Pest Of The Month: Whitefly

Pest Of The Month: Whitefly

The sweet potato whitefly, B biotype, also known as the silver-leaf whitefly, may be a tiny insect with a yellow body and white wings, but it sure can pack a punch to a variety of vegetable crops. Making matters worse, it has the ability to transmit viruses.

According to John Palumbo, a professor and Extension specialist at the University of Arizona, in the Southwest and California, melons are its preferred host followed closely by Brassica crops. To a lesser extent, leafy vegetables also can become a target of the whitefly. Melons, in particular, have been impacted by adult populations because adults have the ability to vector Cucurbit Yellows Stunting Disorder Virus (CYSDV). Infected plants typically show yellowing and leaves roll upward, which can lead to economic loss. Whiteflies also vector geminivirus that can cause severe reduction in yields.

Life Cycle Of The Pest

Adults are usually present in fields soon after plants emerge, says Palumbo. Eggs are laid on the undersides of young leaves almost immediately, and nymphs hatch in three to four days. When a grower sees masses of adults on the undersides of terminal leaves, this is the first sign that he has a big problem, he adds.

“This would soon be followed by the presence of nymphs, and much later the presence of honeydew,” explains Palumbo. “At that point, you’re generally too late to prevent economic damage.”

Honeydew, the substance excreted by nymphs after they have removed plant juices, accumulates on the crops and serves as a medium for the growth of a black, sooty mold. “The honeydew and sooty mold contaminate the marketable portion of vegetable crops and essentially render them unmarketable,” says Palumbo.

Management And Control Strategies

Control as early in the season as possible is critical. With the increased insensitivity to products such as imidacloprid, Palumbo encourages growers to include cultural practices into their management programs that will reduce the numbers of whiteflies in their area.

“This would include careful attention to proper crop management and scheduling, and most importantly, sanitation practices including the timely destruction of harvested plant residue,” he says.

In addition, several products are available to growers that provide control of whiteflies. Palumbo says alternative neonicotinoids provide efficacy of both adults and nymphs either via systemic soil applications with products such as Venom (dinotefuran, Valent U.S.A. Corp.) Scorpion (dinotefuran, Gowan Co.), or Platinum (thiamethoxam, Syngenta Crop Protection); or through foliar application with translaminar activity with Venom, Assail (acetamiprid, United Phosphorus, Inc.), Scorpion, or Actara (thiamethoxam, Syngenta Crop Protection).

“When applied prior to plant emergence, either through drip chemigation, or as a soil, shank injection at planting, a systemic neonicotinoid insecticide is quickly taken up by the plant and distributed via the vascular tissue to the newly emerging plant growth,” he says. “As adults feed on this plant tissue, they are quickly killed before they are able to lay a large number of eggs.”

Management with a soil systemic insecticide also helps with controlling the vector of viruses such as CYSDV, explains Palumbo. This management strategy has been shown to reduce primary virus infection, and can suppress the subsequent spread of virus throughout the field.

