Title page for ETD etd-71997-85230


Type of Document Master's Thesis
Author McDonald, Sharon Angella
Author's Email Address shmcdona@vt.edu
URN etd-71997-85230
Title Infestation Patterns of the Coconut Mite, Eriophyes guerreronis (Keifer) (Acari: Eriophyidae), on Coconuts and Resulting Yield Loss in Eastern Jamaica
Degree Master of Science
Department Entomology
Advisory Committee
Advisor Name Title
Fell, Richard D.
Pfeiffer, Douglas G.
Ravlin, Forrest W. Committee Chair
Keywords
  • coconut
  • Eriophyes guerreronis
  • Eriophyidae
  • infestation
  • yield loss
Date of Defense 1997-07-09
Availability unrestricted
Abstract
Coconut mite populations and levels of damage to 2-, 4- and 10-month old Maypan and Red Malayan Dwarf nuts in Low and High Rainfall Zones of eastern Jamaica were evaluated. Damage due to the coconut mite was assessed by quantifying scarring of the nut surface, size reduction and copra yield. It was found that coconut mite populations were the same in the two rainfall zones but differed between Maypan and Red Malayan Dwarf varieties. More Maypan nuts were infested with coconut mites than Red Malayan Dwarf nuts. More 2-month old Red Malayan Dwarf nuts were attacked than 2-month old Maypan nuts while more 10-month old Maypan nuts were colonized than 10-month old Red Malayan Dwarf nuts. In both varieties, a greater percentage of 4-month old nuts had > 1,000 coconut mites than 2- and 10-month old nuts.

Nuts in the Low Rainfall Zone had greater percentage of coconut mite damage than nuts in the High Rainfall Zone. Damage was more severe on Red Malayan Dwarf than on the Maypan nuts. The water content of Red Malayan Dwarf nuts declined with increased coconut mite damage but no relationship was found between the water content of Maypan nuts and coconut mite damage. Nut size and copra yield declined significantly with increased coconut mite damage. Total copra yield loss was only about 3% in Maypan and 6% in Red Malayan Dwarf nuts because most of the nuts had < 30% surface area damage.

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