But how do you figure out if this invasive pest is in your facility in the first place? And, if so, what’s the best way to monitor their populations?
After working with this pest for the last 1-2 years, researchers like myself have figured out which monitoring methods are most effective. This can help you identify the problem early, begin a management plan, and monitor the efficacy of your controls.
Join us for a GrowON webinar tomorrow (Tuesday May 30th) on potential solutions for Thrips parvisipinus from “boots on the ground” folks. This includes technical reps, industry consultants, and extension specialists.
Webinars on Thrips parvispinus are coming fast and hard lately, as scientists and extension agents try to get you the very latest information on this serious pest of ornamentals and peppers.
Join us for a GrowON webinar next Tuesday on potential solutions for this pest from “boots on the ground” folks. This includes technical reps, industry consultants, an your friendly neighborhood extension specialist in Ontario.
Sorry for the short notice folks, but even sometimes I’m out of the loop! There are two upcoming webinars on Thrips parvispinus, the new invasive thrips that is a serious pest of tropical ornamentals and pepper crops.
The first is by the University of Florida Extension folks, and should be a great update on what’s happening at the source. That webinar is TOMORROW (May 4) at 10am-12pm ET, so hopefully you see this in time! Hopefully it will be recorded for those that miss it.
The next webinar is on May 10th, and is being put on jointly by the Horticultural Research Institute, AmericanHort, the Canadian Nursery & Landscape Association, and American Floral Endowment.
For more details on these webinars and how to register, keep reading.
As Ontario sources much of its plant material from Florida, it’s a good idea to exercise caution, even on non-tropical plants. The known host range of this pest is evolving, and thrips have the potential to hitch-hike on less-preferred plant hosts and spread to more preferred hosts in your greenhouse.
Read on for information on the situation in Florida and what you can do to help protect your greenhouse from this pest.
The recent boom in tropical plant production over the past few years means growers are encountering different and more challenging pests in greenhouses. Please join me and Judy Colley (Biological Technical Rep for Plant Products) for an upcoming webinar with Michigan State University Extension, where we talk about how to manage the “usual suspects” on various tropicals, as well as some of the more unique problems!
Keep reading for more information on registration.
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 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.
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 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.
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 Swackhamer, 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) RichardGardner, 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.
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 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.
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.