Symptoms Typical of Severe Anthracnose Infection on Blackberry
Whitening of drupelets on the fruit, mainly on upper surface of the fruit and on the side of the row which receives the most sun, is as you can guess, due to sun exposure. This problem is also frequently seen on red raspberries, and may occur on both crops at the same time. It can occur whether temperatures are high or not, and is often more noticeable following a period of very clear days. There is no cure, and the problem clears up once weather conditions change.