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Auk wrote:

Ozerden wrote: Will moving it outside in a half/shaded place help to kill the insects on it?

I'm not sure why you think that would kill the insects? Most, or, as far as I know, all, insects are used to live outside.

Intense sun radiation, haven't been proved yet. But most prestigious universities in the world are writing thesis about the subject. Go to google scholar and search "A study on the effects of sun: A natural insecticide"

Just kidding. A less humid environment outside might make it less likely for the insects to reproduce? . After killing them with insecticide of course. I don't know, just shooting an arrow. But I've read people say "take the plant outside to reduce indoor insects". I have no idea of the logic behind this statement.

eangola wrote: Intense sun radiation

They'll hide under the leaves.

However... I was wrong:

"There are 3,500 types of cockroaches, and they can be divided roughly into urban types, that live exclusively indoors, and outdoor types, that breed and survive outdoors in tropical regions, but which often move indoors when conditions are favorable"

(still guessing the indoor types will survive outdoors because... cockroaches )

Auk wrote:

eangola wrote: Intense sun radiation

They'll hide under the leaves.

However... I was wrong:

"There are 3,500 types of cockroaches, and they can be divided roughly into urban types, that live exclusively indoors, and outdoor types, that breed and survive outdoors in tropical regions, but which often move indoors when conditions are favorable"

(still guessing the indoor types will survive outdoors because... cockroaches )

I don't think he has roaches though. Roaches are nasty. If my plant brought roaches to my house, I would get rid of the plant, I hate roaches. Luckily I haven't seen 1 roach living in Vermont for the past 6 years, we don't have any here, although some people claim we do, they are quite rare. But moving the plant outdoors will help with the bugs, or at least that's what everyone online says. Indoors is just a great environment for certain bugs to reproduce and thrive.

eangola wrote: I don't think he has roaches though.

:pinch: :dry: :whistle:

eangola wrote: But moving the plant outdoors will help with the bugs, or at least that's what everyone online says. Indoors is just a great environment for certain bugs to reproduce and thrive.

On my trees,, that are outside, or in their soil I find / have found:
Ants,spiders, ladybugs, worms,
Scale / scale bugs, white fly, mealy bugs, wood louse, thrips

On my trees indoors... oh wait, I have no trees indoors. On my plants indoors I have found: nothing...

Can't think of a specific type of insect that would do less good outside - unless when the conditions indoors are very faborable for that specific type of insect.
Fungus gnats maybe, when the soil is kept too wet indoors, but gets the chance to dry outdoors as it gets sun? Any other examples?

The idea is more that outside you find more natural pests, other plantts, wind, rain. All the things which help disperse a pest.

I got the bonsai outdoor and located it into the half shaded area. However, I could not noticed any bugs on it with bare eyes. I think the reason is that they are too small to get noticed. I am planning check it with magnifier. Anyway, what about the insecticide which recommended by other people here. Should I use it also?

only if absolutely necessary, some bugs are cool.

You said you've had the plant for 8 years and recently put it in a larger pot. When you repotted it did you remove most/all of the old soil and use new soil in the new pot? Or did you leave all of the old soil and just fill in the empty spaces in the bigger pot with new soil?
Could it be a matter of soil breakdown and compaction, reducing the ability of water and air to reach the finer roots? Large roots provide structure and stability. Root hairs and tips take up water and nutrients.

When I replaced its pot, I also replaced whole soil with the newer one. I don't think there is something wrong with the soil. Watering may be issue there? I am watering it whenever the soil gets dry. There is no routine. But I might not give enough water?