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Disease in apple trees

WE HAVE AN ORCHARD OF 18 APPLE TREES WHICH HAS BEEN NEGLECTED SINCE PLANTING 10 YEARS AGO. THERE ARE 10 VARIETIES ALL PURCHASED FROM SEED SAVERS THEY ARE HERITAGE APPLE TREES.AND WERE ORIGINALLY SUBJECT TO A FARMING GRANT. NOW WE ARE RETIRED FROM FARMING AND IN OUR 80.S HAVE MORE TIME TO TAKE FULL INTEREST IN THE ORCHARD. SEED SAVERS HAVE THIS SAME QUESTION PENDING AND IT WILL BE SEVERAL WEEKS BEFORE THEY ANSWER.OUR PROBLEM IS IN THE :MRS PERRY: TREE WHICH PRODUCES LOVELY BIG APPLES THEY DO NOT KEEP AND GO BAD FROM THE MIDDLE ALSO THERE IS A HOLE GRINDED INTO SOME TREES WHICH COULD BE CODLING MOTH. WE HAVE FED BORON TO ALL THE TREES BUT STILL MRS PERRY APPLES STILL GO BAD FROM THE CORE. CAN YOU SUGGEST FURTHER HELP ? ANGIE, ROUNDWOOD, Co Wicklow Posted: 06/10/2017

Codling moth can affect apples and is more severe in some seasons. Collect and destroy affected apples as soon as they fall. Spraying with garden insecticide is possible, immediately after flowering and two weeks later. 

Browning caused by tissue breakdown is not all due to boron but calcium, nitrogen and potash are also involved as is the weather. Apply a shake of garden lime and 30grammes of potash per square metre in March to harden growth.

Do not apply any nitrogen-rich fertiliser such as manure, chicken pellets or compost. This is a question of balance and takes time to achieve. Some varieties are more susceptible.

 

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