The first symptom is the chlorosis of one leaf, usually on the second or third flush behind the tip. The chlorosis may begin at either the tip or base of the leaf and the pattern is often very distinctive, with islets of tissue remaining green as the rest of the lamina turns yellow (this pattern is less apparent in Malaysia than in Papua New Guinea). Within 2 or 3 days the chlorotic leaf is shed and, subsequently, leaves above and below it turn chlorotic in the same way and are also shed, resulting in a distinctive situation where the youngest and oldest leaves are still present while all the middle leav... [more]