you maximize the effectiveness of each.

Encarsia formosa
Encarsia formosa. Photo courtesy of John Sanderson.

Whitefly Beneficials

Encarsia formosa
Pests Attacked: Whiteflies. Encarsia formosa is most effective against greenhouse whitefly. It attacks whitefly nymphs, not adults nor eggs. E. formosa is the best beneficial to use against the greenhouse whitefly.
Identification: This is a tiny wasp (they grow up inside a whitefly nymph) It has a black head and thorax and yellow abdomen. Parasitized whitefly pupae turn from white to black.
Biology: E. formosa has similar parasitoid biology to A. colemani, except Encarsia does not attack aphids.
How to check for shipment viability: Encarsia is shipped as parasitized whitefly pupae glued to small cards. Place a few cards individually into clear jars and hold them in the shade at room temperature until many tiny wasps are seen walking around inside the jar. A sticky trap can be placed inside the jar and inspected for wasps.
How to release into crop: Hang the Encarsia cards within the foliage, shaded, to allow wasps to emerge from the cards and fly in the plant canopy to search for whitefly nymphs.

Eretmocerus eremicus adult
Eretmocerus eremicus adult. Photo courtesy of Mark Hoddle and John Sanderson.

Eretmocerus eremicus
Pests attacked: Whiteflies. It will attack nymphs of both greenhouse whitefly and sweetpotato whitefly. E. eremicus is more effective against sweet potato whitefly than is E. formosa.
Identification: Female E. eremicus are yellow and the males are
darker yellow.
Biology: E. eremicus is somewhat similar to E. formosa. E. eremicus remains effective at warmer temperatures (above 86°F) than E. formosa.
Checking for shipment viability and release methods: These are the same as for E. formosa. Some companies sell a mixture of E. formosa and E. eremicus.

Delphastus catalinae
Pests Attacked: Delphastus is a tiny ladybeetle that attacks whitefly eggs and nymphs.
Identification: The beetles are shiny black and females have a reddish-brown head. Larvae are greyish with a somewhat fuzzy appearance.
Biology: Both larvae and adults are voracious predators of whitefly eggs and nymphs. Females lay eggs in whitefly patches; the hatching larvae begin eating. Females cannot produce eggs unless they can consume at least 200 whitefly eggs per day. Thus, Delphastus works best in whitefly hotspots. The beetles will avoid eating whitefly nymphs that are parasitized by older-stage Encarsia or Eretmocerus.
How to check for shipment viability: Delphastus is shipped in bottles or vials containing adult beetles mixed in buckwheat hulls or other carrier. Active beetles will be obvious in a viable shipment.
How to release into crop: Delphastus should be used in combination with Encarsia or Eretmocerus, and the beetles should be released into whitefly hotspots.

Fungal Pathogens
(BotaniGard, Preferal, Met52)
Pests Attacked: These fungal pathogens may be effective against whiteflies.
How to release into crop: They are applied as a foliar spray and good coverage of the undersurfaces of leaves is important because the immobile nymphal stages of the whiteflies is the target. Several applications will be needed for good control. Humidity should be above 80 percent for germination of the fungal spores that will then penetrate the whitefly skin and cause infections and death. Do not use fungicides for several days before or after an application. See product labels for more information.

Biocontrols-web-graphic-34_1

Topics: ,

Leave a Reply

More From Crop Inputs...
foxglove-aphid

November 29, 2016

How Greenhouse Growers Can Manage The Foxglove Aphid

Recent research is shedding new light on the foxglove aphid. Understanding host plants, identification, and biology will help growers deal with this pest.

Read More
growth-products-catalog

November 19, 2016

Growth Products Launches New Catalog Of Horticulture Biological Products

The full-color resource guide provides detailed product descriptions and rate charts for all of the company’s bioinnovations, liquid fertilizers, micronutrients, and biological control products.

Read More

November 1, 2016

Bayer Production Ornamentals Hits The Market With 17 Products And More Coming

November 1 officially marked the launch of the Bayer Production Ornamentals business, serving professional growers in greenhouses and nurseries across the U.S. Its comprehensive portfolio of innovative product solutions and support includes product and pest management expertise and a team of technical specialists.

Read More
Latest Stories
foxglove-aphid

November 29, 2016

How Greenhouse Growers Can Manage The Foxglove Aphid

Recent research is shedding new light on the foxglove aphid. Understanding host plants, identification, and biology will help growers deal with this pest.

Read More
growth-products-catalog

November 19, 2016

Growth Products Launches New Catalog Of Horticulture Bi…

The full-color resource guide provides detailed product descriptions and rate charts for all of the company’s bioinnovations, liquid fertilizers, micronutrients, and biological control products.

