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What is VegEdge?
VegEdge is a University of Minnesota Extension website that provides integrated pest management (IPM) information for vegetable growers, processors, and crop consultants in the Midwestern U.S. Its content reflects more than 25 years of university research and is organized around seasonal decision-making rather than general gardening advice.
Its main tools are:
- Moth Flight Network – seasonal monitoring of European corn borer (ECB) and corn earworm (CEW) moth catches across Minnesota, with weekly updates.
- Degree-days for Pests – growing-degree-day calculations for key insect pests, updated through the growing season by state and region.
- Weekly Vegetable Update – field observations from IPM Extension Educators Natalie Hoidal and Marissa Schuh, published on the Fruit and Vegetable News site.
- News & Pest Alerts – short items on emerging issues, such as a Winsome Fly fact sheet, a Winsome Fly citizen science project, FSMA agricultural water updates, and bacterial disease in tomato transplants.
Who it is for: commercial vegetable operations, crop consultants, and processors who need to time scouting and control measures. It is less suited to home gardeners, and its pest activity and degree-day data are specific to Minnesota and the Upper Midwest, so growers elsewhere should treat it as a model rather than a local forecast.
A practical next step: if you grow vegetables in the region, check the current moth flight and degree-day pages before setting your scouting schedule, then read the latest Weekly Vegetable Update for what educators are seeing in fields. The site also points to related University of Minnesota resources such as FruitEdge for fruit crops.
How can I use the Moth Flight Network to time insecticide applications for European corn borer and corn earworm?
Use the Moth Flight Network as a regional early-warning system, not as a spray calendar. It tells you when European corn borer (ECB) and corn earworm (CEW) moths are flying in Minnesota, which is the first signal that egg-laying and larval activity are approaching. You combine that with degree-day accumulations and your own field scouting to decide whether and when to treat.
A practical workflow
- Watch the weekly moth flight updates. VegEdge monitors ECB and CEW moth catch across the state each year and posts activity on its Weekly Moth Flight page. Rising catches mean moths are present and mating; a sustained catch or a sharp increase is your cue to intensify scouting.
- Pair moth catch with degree-days. VegEdge calculates degree-days for key insect pests with state and region-wide updates through the growing season. Moth flight tells you adults are out; degree-days estimate when their offspring reach the damaging stage. Treating on flight alone risks spraying too early, before larvae are feeding where the insecticide can reach them.
- Scout your own fields. Moth traps are regional, not field-specific. Sampling is a core IPM practice because it lets you estimate the actual pest density in your crop. Check whorls, silks, and ear zones for eggs and small larvae before committing to a spray.
- Time the application to the vulnerable stage. For ECB, target larvae before they tunnel into stalks or ears, since once inside, contact insecticides are largely ineffective. For CEW, the critical window is silk-stage egg-laying and newly hatched larvae on the silks. Your local degree-day thresholds and scouting results should drive the exact date.
How the two pests differ
| European corn borer | Corn earworm | |
|---|---|---|
| What flight tells you | Moth emergence and generations | Migrant moths arriving and laying |
| Key treatment window | Before larvae tunnel into stalks/ears | Silking through early larval feeding on silks |
| Main risk of mistiming | Larvae protected inside plant tissue | Larvae move deep into the ear tip |
When to treat, when to hold
Treat when moth catch is rising or sustained, degree-days put your crop in the susceptible window, and scouting finds eggs or small larvae at economically meaningful levels. Hold off when traps are quiet, when degree-days indicate larvae are not yet active, or when scouting finds only large larvae already protected inside plant tissue.
A useful next step: bookmark the Weekly Moth Flight and Degree-Days pages on VegEdge and check them alongside the Weekly Vegetable Update, which reports what extension educators are seeing in area fields. If you grow tomatoes or cabbage, also review the disease and transplant guidance, since insect timing decisions interact with disease pressure and crop stage.
How do I interpret degree-day models for key vegetable insect pests to decide when to scout or treat?
VegEdge publishes degree-day calculations for key insect pests and updates them through the growing season, so the site is a practical starting point for timing scouting and treatment windows in Midwestern vegetable crops. The core idea is that insect development is driven by accumulated heat, not calendar dates, so a degree-day total tells you which life stage is likely present in your fields.
How to use the numbers
- Check the current degree-day accumulation for your region and pest species on the VegEdge degree-days page.
- Compare that total against the biofix-based thresholds for the pest you are managing (for example, the accumulation associated with egg hatch, larval activity, or peak flight).
- Use the Moth Flight Network updates, which track ECB and CEW catches statewide, to confirm whether field activity matches the model. Traps and models together are stronger than either alone.
- Scout when the model predicts the vulnerable stage is approaching, then treat only if scouting confirms the pest is present at damaging levels.
Practical decision points
- Biofix matters. Degree-day models start from a biological reference point, often first sustained moth catch or a set date. If your biofix is wrong, the whole accumulation shifts.
- Regional variation. Degree-days accumulate differently across Minnesota and the upper Midwest. Use the station or region closest to your fields rather than a statewide average.
- Scouting is the confirmation step. Degree-days tell you when to look; they do not tell you whether the pest is actually in your field at a treatable density.
- Treatment thresholds are separate. Even when the model predicts a stage, treatment depends on crop, market, and pest pressure. Consult your state extension thresholds for the specific crop.
