Thinning treatments used with considerable success in North America for many years comprised a spray of Elgetol (DNOC) as a flower thinner, followed by sprays of carbaryl or NAAm. Recently, researchers at East Malling have investigated the use of other, …
Hand thinning is the best way to achieve the correct crop load and ensures that the largest and best shaped fruits are retained. It also allows the best fruitlet distribution on the tree to be established by allowing fruits in poor positions on the …
According to Bangerth (2000) there are, currently, two hypotheses advanced to explain the abscission of young apple fruits: Abscission is caused by insufficient supply of assimilate to fruitlets as a result of limited assimilate production and/or …
Several natural plant hormones have been implicated in the tree processes leading to flower and/or fruitlet abscission (drop). Most of the literature cites ethylene as the main promoter of flower, fruit or leaf abscission in trees, including the apple. …
Several types of chemicals have been shown to have thinning action when sprayed onto apple trees. The influence of most of these is increased if they are applied in low light conditions ( Byers et al ., 1990a; 1990b ) because the competition between the …
The natural abscission (drop) of flowers and fruits Fruitlets were traditionally thought to drop off in response to the death of their seeds (embryos) and the cessation of the supply of auxins from the live seeds across the abscission zone in the fruit …
Ensure that fruitlets set with adequate number of seeds Encourage cell division and expansion in fruitlets by optimising orchard management Prune and train trees so as to optimise exposure of fruit to light Maintain adequate and balanced tree nutrition …
Research conducted in New Zealand has shown that enhancing the pollination of the variety Braeburn not only increases fruit set but it also increases seed numbers and the calcium content of the harvested fruits ( Volz et al ., 1996 ). Further research in …
Fruits with few seeds may, in some seasons, be slightly misshapen or smaller and it is always recommended policy to ensure setting of fruits with many seeds. Ensure that apple fruits are set with adequate seed numbers by: The planting of suitable …
Work conducted in the USA, using equipment capable of measuring the light interception of the various types of leaves and the gas exchange associated with a whole apple tree, has enabled scientists to work out the photosynthetic potential and the tree’s …
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