Read More

November 1, 2016

Bayer Production Ornamentals Hits The Market With 17 Pr…

November 1 officially marked the launch of the Bayer Production Ornamentals business, serving professional growers in greenhouses and nurseries across the U.S. Its comprehensive portfolio of innovative product solutions and support includes product and pest management expertise and a team of technical specialists.

Read More

October 25, 2016

Why Logic May Be The Best Defense Against Q-Biotype Whi…

Greenhouse Grower Editor Laura Drotleff says while you may feel you're in a lose-lose situation with pest control, there are some solutions that can help.

Read More
eric smith Biosafe

October 13, 2016

BioSafe’s New Hort Sales Rep Says Water Regulation And …

Eric Smith, BioSafe Systems’ New Horticultural Technical Sales Representative, has several years of experience that he says will help him when working with growers on critical issues facing them.

Read More
weeds

October 8, 2016

Sign Up For The University Of Florida’s Weed Management…

Participants in the course, which starts October 24, will learn how to manage all aspects of weed management in greenhouses, including weed identification, developing herbicide programs, and the latest non-chemical methods of weed control.

Read More
Downy mildew lesions on light coleus cultivars feature

October 4, 2016

Crop Protection Manufacturers Detail 2017 Early Order D…

Greenhouse Grower asked crop protection product manufacturers to send us the details for their 2017 Early Order Discount Programs and ongoing rebate programs, to provide you with a compiled knowledge resource of all discount offers at a time when you're making decisions for 2017.

Read More
tomato spotted wilt virus angular-necrosis-of-leaves-and-plant-stunting

September 28, 2016

Tips For Managing Tomato Spotted Wilt Virus In Mums

According to a report from Michigan State University, symptoms of tomato spotted wilt virus on chrysanthemum include yellow blotching and rings, necrotic lesions, and stem collapse.

Read More
cannabis-crop-protection

September 27, 2016

Washington State Outlines Pesticide Criteria For Cannab…

The state has also compiled a searchable list of pesticides that fit the criteria for use on marijuana.

Read More
Orius_June 2015

September 25, 2016

Peace Tree Farm Hosting Biocontrols Event In October

“Advanced Greenhouse Biocontrols for Ornamental and Vegetable Producers” will feature advice from biocontrol authorities Lloyd Traven and Suzanne Wainwright-Evans.

Read More
steve-larson-bayer

September 23, 2016

Bayer Continues Its Shift Into The Ornamentals Market

The company has announced its 12 distributor partners, and also recently named Steve Larson — formerly with Color Spot Nurseries — as its ornamental specialist.

Read More
Biocontrols and beneficials absolutely can be used in outdoor production, with the use of banker plant systems

September 19, 2016

Learn About Biological Controls In The Greenhouse In A …

Michigan State University Extension (MSU) and Kansas State University Research and Extension are collaborating on a pre-recorded online course on “Biological Control for Greenhouse Growers.”

Read More
Bees And Pesticides

August 23, 2016

Studies Offer Conflicting Views On Neonic Effect On Bee…

How much exposure to neonicotinoids do bees need before their health becomes affected? That’s the question two research teams look to answer.

Read More
Chrysanthemum Aphid

August 22, 2016

How To ID And Manage Black Aphids In Chrysanthemums

Growers in Michigan have recently been reporting a higher presence of this pest. Here are some tips on how to control it.

Read More
Cannabis Crop Protection

August 22, 2016

Cannabis Group Stays Focused On Consistent Standards Fo…

The Foundation of Cannabis Unified Standards (FOCUS), is an independent, third-party, not-for-profit organization, is in the process of developing cannabis-specific standards for everything from cultivation and extraction to packaging and retail.

Read More
Leaf Septoria In Cannabis

August 21, 2016

Three Diseases To Watch For In Cannabis Production

The development of root rot, powdery mildew, and leaf septoria can damage cannabis to the point of complete crop loss.

Read More
Greenhouse Whitefly

August 18, 2016

Vestaron Planning For More Research And Development Of …

On the heels of launching Spear-T, its first bioinsecticide, Vestaron has received additional financing that will be used to develop new products with new modes of action.

Read More
BioWorks Mycotrol

August 17, 2016

New Organic Mycoinsecticide From BioWorks Now Registere…

BioWorks’ Mycotrol can be used to manage whitefly, thrips, aphids, and other insects in greenhouses and nurseries.

Read More
[gravityform id="35" title="false" description="false"]