why America get red ring
Answers
Explanation:
Bursaphelenchus cocophilus nematodes infect palm trees and cause the red ring disease that is fatal to palm, coconut and other fruit trees. Chlorosis (leaf discoloration) first appears at the tips of the oldest leaves and spreads towards their bases .The brown lower leaves may break across the petiole of the lower part of the rachis, or they may become partly dislodged at the base and hang down. Nuts are shed prematurely, either simultaneously with the development of leaf symptoms, or slightly before. About 4-6 weeks after symptoms first appear the crown often topples over from the internal damage caused by the palm weevil larvae; but, the trunk remains standing in the field for several months until it decays. However, the outward yellow appearance of the nematode infection is sometimes indistinguishable from those of trees growing under conditions of poor drainage or during intense drought
The name Red Ring Disease comes from the internal lesions these nematodes cause and they appear as an orange to brick-red colored ring, 2-4 cm wide, and at a distance of 3-5 cm from the periphery. In longitudinal section, the reddened tissue may appear as two united bands joined in the bole forming a U-shape or full circle.