One of the essential applications of remote sensing technologies in the agricultural sector is on plant protection.
The various applications and management practices necessary for any type of crop can be greatly enhanced when supported by remote sensing.
Some widely used examples follow:
Satellite spectral imaging is widely used for detection of plant damage by pests and diseases.
The advantages of satellite imaging when using sensors such as Sentinel-2 or Landsat 8 are low cost and provide fast detection of plant spectral reflectance over large areas. They are often used as an early indicator of damage by a pest or disease or for mapping the current spread of the disease or pest.
UAVs equipped with multispectral or hyperspectral cameras allow for greater quality of spectral and spatial data, that can be used for zoning and differentiating applications in-field.
UAVs can also be dispatched with variable rate sprayers and, when paired with on-board cameras or pre-designed flight plans, provide an extremely detailed and precise method of applying agrochemicals on point.
A large part of applied scientific progress is aimed at agricultural research and a great number of scientific papers are published each year, detailing the platforms, sensors and methodologies used to address various crop protection issues.
You can find a recent review of Zhang et al. 2019 the following link, making a summary of the latest developments in scientific papers concerning remote sensing systems and features, feature selection techniques, monitoring algorithms and models related to monitoring of pests and diseases.