Host utilization pattern of Scirtothrips dorsalis Hood (Thysanoptera: Thripidae) in a mango orchard in East Java, Indonesia

Date

6-2017

Abstract

Scirtothrips dorsalis is known as polyphagous insect. its host plant utilization pattern was studied in mango agroecosystem to determine the relationship of the population found on mango to the population found on other weeds. The population of thrips was monitored year-long. The research was conducted in a mango plantation in Situbondo, East Java, Indonesia. The seasonal abundance was studied in mango and weeds under the canopy of mango. Laboratory studies were done to determine preference of S. dorsalis to phenological stages of mango including host plant suitability and survivorship that were done on several mango growth stages and selected weeds from which possible host utilization pattern could be explained. The research showed that the population dynamics of S. dorsalis in mango was not related to that observed in the weeds but more related to the agricultural practices and rainfall pattern. Younger age structure was found associate with high input block than in low input, however, the reverse was found in weeds and female was dominated in sex ratio. There was an influx of S. dorsalis from all directions during as early as bud break up to fully expanded leaves or up to fully opened flowers, however, the sources of thrips moving into the mango could not be ascertained. Laboratory observation found that S. dorsalis preferred flushes to flower and dormant leaves. Weeds L. leucochephala, I. triloba, Ac. indica, D. leptophyllus and Az. indica were supported the development of S. dorsalis nevertheless, Ac. indica was the most suitable host among the weed species tested and given the highest rate of survivorship. Weeds T. procumbens, M. pudica and M. charantia were found harbor the thrips but they unable to provide life cycle of S. dorsalis in the laboratory. Further research on host utilization pattern of S. doralis on mango under different agricultural practices and agroclimate, It movements in mango orchard to ascertain the migration from weed to mango and vise versa including preference study between mango and weeds are still needed to completely determine the host utilization pattern of S. dorsalis in mango agroecosystem.

Document Type

Dissertation

Degree

Doctor of Philosophy in Entomology

Adviser/Committee Chair

Celia dR. Medina, Ph.D.

Committee Member

Luis Rey I. Velasco, Pio A. Javier, Dinah Pura T. Depositario

Language

English

LC Subject

Agricultural pests, Thrips (Insect) -- Indonesia, Weeds -- Indonesia, Insects

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 996 2017 E75 A34

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