Have you tried sticky traps? You can put mesh around them to stop bees getting stuck if that puts you off. I'm trying an experiment by allowing spiders to take over my greenhouse to control bugs. Limited success so far but there's a lot of spider webs in there.
I've got "fly papers" in there to combat the invasion of cluster flies, but the whitefly never fly that high. My concern is that moving about 60 odd agapanthus and sundry other plants in there , it'll be like a banquet for them.
How bad is it @Hostafan1 ? I know you have a very large one (more ooer missus!) but are the whitefly on many plants, or currently confined to just a few? If the latter or if some plants are heavily infested I would move those outside and well away or even consider sacrificing them. Whitefly is a absolute s*d to eradicate in large covered areas. 😖
A trowel in the hand is worth a thousand lost under a bush.
How bad is it @Hostafan1 ? I know you have a very large one (more ooer missus!) but are the whitefly on many plants, or currently confined to just a few? If the latter or if some plants are heavily infested I would move those outside and well away or even consider sacrificing them. Whitefly is a absolute s*d to eradicate in large covered areas. 😖
Yup, that's the trouble, the tunnel is the "hot" one, all polythene, no netting and is 48ft by 21ft. I've left the doors open at night for a few weeks now as it's cooling down and I've gone over everthing with a fine spray on the end of the hose but they've really taken hold.
I think you're probably going to have to go down the predator route, with tiny Encarsia formosa wasps. I'd try spraying the plants with soapy water first to keep some control over the winter and introduce the wasps next spring once the temps in there won't fall below 10C (or close it up and heat it now to maintain above that for a few weeks?) Not cheap though.
A trowel in the hand is worth a thousand lost under a bush.
Hostafan1
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My concern is that moving about 60 odd agapanthus and sundry other plants in there , it'll be like a banquet for them.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I've left the doors open at night for a few weeks now as it's cooling down and I've gone over everthing with a fine spray on the end of the hose but they've really taken hold.