Posted: 27/01/2015 at 12:14
Last year, my small and very enclosed urban garden aaas decimated by thrips.
I tried everything: SB invigorator spray which worked very well, but it rained a lot in spring, when I was away, so that didn't help and they had really settled in by the time I returned.
I tried thrip nematodes too - waste of money - though i use slug and weevil nematodes every year and they are brilliant. Unfortunately, thrip nematodes have to make direct contact with the insect, via a spray, so unless you get the buggers as they're flying off, no good.
I don't like spraying chemicals, because my garden, though tiny, has 3 frogs that visit regularly, as well as loads of pollinating insects and birds.
So once the annual insects had died off in late December, the birds were out of sight and the frogs too, I sprayed the whole lot within an inch of its life, to try and kill any eggs lying about.
I also cleared lal fallen annual and hardy perennial leaves ext, which I hadn't done previously, to remove as much diseased stuff as possible.
I've also winter washed my two dwarf acers and dwarf apple tree.
All is looking good, but right up until early December 2014, here in London it was very milk and the blooming' thrips were still flying out in clouds from their favourite nibbles - Japanese anemones, hellebores, hebes....
Some plants were so decimated last year, they've died over the winter (my favourite hebe Pascal ) and many hardy geraniums and anemones which had been glorious in previous years, didn't flower at all in 2014.
I am fed up!
Has anyone else had this problem and found the best solution for it?
Have I missed something crucial? Ought I spray again before Spring perhaps, or do something else?
My tiny garden is my oasis and I was so down when I saw it being chewed up...even a vine weevil infestation and red spider mite infestation were easier to handle than thrips and I managed to get them under control.