Mendoza's 90,000-Hectare Grapevine Moth Fight Goes Airborne

Mendoza has greenlit a 90,000-hectare aerial and drone insecticide campaign aimed squarely at the grapevine moth. That's roughly the entire vineyard surface of Argentina's flagship wine province, and the first time unmanned rigs are being folded into a coordinated provincial moth push at this scale.

The target is Lobesia botrana, the European grapevine moth, whose larvae chew flower clusters and ripening berries. Mendoza underpins Argentina's wine exports, so any flare-up is a commercial headache rather than a curious headline.

Treating the province at once, rather than block by block, is meant to deny the pest the untreated refuges it normally uses to bounce back from voluntary control efforts.

What does 90,000 hectares buy?

A single coordinated operation rather than the patchwork of voluntary sprays that usually follows an outbreak.

Mixed fleets of manned aircraft and drones are uncommon in South American spraying: aerial work typically means fixed-wing planes, sometimes helicopters, full stop. The drone half is the curious bit: lower drift, faster turnaround on smaller blocks, but payload limits that still make planes the workhorses for wide holdings.

Adding them in suggests authorities wanted every awkward corner covered, not just the easy rectangles.

Why mix planes with drones?

Planes carry the broad hectare count quickly and cheaply per litre. Drones handle fiddly parcels, steep slopes and re-treats where ground rig access is awkward. Done together, the two systems fill each other's gaps.

Drone operators can also be told to stay away from schoolyards and organic parcels, which is becoming a non-negotiable in wine regions with mixed neighbours.

Why now?

Grapevine moth overwinters as pupae and emerges as the spring warms. Late interventions after flowering are far less effective than early strikes against adults.

Provincial schemes tend to launch in the cooler months rather than after bunch closure. Aerial reach matters here: ground rigs in the Uco Valley can take days to cover what a plane does in hours, particularly across the high-altitude zones that climb above 1,200 metres.

What does it change for growers?

Inside the mapped boundary, growers usually pay nothing or hand over a token contribution. Outside, the choice is to absorb the cost of an independent spray or wait and risk reinfestation from neighbours who declined.

Coordination matters because moth populations don't respect plot lines. A single uncooperative parcel can seed a season's worth of headaches across a thousand hectares downstream.

What's the catch?

Spray campaigns only work if the chemistry holds. Resistance has nibbled at insecticidal classes across Latin America over the last decade, so the active ingredient list deserves a closer look than the headline numbers.

Aerial application also raises drift questions near villages and organic blocks, which is part of why drone work is creeping in for the awkward edges.

And province-wide campaigns always carry a free-rider problem: a few growers skimping on the levy while expecting the coverage to do the work.

The numbers to watch next: moth trap catches before flowering, total treated hectares reported by province, and any compensation claims from neighbouring organic growers. If pressure stays low through veraison, expect the model to return next season with refinements rather than a full rewrite.