A paper of 5 October 2026 in PLOS Neglected Tropical Diseases evaluated ground ultra-low volume (ULV) spraying with deltamethrin plus pyrethrum extract in Hungary, using a before–after–control–impact (BACI) design: mosquito numbers at treated sites fell by about 47% on average, while non-target flying insects, including pollinators, fell by more than 40%.
Main points
- Journal: PLoS Negl Trop Dis 20(10): e0014140. DOI 10.1371/journal.pntd.0014140. Received 9 March 2026; accepted 21 September 2026; published 5 October 2026. Authors: Garamszegi LZ, Nagy G, Klein Á, Szentiványi T, Vásárhelyi Z, Markó G and colleagues.
- Method: licensed professional companies sprayed from truck-mounted mist sprayers between 10pm and 2am in June–August, using Deltasect Plus 20 ULV (2.22% deltamethrin + 0.22% Chrysanthemum cinerariaefolium extract) diluted 1:15 or undiluted Deltasect Plus 1.2 ULV. Mosquitoes were caught with BG Sentinel traps and other insects with Malaise traps, sampling about 24 hours before and after spraying.
- Native and invasive mosquitoes (Aedes albopictus, Aedes koreicus) fell by similar proportions. Results varied widely between sites: the decline was linked to initial mosquito abundance and maximum wind power during sampling, but not to distance from the spray vehicle’s path, spraying time, rainfall or temperature.
- The authors note that a reduction below 80% is usually considered insufficient for meaningful suppression where nuisance is high or arboviruses are circulating, and conclude that ULV spraying involves a trade-off between reducing mosquitoes and protecting insect biodiversity.
VPMA’s note
A short-term study in Hungary. A point for members doing space spraying: check wind before spraying and assess mosquito density before and after treatment. It does not imply that the products named are registered in Vietnam.
- Source
- PLOS Neglected Tropical Diseases
- Published
- 5 October 2026
- Section
- Research · Insects, Chemicals
- Journal
- PLoS Negl Trop Dis 20(10): e0014140
- DOI
- 10.1371/journal.pntd.0014140
Editorial note: This is a short summary and comment by VPMA, not a full copy. The original text and copyright belong to the source cited. Picture: Figure 4 of the PLOS NTDs paper (non-target insects by group before and after spraying, CC BY licence).
Source: PLOS Neglected Tropical Diseases (summarised in English by VPMA). Read the Vietnamese page.