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I have a weeping willow bonsai. It is in the first potting stage and it has been just thriving. Until a week or so ago it has some kind of a pest that it looks like cobwebs up and down the leaves. I sprayed it with a natural pesticide that I use for some other plants but I think it's too sensitive for that and all the leaves fell off after I did it. Well most of them anyway. How should I treat and what is this pest??

Where are you keeping this plant? If it? is inside that is the problem, could be red spider mite, and that is usually caused by low humidity. spraying for the sake of it is not going to solve the problem. This is not something that has just happened, have you been watering correctly? Without knowing how you keep it and where you are in the world it is not easy to be more specific.

The key to tree health is to prevent pests by correct care, not treating it after it has failed.

That is why there are not so many pest experts in the bonsai hobby. Experienced hobbyists just do not get them. Sure, a few here and there during late part of overwintering, but normally it goes away as soon as the tree goes outdoors in spring.

I guess you are in the nortern hemisphere and now is spring. Your tree (not bonsai) looks like it has been in active growth during winter. Long internodes and week growth. Bear in mind that willows are decidious temperate trees. They need their winter dormancy. Without it they empty their reserves during winter and comes out very weak in spring when they should be strong and growing like crazy.

I would try to remove all that leggy growth. It is not helping the tree nor support any future design. And put it outdoors. If it still have energy left, it will grow again, if not it will die. In any case you have learnt something and saved money on expensive and environmental damaging chemicals that would not make any difference anyway.

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