Spotted Lanternfly nymphs will be emerging now through the first week of May for Southern and Central New Jersey – reduce their population early in the nursery industry!
Through conversations with nursery operators, state inspectors (NJDOA), and internal agent communications four shade trees represent the vast majority of nursery stock with adult SLF eggs. This means we should be targeting these trees early – treating for nymphs as they emerge from the egg masses and before they move on to more tender hosts.
The vast majority of shade trees with egg masses in NJ are:
- Red maple – huge proportion
- Birch
- Willow
- Styrax
- Tim Waller’s compiled ‘Common Host Plants for SLF in NJ’ – with notes on life stages and controls (click here) (with information from Penn State, NJDOA, Rutgers)
Generally, adults are laying eggs on these four nursery crops late summer/fall, then as the nymphs emerge (April/May) they move to more tender growth, often onto understory plants, weeds, hedge rows, roses (wild and cultivated), and tender herbaceous and perennial plants (May, June, early July). This means we have a very short window to target a large percentage of nymph emergence on these four crops with Contact Insecticides. Scout these areas for nymphs over the next few weeks, and be at the ready to treat immediately.
Be ready to target nymph populations early this season with contact materials
Once the nymphs have moved on to their favored 1st-3rd instar crops (herbaceous, perennial, roses, grapes, etc.) they will then begin to move back to these four shade trees (and other woody hosts) as 4th instars (red-coloration, mid/late July) and adults (August) that will ultimately mate and lay eggs (September/October), repeating the cycle.
Systemic materials – Generally systemics are best utilized when targeting late instars and adult populations (both born at the nursery and flying in from outside), often requiring approximately 3-4 weeks prior to anticipated insecticidal activity. In the nursery setting we may already be utilizing systemic materials to treat other insect populations, offering some level of protection from the nymphs migrating away from theses four shade trees, towards their favored feeding locations. In operations where egg masses have been abundant, treating with systemic materials, when appropriate should be considered to reduce local populations in addition to targeting nymphs with contact materials.
Penn State – Spotted Lanternfly Management Guide (click here) – Contains the most complete list of labeled systemic and contact insecticides for SLF
Note – applications during bloom for specific host crops should be avoided to protect pollinators.
Additional information:
We are collectively trying to avoid crippling load-by-load phytosanitary inspections:
WE as an industry are in this together, in order to safeguard our industry please do the following:
- SLF Training Permits for hang-tags (click here) are required for each company driver who delivers your plants out-of-state. This training is relatively simple and you can also obtain Training materials to educate your employees (click here)
- Scout every plant for ANY SLF life stages – from dead adults to egg masses. REMOVE life stage prior to shipment and train employees to know the various appearances of SLF egg masses. Use this guide – SLF EGG MASS GUIDE – USE FOR TRAINING (click here to download) (print and hang up / distribute to personnel)
