Seed and microbe
-On the surface of all seeds, there are microorganisms, and when the seed with the microorganism is planted, it may have the interference of growth or other disease to have problem in growing the crops. That is the reason for the seed sterilization.

Root and microbe
-The seed is germinated to have the root to grow into the soil or above the soil to have numerous microorganisms around the root. Because of the nutrition from the root, the root surface (near to the surface) has particularly much number of microorganisms. Some of the microorganism penetrates to the root and cause an illness. In particular, the illness may occur more when the root has damages. However, On the surface of the root, it has anti-fungal stains that may defeat the pathogenic bacteria, and with the higher density of the anti-fungal stains, it may control the diseases even if there are pathogenic bacteria present.

Leaf and microbe
-On the leaves and stem of crop, there is a group of microorganism called leaf microorganism, and most of them are bred from the seeds of the microorganism. The persistent problem in growing crop is the fungus disease on the leaf, and this is the phenomenon that arises by the spore of fungus attached on the leaves to penetrate and breed into the leaf when the temperature and humidity become proper.

Fruit and Microbe
-On the surface of the fruit, the microorganisms are there, and with the particular danger of losing the damages by the microorganism for high sugar contents in grape, strawberry and others,. When the temperature and humidity are high before harvesting, the agriculture chemical is frequently sprayed to kill the microorganism.