Plantix is an Android based app that helps farmers take a photo of the crop and instantly give the report on the quality of the crop.
Plantix App Helps Farmers Find Crop Disease Instantly.
It compares the image with its database for patterns and provides details on crop infestation as well as remedy for the same.
They also provide a database of Plant Diseases here: https://plantix.net/plant-disease/en
In addition, they also provide live tracking of the most common infestations.
We highly recommend the farmers to use an app like this one to get real time updates on the quality of their crop.