This was the title of an article in the March 2021 Viticulture Notes by Tony K. Wolf, Viticulture Extension
Specialist, AHS Jr. Agricultural Research and Extension Center, Winchester,
Virginia and based on information from Dr. Doug Pfeiffer’s fruit extension site: https://www.virginiafruit.ento.vt.edu/.
For those of us in Fairfax County Virginia, the 17-year, periodical cicada ‘Brood X’ has emerged in full force creating a mess on our driveways and walkways while emitting a deafening racket. According to the Viticulture Notes article, residents of the northern Shenandoah Valley and parts of the northern piedmont can expect a similar situation. But what effect will the cicadas have on vineyards? I reached out to several growers and wine producers and want to thank Jake Busching (Jake Busching Wines), Shannon Horton (Horton Vineyards), Jennifer Breaux (Breaux Vineyards), and Jack Sexton (Williams Gap Vineyard) for their responses.
Jake Busching had the most succinct answer. "Cicadas will harm new canes. They have a saw on their abdomen that cuts deep furrows into the cane so they can inject their eggs. The cane will most likely die from that point outwards. If you have older pruned vines you’re fine". And Wolf explains, "...because lateral buds and shoots can easily compensate for the shoot damage that can occur with older vines ... injured shoots will be pruned off later ". He continues, "However, young vines are subject to severe injury, with females using even the trunks as oviposition sites. Oviposition may occur at multiple sites on one shoot or young trunk; affected areas become weak and will break easily (Eggs in the shoots may be seen on dissection of the injured material). Young vineyards should be protected."
It's obviously too late now, but the best advice is not to plant a new vineyard 1-2 years before an expected emergence of periodical cicada.
Agriculture is at the heart of the wine industry and every wine region faces some type of peril. On the east coast, the newest threat is an invasive species native to China, Bangladesh, and Vietnam: the Spotted Lanternfly (also surfacing on the west coast as well).
According to Dr. Joe Fiola, of the University of Maryland Extension, the "pest was first detected in the United States in 2014 in Berks County, Pennsylvania and was accidentally imported from China through a shipment of decorative stone. The pest quickly spread and has decimated vineyards in southeastern Pennsylvania and has the capacity to inflict major damage to hop fields and hardwoods as well. Dr. Joe says the pest has spread into Maryland's Cecil and Harford Counties, West Virginia, and in Winchester Virginia at a stone and block company site. Here is how the University of Maryland Extension describes the damaged inflicted by the Spotted Lanternfly:
Both nymphs (immatures) and adults of spotted lanternfly cause damage when they feed, sucking sap from stems and leaves. This can reduce photosynthesis, weaken the plant, and eventually contribute to the plant’s death. Additionally, spotted lanternfly feeding creates a sugary substance called honeydew. This honeydew, in addition to being attractive to ants, wasps, and other insects, is readily colonized by sooty mold, which can cause parts of the plants to become blackened and look unsightly.
So how do vineyard managers fight the pest, particularly when there are no known natural enemies for biological control? Dean Scott of Pennsylvania's Bergeist Vineyard is fighting the pest through spraying and the Virginia Cooperative Extension at Virginia Tech recommends a set of insecticides (E=Excellent, G=Good). They recommend the Pyrethroids - Brigade (bifenthrin) (E) and Mustang Maxx (zetacypermethrin) (G) and the Neonicotinoids - Actara (thiamethoxam) (E), Scorpion (dinotefuran) (E), and Admire Pro (imidacloprid) (G).
At the Vineyards At Dodon, in Anne Arundel County Maryland, the winery has taken preemptive measures according to Director of Client Services Regina McCarthy starting with removing several Tree-of-heavens (Ailanthus altissima) - a deciduous tree native to China, that the Spotted Lanternfly is particularly attracted to lay eggs on.
As a consumer, the best support you could provide is to continue to, or start to, imbibe local wines. At some point, you may become personally affected as these pests invade your backyards. At that moment you become the predator. Here's how to identify the pest courtesy of Penn State Extension.
