I have recently planted some fruit trees and I bought a dwarf meyer lemon tree. I had tried to start a mango from seed and I noticed the seed was molding. I went to throw it out and I saw tiny spider-like bugs on the seed. I got rid of the seed but my other plants were in the same area as the mango seed. Now my lemon tree has some brown spots on the leaves, and the leaves are falling off. When I inspected the plant it looked fine, but the bottom part of the pot had a couple white tiny spiders crawling on it. I took a piece of cardboard and knocked it against the tree. Nothing fell off, no black specs or spider. I have also been able to see one skinny long bug (still pretty tiny though)with quite a few legs. I have not seen any webbing anywhere or anything on the leaves just some bugs in the soil. Will soap and water take care of this problem?