Environmental factors influencing the growth and spread of "Pantoea agglomerans" include winter chilling, good sunlight exposure and quality air circulation. Fruit-bearing trees, such as apple and pear trees are common "Pantoea agglomerans" hosts and during blooming season the fruit-bearing trees receive a period of chilling to revive them from their dormant state in the following Spring. In terms of sunlight exposure, fruit trees generally grow best in warm, moist and well-lit environments, thus "Pantoea agglomerans" must also be able to survive under these conditions if it hopes to infect healthy plant hosts. "Pantoea agglomerans" is an aerobic bacterium, so it requires a certain level of air circulation in order to survive.