Preventative spraying of fungicides is recommended from whenever the temperature inside gets above 10 degrees. Moist conditions, stale, stationary air and higher temperatures = fungal heaven. I sprayed the tops with Pyrethrin and did the roots with Provado, so next time I see the trees, they should be ok.įungal issues are also a major, major concern for polytunnel users. I have some and some ahem.slightly err.older chemicals stockpiled, so I can kill them. Pyrethrin is your best bet in the UK, although it is unstable in sunlight and high temperatures so be careful in storing it and also the time of day you spray it. Most trees will benefit from it, although there are some which are much less likely to be affected by insects.Ĭuring trees with infestations is more difficult, as contact killers are less available. A trusted source (Ken Leaver, nurseryman extraordinaire) assures me it is good all year round. This should prove effective for 6 to 8 weeks, which will see you through the spring period when aphids et al. If this is impossible then make up a watering can full, or a sprayer or whatever and carefully drench the soil.

The most effective way of using Provado is to dunk your trees, pot and all into a bath of diluted Provado and allow the soil to absorb it, subsequently the roots will suck it up and we are all systems go. So, how do we get this into the system? Spraying on the leaves won't work because there aren't any.so we must use a root drench. Any critters who start to suck sap, take a dose of poison with it and then shuffle off this mortal coil. It is a systemic pesticide, which means it gets into the system of the tree and works from the inside out.

Prevention is better than cure, especially as we are hamstrung by Defra in terms of effective chemicals over the counter, so Provado is your best friend. Insects will wake up early and fungal spores can spread like wildfire. One of the problems with using such a contraption and creating an unnatural micro climate and then cramming trees in there is that problems can and will arise. For those in warm climates who don't need one.aren't you lucky. Using a polytunnel or green house is fast becoming an essential part of bonsai in the UK and for many of youze lot around the globe. After rubbing my eyes to make sure I wasn't seeing stuff, I went to bed for a few hours before coming down to sort them out. I could barely believe my eyes, 0.3 degrees and aphids all over my tender shoots.

Blob opera into the thick of it