Agave asperrima - Rough Agave Care Guide

Erwinia is a genus of plant-pathogenic bacteria that cause fast-spreading rots and blights. On apple and pear, Erwinia amylovora causes fire blight: tender shoots wilt, turn dark, and often bend like a shepherd’s crook; blossoms and twigs may ooze a sticky, amber liquid. In vegetables and many houseplants, related Erwinia-type bacteria cause soft rot: leaves or stems look water-soaked, turn mushy, and smell bad, often starting at wounds or at the crown. These bacteria spread by splashing water, insects, dirty tools, and infected plant parts, especially in warm, wet weather.

Root rot is a serious fungal disease that affects the root system of plants, causing them to decay and die. It is primarily caused by overwatering, poor drainage, or soil-borne fungi such as Pythium, Phytophthora, Rhizoctonia, and Fusarium. The disease thrives in waterlogged conditions where roots are deprived of oxygen, making them susceptible to fungal infection.

Overwatering occurs when plants receive too much water, depriving roots of oxygen and causing root rot. This environmental stress is one of the most common causes of houseplant death, as waterlogged soil prevents roots from breathing and functioning properly.

Fusarium wilt is a serious fungal disease caused by the soil-borne fungus Fusarium oxysporum. The fungus invades roots and blocks the water-conducting vessels (xylem) of the plant, causing progressive wilting and eventual death. Host-specific forms of the pathogen exist that attack different plant species.