there is a pest attacking my lychee tree and i do not know what it is. this pest is very small and is very white and cottony, i try to scrape all of it off my tree's leaves and branches every day but the cotton balls always come back. also when i scrape them off, they seem to mash together like mold does. there are also little webs on my tree that i can barely see. the tree's leaves are also sticky. this pest seems to be damaging the new growth on my tree. i tried using a pesticide to get rid of it but it did not work. my tree is dying slowly too because its leaves have burnt tips even though i water it enough, the burnt tips keep climbing up the leaves. can you help me try to identify this pest so i can kill it? pictures below, click to enlarge.