There also appears to be an increased rate of anal cancer in high-risk groups (in particular, men who have sex with men). This is unsurprising considering the link between anal cancer and human papillomavirus (HPV), and the fact that cervical cancer, also caused by HPV, is considered an AIDS-defining condition. HIV Encephalopathy is a severe condition usually seen in end-stage disease.
Gray Mold. There are different types of fungus that grow on plants for a variety of reasons. Gray mold on plants is caused by overhead watering, low temperatures and low humidity levels. Poor air circulation around the plant is another problem with this type of fungus, as well as low nitrogen levels in the soil.
Bacteria as plant pathogens can cause severe economically damaging diseases, ranging from spots, mosaic patterns or pustules on leaves (Figure 5) and fruits, or smelly tuber rots to plant death. Some cause hormone-based distortion of leaves and shoots called fasciation (Figure 6), or crown gall, a proliferation of plant cells producing a swelling at the intersection of stem and soil (Figure 7) and on roots.