Entire leaf wilts and stem rots. Possibly caused by bacteria leaf spot, cirus, edema or dropsy. Improve light conditions, reduce humidity. Do not overwater. Pick off and destroy infected leaves.
Plant grows lopsided.
Caused by incorrect light, humidity too low, temperature too high. Move plant to a better light source. Move plant to a cooler, less lighted location. Fertilize, and increase humidity. Aerate existing soil or replant using more porous soil.