Spotted Lanternfly – Getting Too Close for Comfort!

SpottedLanternFly
Photo from the Pennsylvania State Department of Agriculture and Markets.

Lately, you might have heard a lot about a certain invasive pest in the news – the Spotted Lanternfly. This objectively beautiful but damaging species is a pest of certain trees, grape vines, and other horticultural crops.

Spotted in North America as early as 2012, specimens of the invasive spotted lanternfly have now been detected in Michigan, New York and Quebec. Do Ontario ornamental crop growers need to be worried? Keep reading to find out!*

(*This post was was originally posted on the ONFruit blog and was amended by S. Jandricic for relevance to the ornamental industry).

What is a Spotted Lanternfly?

Spotted lanternfly fourth (final) instar nymph (immature). Note the color change to red and black with white spots. Photo courtesy of Gregory Hoover.
Spotted Lanternfly nymph (immature stage).

Spotted Lanternfly (Lycorma delicatula) is an invasive plant hopper, originally from Asia. They feed on the sap of plants. As with any sap-sucking pest (like aphids and whitefly), their feeding can causing wilting and dieback of plants when present in high numbers. Like aphids and whitefly, they also produce copious amounts of honeydew, resulting in the growth of sooty molds.

Crops at Risk

There are over 70 documented hosts in North America. The main hosts include grapevines, fruit trees (apple, peach, plum, cherry), hops and hardwoods (black walnut, maple).

However, certain ornamental tree and vine species can also be hosts, including Japanese maple, lilac, and virginia creeper. The biggest red flag for the ornamental industry on this list of susceptible host plants is certainly roses, including Beach and Japanese rose shrubs. Thankfully, other common ornamentals grown by the greenhouse floriculture industry (including perennials and outdoor cut flowers), do not appear to be hosts.

Spotted lanternfly swarm on grapevine
Swarm of spotted lanternfly on grapevines. (Credit: Erica Smyers, Penn State University).

Reports of economic injury in Pennsylvania, where this pest has established, have occurred in commercial vineyards, where swarm feeding has resulted in yield loss, decreased sugar content in harvested grapes, and weakening and death of vines. For trees, heavy feeding from spotted lanternfly feeding doesn’t usually kill the tree but is a stressor and some dieback can occur.

Early Detection is Critical

With ornamental trees and shrubs, as well as roses, on it’s list of potential targets, it essential that ALL agricultural operations keep their eye out for this pest, ESPECIALLY when receiving shipments from areas where Spotted Lanternfly has been spotted or is established (see Distribution, below).

Although established populations have NOT been found in Canada (yet), it’s moving closer and closer to our Ontario border with recent detections in New York and Michigan.

Early detection of any spotted lanternfly sightings is CRUCIAL so we can act quickly and limit its spread. Report any suspected finds immediately to the Canadian Food Inspection Agency (CFIA) online or by calling 1-800-442-2342.

Distribution

Native to Asia, spotted lanternfly was identified in Pennsylvania in 2014. Despite containment efforts, this pest has spread further and established populations are now found in various regions across the United States.

Map of spotted lanternfly reports in northeastern regions of United States show infestation present in Ohio, Pennsylvania, Maryland, West Virginia, Virginia, New Jersery and Connecticut. Individual finds also reported in New York, Maine and North Carolina.
Map of spotted lanternfly reports in the northeastern regions of the United States, as of October 29, 2020. (Source: New York State Integrated Pest Management, Cornell University).

In September 2020, the CFIA confirmed the identification of two dead spotted lanternflies on commercial trucks travelling from Pennsylvania to Quebec, illustrating the pests’ capacity for being spread quickly over large geographic areas by human activities.

Be Prepared

The spotted lanternfly is an excellent hitchhiker. Adults can cling to cars and trucks moving at high speeds for long distances. Females indiscriminately lay eggs on any smooth surface (vehicles, stones, lawn furniture, etc.); egg masses are difficult to detect, can be moved over great distances, and represent the life stage adapted to overwintering. 

Sticky tree band is wrapped around large tree trunk at eye level of adult.
OMAFRA staff putting up a sticky tree band to monitor for spotted lanternfly in 2018.

With so many different pathways and potential points of entry, monitoring presents a big challenge. In 2016 and 2018, OMAFRA monitored high risk areas using sticky tree bands. No spotted lanternfly was detected, but it was like looking for a needle in a haystack. Ontario is a big province!  

In 2019, a Canadian Spotted Lanternfly Education and Outreach Committee was formed. Members include the Invasive Species Centre, CFIA, OMAFRA, Ontario Federation of Anglers and Hunters, industry representatives and city foresters.

Currently, the best plan of attack for Ontario is to have as many trained eyes as possible on the look-out for this unique-looking invasive insect.

Know What to Look For

In the mid-Atlantic states, overwintering egg masses are laid through the fall. The egg masses usually have about 30 to 50 eggs and are laid in parallel lines.

