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Plum Sawfly



P_plumsawfly

Plum Sawfly

Usually appear in

Spring to Autumn.


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Caused By:-     The sawfly Hoplocamps fuava

Description

The Plum sawfly Hoplocamps fuava lays its egg in the embryonic plum at flowering time. The cream/white larvae burrow into the young plum causing exude a sticky resin. It also distort and causes the fruit to fall early. After being fully fed, the larvae then drops to the ground or if the fruit falls early they crawl out and form a cocoon in the soil. It uses earth particles so difficult to find. Affected fruit will typically have 2-3 small holes. Inside the affected plum, you will find the larvae of the Plum Sawfly up to 1 cm long, creamy in colour. The larvae form a cocoon and over winter in the top 5 cm of soil, ready to pupate at the plum flowering time and renew the cycle. This Sawfly is usually sporadic in its infestation and can usually be controlled relatively easily. Picture from Wikimedia Commons.
See these other Sawflies Apple, Aquilegia, Geranium, Geum, Goosberry, Iris, Large Rose, Plum, Rose Leaf-rolling, Sawflies, Solomom Seal.


Control

Remove damaged fruit from the tree as well as any that have fallen and destroy them. The lifecycle of the Sawfly can be broken at two times. First, in late winter and early Spring, gently loosen and turn the soil around the base of the tree with a trowel or hoe. This will expose the over-wintering pupae for birds to eat. The second action is to spray the tree with a suitable insecticide as soon as possible when roughly half the flower petals have fallen. If this is done correctly next year it should not be necessary to spray again. Organic methods include turning the soil around the base of the tree with a trowel or hoe in late winter and early spring which exposes the over-wintering pupae for birds to eat.



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