Leave a Reply

Featured Stories
Scarlet Crush™
Our new Honeycrisp/Pink Lady® cross is sweet with citrusy notes, plus all that famous Honeycrisp snap and juiciness. Up to to 3” pink/rosy-red fruit is uniform, conical and very attractive. A fine cooking and fresh-eating apple. Keeps up to 6 months. Ripens as early as late September. USPPAF. Best pollinators: Starkspur® Red Rome Beauty, Stark® Jon-A-Red® Jonathan or any Golden Delicious. Zones: 3-6.
Fruits
December 8, 2016
Stark Bro’s Nurseries & Orchards Co. 2017 Variety Showcase [Slideshow]
For more information on these varieties, contact Stark Bro’s Nurseries & Orchards. Stark Bro’s Nurseries & Orchards P.O. Box 398 Read More
Past industry efforts to discover Paradox hybrid seedlings (Juglans hindsii x J. regia) with superior traits have led to advanced selections of Paradox clones, each with unique characteristics. The University of California selection, RX 1, is a top-choice for Sacramento Valley walnut orchardists and others looking for resistance to Phytopthora and good survivability. RX 1 is a cross of Juglans microcarpa x J. regia. It is showing to be one of the most adaptable walnut rootstocks, producing a large tree with the highest yields in replicated trials. USPP#20,649 P3
Fruits
December 7, 2016
Sierra Gold Nursery 2017 Variety Showcase [Slideshow]
Sierra Gold Nurseries in Yuba City, CA, offers two walnut rootstocks, a salt-tolerant pistachio rootstock, and more. Read More
Action shot of an automated strawberry picker from Harvest CROO
Equipment
December 6, 2016
USDA Announces $3 Million For Robotic Agriculture Research
More evidence being found about how people can benefit from automation in the field. Read More
billevans
Apple Grower of the Year
December 6, 2016
2014 Apple Grower Of The Year Bill Evans Dies
Legendary apple grower Bill Evans, who along with his wife, Jeannette, farmed more apple acreage than any grower in the Read More
weedy watermelon field
Crop Protection
December 6, 2016
New Fact Sheet Analyzes Weed Seeds And Their Longevity
Topics covered include how weed seeds travel, when they germinate, and ways they can be eliminated. Read More
Field trials are one component being used to evaluate water and nitrogen use efficiency in lettuce.  A wide array of germplasm is being screened including cultivars of leaf, romaine, iceberg and butter types, mapping populations and non-domesticated primitive types and wild lettuce species.   Photo credit: David Still
Crop Protection
December 6, 2016
Scientists Aim To Improve Nitrogen, Water Use Efficiency In Lettuce
Genetic research intends to develop varieties with enhanced nutrient uptake. Read More
Cannabis plant closeup
Citrus
December 6, 2016
Report: Florida Cannabis Business To Approach $2 Billion By 2020
Lofty projections include a compound annual growth rate of 140%. Read More
Growers participate in a real-time industry survey session at the 2016 Florida Citrus Show
Citrus
December 6, 2016
Florida Citrus Community Tasked To Unify For Stronger Future
A group effort is necessary to forge ahead. Read More
field shot the Produce Peddler Colorado
Crop Protection
December 6, 2016
Orondis Opti Fungicide Receives Registration In Premix Formulation
The product provides control of Oomycete diseases in vegetables and other specialty crops. Read More
BlackPearl® is the best early season cherry, ripening 10 days before Bing and around Chelan. It has exceptional flavor and is extremely firm and crunchy. BlackPearl® is medium size with 20% sugar and keeps better that most other cherries. The tree is hardy and canker resistant. Early season bloom, S4 unknown.
Fruits
December 6, 2016
Fowler Nurseries, Inc. 2017 Variety Showcase [Slideshow]
For more information on these varieties, contact Fowler Nurseries, Inc. Fowler Nurseries, Inc. 525 Fowler Rd. Newcastle, CA 9565827 Phone: Read More
The Latest
Fruits
December 8, 2016
Stark Bro’s Nurseries & Orchards Co.…
For more information on these varieties, contact Stark Bro’s Nurseries & Orchards. Stark Bro’s Nurseries & Orchards P.O. Box 398 Read More
Fruits
December 7, 2016
Sierra Gold Nursery 2017 Variety Showcas…
Sierra Gold Nurseries in Yuba City, CA, offers two walnut rootstocks, a salt-tolerant pistachio rootstock, and more. Read More
Equipment
December 6, 2016
USDA Announces $3 Million For Robotic Ag…
More evidence being found about how people can benefit from automation in the field. Read More
Apple Grower of the Year
December 6, 2016
2014 Apple Grower Of The Year Bill Evans…
Legendary apple grower Bill Evans, who along with his wife, Jeannette, farmed more apple acreage than any grower in the Read More
Crop Protection
December 6, 2016
New Fact Sheet Analyzes Weed Seeds And T…
Topics covered include how weed seeds travel, when they germinate, and ways they can be eliminated. Read More
Crop Protection
December 6, 2016
Scientists Aim To Improve Nitrogen, Wate…
Genetic research intends to develop varieties with enhanced nutrient uptake. Read More
Citrus
December 6, 2016
Report: Florida Cannabis Business To App…
Lofty projections include a compound annual growth rate of 140%. Read More
Citrus
December 6, 2016
Florida Citrus Community Tasked To Unify…
A group effort is necessary to forge ahead. Read More
Crop Protection
December 6, 2016
Orondis Opti Fungicide Receives Registra…
The product provides control of Oomycete diseases in vegetables and other specialty crops. Read More
Fruits
December 6, 2016
Fowler Nurseries, Inc. 2017 Variety Show…
For more information on these varieties, contact Fowler Nurseries, Inc. Fowler Nurseries, Inc. 525 Fowler Rd. Newcastle, CA 9565827 Phone: Read More
Vegetables
December 6, 2016
Rupp Seeds 2016 Vegetable Variety Showca…
For more information, contact, Rupp Seeds: 17919 County Rd. B, Wauseon, OH 43567 800-700-1199; WEBSITE www.RuppSeeds.com FAX 419-337-5491; EMAIL [email protected] Read More
Farm Marketing
December 6, 2016
Registration Is Open For 32nd Annual Nor…
The six-day event for agritourism operators heads to the Northeast with highlights including bus tours, educational sessions and workshops, and business exchange. Read More
Insect & Disease Update
December 5, 2016
Best Practices For Bactericides Key To V…
Approval finally cleared for antimicrobial applications, and now growers wait and hope to see positive results. Read More
Citrus
December 5, 2016
South Florida Endures Driest November On…
Region has not experienced any significant rainfall since Hurricane Matthew. Read More
Fruits
December 5, 2016
Fall Creek Nursery 2017 Variety Showcase…
For information about these varieties, contact Fall Creek Nursery: Fall Creek Nursery 39318 Jasper Lowell Road Lowell, OR 97452 800-538-30015 [email protected] Read More
Fruits
December 5, 2016
Team Coverage: Fruit And Nut Industry Co…
Can’t make it to the biggest fruit and vegetable conferences? No sweat, we’ll take you there. Read More
Vegetables
December 4, 2016
Rispens Seeds 2016 Vegetable Variety Sho…
For more information, contact Rispens Seeds: 1357 Dutch American Way, P.O. Box 310, Beecher, IL 60401 708-946-6560; WEBSITE RispensSeeds.com FAX Read More
GenNext Growers
December 4, 2016
New Loans Available For Small, Beginning…
USDA recently announced streamlined guaranteed Loans and additional lender category for small-scale operators. Read More