 Crop diseases have been a major issue in agriculture for centuries, leading to food loss and decreased productivity. To combat this problem, several laboratory-based and indirect detection methods have been developed. Direct detection methods include PCR, IF, FISH, ELISA, FCM and GCMS, while indirect methods include thermography, fluorescence imaging and hyperspectral techniques. Additionally, biosensors based on enzymes, antibodies, DNA slash RNA and bacteriophages can be used to detect crop diseases at an earlier stage. This article was authored by Yifong and Ramarajat P. Ramasamy.