My plumb tree leaves are covered covered in flies and wasps, please advise why. Thanks.

this is bad -
see
http://www.sgaonline.org.au/citrus-gall-wasp/
had a lemon tree in Victoria it would have been 30 years old was starting to get this wasp. My brother in law lost a lemon tree from this as it sucks the goodness out of the lemons and the tree.

This will happen, - if the Tree needs feeding, you may find it needs an acid type of Feed +Soil - also where you are keeping the potted tree usually better at this time of year under cover eg greenhouse, also check the leaves for bug infections.

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Fruit Tree Curly Leaf Treatment

Citrus Leaves Are Curling What Causes Citrus Leaf Curl

Leaf curl Wikipedia

G'day Patti, unless you want to look beyond the tree it would be advisable to leave the lower leaves and branches. The lower branches hide little critters from big critters. Cheers Greg.

Cover your tree in a fine net when the figs start to form after blooming. I know wasps like to lay their eggs in them, and those fruit usually fall off. Probably the same with the passion fruit.

your are talking about ground hornets kill them they are dangeruse and will attack lawn mower

Spray with a mixture of dishsoap and water 10/1 to kill the bugs.

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A few soapy mix in spray bottle sprayed on flying things like bees and wasps will cause them to drop like flies. Obviously be careful that others don't sneak up on you and that they're not africanized bees! This is for when they haven' t made a complete hive yet and there isn't a lot of them.

Cover yourself as much as possible, ie long clothing, gloves, hat, scarf etc.that is light (ie white) in color. Don't look like a flower. Then use a sprayer of some sort, bottle with longer reach or garden hose with spay applicator etc. Spray them then get out of there quickly. :) The soap will prevent their flying so they can't get food or water. You may have to do this more than once until none are around anymore.

Do NOT do this if you're allergic to bees! Call a beekeeper.

Home depot has a wasp spray that shoots around 15-20 feet,, and It works, Ive used it ,, and I like the long distance sprayer !! Its this stuff http://www.homedepot.com/Outdoors/h_d1/N-5yc1vZbx82Z1z0zw43/R-100352314/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053