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Raspberry Leaf and Bud Mite



P_rasplfbdmite

Raspberry Leaf and Bud Mite

Usually appear in

Spring to Autumn.


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Caused By:-     The Mite Phyllocoptes gracilis

Description

Raspberry Leaf and Bud Mite Phyllocoptes gracilis belongs to the Eriophyoidea or Tetrapodili which is a superfamily of herbivore mites. These mites are tiny sap-sucking pests that lives on the underside of the leaves during summer and overwinters in and around the buds on raspberry canes. They emerge from May onwards and begin feeding from the underside of the leaves.
The feeding on the leaves of Raspberry gives rise to distortion and irregular yellow blotching on the upper surface of leaves which can be confused with a virus infection. Apical buds are sometimes killed, leading to the development of weak lateral shoots. Attacks on fruits causes malformed fruit, uneven ripening.
This pest mainly attacks canes which are in a sheltered position, such as, behind windbreaks and in hollows in fields.
Despite being heavily infested plants are still able to produce a worthwhile crop of fruit.
Wild raspberries growing in woodlands are a source of this pest.


Control

Many acaricide and insecticides have been removed from sale due to new regulations, but there are a few systemic insecticides that might help to eradicate this pest.
A winter tar or plant oil wash should help reduce attacks.
There are a few naturally occurring parasites of this pests, like Typhlodromus pyri, that help to keep attacks in check. Do not plant canes in very sheltered positions and use varieties that show good resistance to this pest.
Weaken the plants make them more susceptible to attack. Therefore mulch and fertilise plants during the winter dormant period. Ensure that they are well spaced so that air circulates and the canes dry out quickly after rain or heavy dew.
Raspberries will pick up diseases and viruses over the years which gradually reduce their productivity. Therefore it might be sensible to replace the plants with new stock every five to seven years.



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