Spotted lanternfly egg masses: (a) Fresh egg masses have a waxy coating. (b) In older egg masses, the waxy coating starts to crack. (c) Eventually, the waxy coating begins to come off. In this picture, some eggs have hatched.
(Credits: (a) Pennsylvania Department of Agriculture, Bugwood.org), (b) & (c) Emelie Swackhamer, Penn State University, Bugwood.org)

Nymphs begin to appear in the late spring.  They feed and move almost constantly. Keep a close eye on grapes, tree-of-heaven, black walnut, butternut, willow, birch, sumac and roses around your property as nymphs seem to prefer these hosts. Late instar nymphs tend to cluster together on preferred hosts, such as tree-of-heaven and black walnut.

Spotted lanternfly nymphs: (a) Early instar nymphs are black with white spots. (b) Late instar nymphs are red and black with white spots.
(Credits: (a) Emelie Swack
hamer, Penn State University, Bugwood.org, (b) Richard Gardner, Bugwood.org)

Adults appear mid-July and are active until they are killed by cold temperatures.  In vineyards, adults tend to show up along borders first. There are reports that spotted lanternfly adults are poor flyers; however, they can travel a long distance with the right conditions.

Spotted lanternfly adult: (a) Front wings are pale with black spots at the front and dark net-like bands at the tips. (b) Rear wings have bands of red, black and white. (Credits: (a) Emelie Swackhamer, Penn State University, Bugwood.org, (b) Richard Gardner, Bugwood.org)

There is one generation of spotted lanternfly per year. Recent observations show that spotted lanternfly does not require tree-of-heaven to survive, but comprehensive information on host use requires additional research.

Life cycle of spotted lanternfly: egg masses are present September until the following May, early nymph activity begins April until July, late nymph activity begins July until September, adult activity begins July until October.
Lifecycle of spotted lanternfly. Timing of each life stage is based on information from Pennsylvania, US.
(Credit: Lawrence Barringer, Pennsylvania Department of Agriculture)

Management in the United States

In the US, research is being conducted to develop better tools for monitoring and management. You will find the latest information on Penn State Extension’s spotted lanternfly website.

Current management in the US includes:

  • Remove and destroy egg masses –Scrape off into a container and place in alcohol (hand sanitizer, rubbing alcohol, other). Check vehicles, farm equipment and other hard surfaced items thoroughly for egg masses if coming from infested areas.
  • Remove tree-of heaven – May help reduce numbers but may not be practical if present in large numbers. Herbicides can be applied to control suckers. Since other hosts may prove suitable to complete development, attempts at eradicating tree-of-heaven as a management strategy may prove ineffective. 
  • Use sticky tree bands – Helps reduce numbers of nymphs. To avoid catching non-target organisms, use large-gauge mesh over the band, or alternatively, inward-facing sticky bands to intercept nymphs as they climb up host trees. Research to develop better traps is ongoing.
  • Encourage natural enemies – This includes spiders, assassin bugs, praying mantis and others that prey on spotted lanternfly. Relying on natural enemies alone may not be enough to control a high population. Parasitic wasps have been identified in China but require evaluation for non-target effects. 
  • Use insect-pathogenic fungi – Fungal pathogens, such as Beauveria bassiana, are being evaluated. The entomopathogenic fungus Baktoa major has been found in association with SLF in Pennsylvania and appears to be highly virulent against the pest.
  • Apply insecticides – Products containing bifenthrin, thiamethoxam, dinotefuran, carbaryl, fenpropathrin, malathion or zeta-cypermethrin provide effective control of nymphs and adults. Chlorpyrifos is the only active ingredient that gave high mortality of eggs. Mineral oil has shown egg mortality of up to 71%. For landscape trees, they have used tree injections, trunk sprays or soil drenches with certain neonicotinoid insecticides with excellent results. 

Where We Go From Here

Although Spotted Lanterfly hasn’t shown up in Ontario yet, OMAFRA is already taking steps besides monitoring. As we do not have any registered uses for the control of spotted lanternfly in Canada, this pest has been prioritized through the Minor Use Program for high-risk crops.

Although this pest may seem concerning to many – remember – we’ve been through this before (I’m looking at YOU, Japanese beetle!). As with JB, different agencies within Canada will work together with growers and industry groups to develop action plans to both protect Canadian crops and maintain market access, should this pest make it to Ontario.

Japanese Beetles are in Flight! How to control JB under the new GCP regulations.

JB Pesticide timing InfographicJapanese Beetle (Popillia japonica) adults are starting to take flight in southern Ontario.   They have been spotted in Hamilton and Niagara this week. Read on for an updated post on WHAT and WHEN to spray for JB to meet certification requirements if you ship product outside Ontario.

Continue reading “Japanese Beetles are in Flight! How to control JB under the new GCP regulations.”

Lassoing Loopers: why you NEED to care about caterpillar control

tomato looper 2_Steve hatch

Know which looper species this is? Are you SURE? If not, keep reading, as some species could get your shipments detained at the border.  Photo: Steve Hatch, Bugwood.org.

With spring crops behind us and summer approaching, most of you are probably concentrating on the Big 3: thrips, aphids and whitefly.  But recent alerts put out by the United States Department of Agriculture (USDA), bring a new emphasis to caterpillar control.  Read on to understand what’s happening, how to control occasional pests like cabbage looper, and avoid potential issues at the border.

 

Continue reading “Lassoing Loopers: why you NEED to care about caterpillar control”