Which disease is attributed to both Botryosphaeria spp. and Fusicoccum spp. in avocados?

The disease attributed to both Botryosphaeria spp. and Fusicoccum spp. in avocados is Branch Canker and Dieback. This disease is characterized by the wilting, dieback, and eventual death of branches on avocado trees. Both pathogens are known to cause this issue by infecting the tree and leading to the development of lesions that disrupt the flow of nutrients and water within the plant.

In contrast, the other diseases listed are caused by different pathogens. Anthracnose, which is caused primarily by Colletotrichum spp., primarily affects the fruit and foliage rather than causing branch dieback. Crown Gall is caused by Agrobacterium tumefaciens and results in tumors and growths primarily at the crown of the plant, while Avocado Root Rot is mainly caused by the pathogen Phytophthora cinnamomi, affecting the root system and leading to decline and death of the tree through root damage.

Thus, Branch Canker and Dieback specifically relates to the causal pathogens mentioned in the question, establishing it as the correct answer.