In many parts of the country we are experiencing very high levels of rain fall. This comes at a time when large amount of oxygen are needed in the soil. If soil drainage is not efficient in the soil where the fruit trees are planted, the trees can literally drown. Where there is excess water around the roots of the trees, the oxygen-bearing air is driven out of the soil and the roots die. The effect will not be visible immediately. However, as soon as droughty conditions return, the symptoms will be clearly visible: shoot die-back. More seriously, the trees’ immune system will have been seriously damaged. This means the trees will be an easy target for all types of fungal diseases, such as tree canker, armillaria root rot, collar rot, silver leaf, just to name a few.
Summarising, the soil is the tree’s home. It pays handsomely to ensure that all surplus water, up to a depth of 2 feet of soil, can drain away without any hindrance. Air can enter the soil again and all will be fine.
Flooding conditions, photo by Dave Gunn/flickr.com
Check your pheromone traps for codling and plum moths. Renew the lure if necessary. Start spraying the apple varieties which have a tendency towards bitterpit in the fruits. Apply fruit nets where bird trouble might occur, cherries in particular. Continue thinning out the fruitlets to doubles or singles. Remove scabby fruits at the same time. Start the summer pruning programmes of plums, cherries and greengages. The same applies to nectarines, peaches and apricots. Hang rolled up corrugated cardboard in the trees to attract the caterpillars which would otherwise damage foliage and fruits. Regularly inspect and renew when caterpillars are caught. Deal with aphids if present in too large a number in folded-up shoot tips. Do not let the trees dry out. This in particular applies to potted trees. Continue with foliar feeding if foliage of the fruit trees is not up to the mark. Make a start on preparing the ground where new trees will be planted in the autumn.
After natural drop, in June it is advisable to reduce the number of fruitlets in a group like this
Your young fruit trees are now at top activity; new roots and shoots are being formed and young fruitlets are appearing. Therefore additional water, one full watering can a week, will help the tree very much. Any tree planted in a pot or a container, whose roots are therefore restricted, will need extra moisture in particular.
By the end of June, the clusters of young fruitlets will have to be thinned out. Two fruits per cluster will be plenty. Make sure these clusters of young fruitlets are spaced out. Approx. 6 to 8 inches apart is about right. The reason for this is because for each fruit to be able mature properly, it will need the help of 20 fully grown leaves.
Now is the optimum time to place your pheromone traps. Just read the notes placed for the month of May for further details.
After thinning, the result should be 2 fruitlets per group