Abstract

Damage of fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith) on sorghum from the farmers’ fields of southern India was assessed using space-borne data. Comparison of the Sentinel-2A satellite data of pre and post infestation periods revealed reduction in Leaf Area Index (LAI) in the infested fields. Groundtruth data confirmed that FAW infestation reduced LAI by 49.7%, biomass by 32.5% and grain yield by 51.8%. Infestation at Panicle Initiation (PI) stage caused maximum yield loss compared to flag leaf visible and boot stages. The interaction results showed FAW infestation at different crop stages had significant effect on biomass and yield, but not on LAI. Regression analysis with spectral vegetation indices revealed LAI (R²: 0.82) and NDVI (R²: 0.80) were significantly superior in identifying FAW infestation from the satellite data. This study demonstrates feasibility of site specific pest management and prevents further spread of the invasive FAW.

摘要

使用星载数据评估了秋天粘虫（FAW），斜纹夜蛾（Spodoptera frugiperda）（JE Smith）对来自印度南部农民田地的高粱的危害。比较Sentinel-2A卫星侵染前后的数据，可以发现侵染田地的叶面积指数（LAI）有所降低。Groundtruth数据证实，一汽侵染使LAI降低了49.7％，生物量降低了32.5％，谷物产量降低了51.8％。与旗叶可见阶段和引导阶段相比，在穗萌发（PI）阶段的侵扰导致最大的产量损失。交互作用结果表明，不同作物阶段的一汽侵染对生物量和产量有显着影响，但对LAI没有影响。用光谱植被指数进行回归分析显示LAI（R ²：0.82）和NDVI（R ²：0.80）在从卫星数据中识别一汽侵扰方面具有明显优势。这项研究证明了现场特定有害生物管理的可行性，并防止了侵袭性一汽的进一步传播。