Preliminary assessment of within-and among- population variabilities in host preference of local populations of the rusty plum aphid Hysteronuera setariae (Thomas).

Date

5-1996

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

The host preference of local populations of the rusty plum aphid {Hysteroneura setariae (Thomas)}, a phytophagous dry season pest of rice and a recorded vector of sugarcane mosaic, cucumber mosaic, and onion yellow dwarf viruses, was determined through host choice bioassay on 10-in. diameter disposable petri dishes lined with moist filter paper. Five colonies of aphids taken from Oryza saliva (IR62), 5 colonies from Digitaria ciliaris, and 4 colonies from Chloris barbala were made to choose between slivers of D. ciliaris, Dactylociaenium aegyptium, C. barbala, Eleusine indica, Oryza minula, and IR62. Marked differences in terms of host preference both within colonies from the same host plant and between insects from different host plants were observed. Despite the fact that the colonies all belonged to the same species, they exhibited variability in host preference revealing wide host range or polyphagy in H. setariae. Moreover, it may suggest a fine-grained environmental variation for the insects. Results are meant to be heuristic and are a small part of the actual assessment of within and among population variability in H. setariae populations.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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