Example scenario
A cabbage grower sees the degree-day model approaching the egg-hatch window for a lepidopteran pest complex. Rather than spraying immediately, the grower checks the Moth Flight updates for the region, then walks the field sampling plants. If larvae are below threshold, no treatment is needed; if they are at or above threshold, the timing is already aligned with the susceptible stage.
Next step
Bookmark the VegEdge degree-days and moth flight pages and check them weekly during the growing season, alongside VegEdge weekly vegetable updates. Pair the model output with your own scouting records so you build a field-specific history of when pressure actually arrives.
What IPM strategies does VegEdge recommend for managing bacterial diseases in tomato transplants?
VegEdge does not lay out a numbered bacterial-disease protocol on its homepage. What it does is point to an article on the University of Minnesota Fruit & Vegetable News site titled "Tomato Transplants & Bacterial Disease," which frames the problem: bacterial spot, bacterial speck and bacterial canker have become more common in Minnesota tomatoes, and control of all three begins during transplant production.
That framing is the strategy. Because the pathogens travel on seed and ride along in seedling trays and on hands, tools and foliage, the leverage point is the greenhouse, not the field. If you are raising your own transplants, the practical reading is to start with clean seed or treated seed, keep foliage dry by watering at the base and improving air movement, and rogue out any seedling showing spots or cankers before it reaches the field. If you buy transplants, inspect them on arrival and reject flats with symptomatic plants. Once bacteria are in a transplant house, chemical options are limited, so prevention and sanitation carry most of the weight.
VegEdge itself is best used as the ongoing-decision layer around that article. Its VegEdge Moth Flight Network tracks ECB and CEW catches statewide, the Degree-days for Pests section gives state and region-wide insect phenology updates through the season, and the Weekly Vegetable Update from IPM Extension Educators Natalie Hoidal and Marissa Schuh reports what is actually being seen in area fields. If you grow tomatoes in the Upper Midwest, the most useful next step is to read the transplant-disease article first, then check the weekly update and the Minnesota Fruit & Vegetable News site for alerts as your crop moves outdoors.
How can I participate in the Winsome Fly Citizen Science project or use Winsome Fly as a biocontrol for Japanese beetle?
VegEdge points to a Winsome Fly citizen science project led by entomologist Bill Hutchison, and notes that the fly is a biocontrol agent for Japanese beetle that is now naturally spreading in Minnesota. To join or use it, work from the project's own pages rather than trying to sign up through VegEdge, which serves as the news and IPM hub.
Participating in the citizen science project
- Start with the Winsome Fly fact sheet linked from VegEdge — it explains how to recognize the fly and distinguish it from similar species.
- Use the citizen science opportunity announcement to find the current reporting method and contact. The announcement names Bill Hutchison as the lead, so the University of Minnesota entomology group is the authoritative source for protocols, datasheets and submission deadlines.
- Expect to report sightings with location, date and, ideally, a photo. Verification usually depends on clear images of the fly's markings, so practice on known specimens first.
Using Winsome Fly as a biocontrol
Winsome Fly is a natural enemy that attacks Japanese beetle, and the VegEdge note says it is spreading on its own in Minnesota. That shapes how you use it:
- Conservation over release. Because it is establishing naturally, the practical approach is to avoid broad-spectrum insecticide sprays during the fly's activity period and to keep flowering plants and undisturbed soil that support it.
- Patience. Biocontrol agents build slowly; do not expect the same season's knockdown you would get from a targeted insecticide.
- Combine tactics. For high-value crops, pair natural enemies with monitoring and threshold-based sprays rather than relying on the fly alone.
For Japanese beetle management more broadly, you can cross-check advice from U of M Extension and, for regional context, VegEdge.
Decision guide
| Your goal | Best first step |
|---|---|
| Contribute observations | Read the fact sheet, then contact the Hutchison lab via the citizen science announcement |
| Protect a crop this season | Scout and use thresholds; conserve the fly rather than release it |
| Confirm the fly is present | Photograph suspected flies and submit to the project for verification |
Next step: read the Winsome Fly fact sheet on VegEdge, then use its contact details to ask the project team about the current season's reporting form and any training materials.
Where can I find weekly vegetable crop updates and pest alerts for the Midwestern U.S.?
VegEdge is a University of Minnesota Extension resource that publishes weekly vegetable crop updates and pest alerts for the Midwestern U.S. Its "Weekly Vegetable Update" is written by IPM Extension Educators Natalie Hoidal and Marissa Schuh and reports field observations and current pest findings during the growing season. The site also carries a "News & Pest Alerts" section with timely items such as new beneficial-insect fact sheets and produce food-safety updates.
VegEdge
If you want to check it efficiently during the season, start on the VegEdge homepage and look for the Weekly Vegetable Update and Moth Flight links. The Moth Flight Network tracks ECB and CEW moth catches statewide, and the Degree-days section provides state and region-wide updates for key insect pests — useful if you are timing scouting or control decisions rather than just reading general news. A practical routine: check the weekly update for what educators are seeing in area fields, then use the degree-day and moth flight pages to judge whether those pests are likely active in your own region.
For a broader stream of Upper Midwest fruit and vegetable news, the updates point to the University of Minnesota Fruit and Vegetable News site; other regional extension services publish comparable alerts, so cross-checking can help if your farm sits near a state border.
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