Apple tree disease - FireblightThe Fireblight is a highly contagious bacterial and lethal apple tree disease. The disease can be transmitted by water, wind, birds or even bees so there are no way to keep clear of this thing. Once infected, an apple tree will show signs of injuries, almost like it has been scourged by fire. Blackened and cracked areas are what you are looking for. When detected, the damaged parts should be cut off and taken to a safe place, or even get burned. Afterwards wash the tools thoroughly not to risk any further infection.
Apple tree disease - Apple scabThe Apple scab is a fungus that looks like rust on the apple tree leaves, fruit and buds. Not known to kill the apple trees it can really reduce the number of fruits you will get and the quality of that fruit, plus it looks awful. To make things right you will have to remove every sign of the fungus and incinerate it. Hopefully the tree will survive and bear fruit the next year.
Apple tree disease - Black spotSimilar to Apple scab, the Black spot is a fungus. The difference is that this apple tree disease only affects the leaves and manifests itself as small black spots. Once visible on a leaf, the leaf will soon yellow, wither and fall off. To stop this, you will need to go through the same procedure as with the Apple scab.
Apple tree disease - Black rotThe Black rot is also similar to the Apple scab, being a fungus and all, but affects mainly the fruits. If you find hard black dots that appear to rot your fruits from the inside out, you have got a sure sign of the Black rot. This apple tree disease can then spread to the leaves and branches to the rest of the apples and destroy a whole crop. Getting rid of this is fairly simple, just pick the apples that show the signs and throw them away. If the disease has already spread you will need to repeat the procedures already mentioned, getting rid of this apple tree disease.
The government of the USA has for a long time been researching in apple tree diseases and has planted a couple of new apple trees at a research facility. The goal is to create a new kind of tree which fruit will be more resistant to many diseases and pests and by that means increase their yearly production of delicious apples. Future research into apple tree disease is to be expected.
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