It appears that there are at least 2 things going on here: 1 – Your tree is suffering from a lack of nutrients. We suggest that you invest in a fertilizer formulated especially for Citrus and follow the label directions. When a tree is suffering stress from environmental causes (lack of water, lack of nutrients) it weakens the tree and it is not able to fight off insect and disease pests. 2 – This tree is competing with all the weeds for water and nutrients. You might want to weed all the way around the tree and make sure that it is getting full sun and that the soil is well drained. These links might be helpful:
http://www.ipm.ucdavis.edu/PMG/GARDEN/FRUIT/citrus.html
http://www.ipm.ucdavis.edu/PMG/GARDEN/FRUIT/ENVIRON/mineraldef.html
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