All flower parts are very susceptible. Rotting blackberries in their crates occurs due to heavy handling during harvest and storage. Fungicides are available but should not be overused due to resistance development in the fungal populations. In moist conditions, the diseased fruit develops a characteristic coating of powdery, gray-brown fungus. A moist, humid environment is ideal for sporulation and spread of this fungus. · blackberry penicillium fruit rot is a fungal disease that primarily occurs on post-harvest fruit. This fungus is ubiquitous and attacks many different fruit and ornamental crops. · the disease is characterized by a watery, soft rot of infected fruit, either in the field or in storage. Some blackberry fruit rot also occurs on the canes but not in usual circumstances. · fruit rot of blackberry is difficult to control once the disease is established. Read on to learn about blackberry fruit rot causes and steps you can take to prevent this pervasive disease from occurring in your garden. Wet weather just before and during bloom is important for disease development. Botrytis fruit rot and blossom blight is caused by botrytis cinerea, a fungal pathogen able to infect not just strawberry, but several hundred plant species, including many other important fruit crops (e. g. Blackberry , grape, raspberry). Timely harvest and spacing plants for good air circulation help prevent fruit rots.