what are some tell tale signs of nute burn and def. they say during burn the leaves may curl under themselves? what if there are white dots (not spider mite caused)? does grayish mold looking stuff that forms on the edge of the leaf that obviously isnt mold caused by too many nutes? what are some other signs of def. other than fading color? i am having nute probllems that arent fitting the faw problems descriptions. please help!