# Bark beetle pre-emergence detection using multi-temporal hyperspectral drone images: Green shoulder indices can indicate subtle tree vitality decline

*PRI Rank #18 · Topics and Trends in Most Cited Forest Insect Ecology and Management Papers, Class of 2026*

*Canonical URL: https://pri.pepkio.com/top-papers/forest-insect-ecology-and-management/2026/rank-18*

| Field | Value |
| --- | --- |
| Rank | #18 |
| 18m citations | 14 |
| Journal | ISPRS Journal of Photogrammetry and Remote Sensing |
| Year | 2024 |
| DOI | 10.1016/j.isprsjprs.2024.07.027 |
| Corresponding authors | Langning Huo |
| Institution | Swedish University of Agricultural Sciences, Sweden |

**Ranking page:** [Topics and Trends in Most Cited Forest Insect Ecology and Management Papers, Class of 2026](https://pri.pepkio.com/top-papers/forest-insect-ecology-and-management/2026)

**Paper link:** [10.1016/j.isprsjprs.2024.07.027](https://doi.org/10.1016/j.isprsjprs.2024.07.027)

## Topics

bark beetle pre-emergence detection · Ips typographus · UAV imagery · green shoulder region · first derivative reflectance · second derivative reflectance · green shoulder region · multi-temporal monitoring · tree vitality decline · brood emergence timing · filial generation (F1 and F2) · spectral separability · Photochemical Reflectance Index · Red Edge Inflection Position · Picea abies · forest health monitoring · photochemical functioning · bi-weekly image acquisition · detection rate quantification · simplified multispectral indices

## Cite this ranking

```
Pepkio Research Index (PRI). Topics and Trends in Most Cited Forest Insect Ecology and Management Papers, Class of 2026. https://pri.pepkio.com/top-papers/forest-insect-ecology-and-management/2026. Accessed 2026-07-31.

Zheng Su, Tinsley Li, Thematic Shifts in Early-High-Impact Cancer Genomics and Diagnostics Research: A Bibliometric and Semantic Analysis. bioRxiv 2026.07.04.736459; doi: https://doi.org/10.64898/2026.07.04.736459
```