Suitability of aphidius absinthii Marshall and Trioxys (Binodoxys) communis Gahan (Hymenoptera: Aphidiidae) for the biological control of Pentalonia nigronervosa Coq. (Hemiptera: Aphididae)

Issue Date

10-2008

Abstract

Two parasitoids collected during a survey were tested for their suitability as control agents against Pentalonia nigronervosa Cpq. Aphidius absinthii Marshall and Trioxys (Binodoxys) communis Gahan successfully parasitized P. nigronervosa under laboratory and greenhouse conditions. Under laboratory conditions, the mean value for parasitization efficiency of A. absinthii given a host density of 10 aphids was 1.71 ± 0.95 while that of T. (B.) communis was 2.23 ± 0.08. When the host density was increased to 20 aphids, the mean value for parasitization efficiency increased to 2.19 ± 0.07 for A. absinthii and 3.42 ± 0.12 for T. (B.) communis. In the greenhouse, the mean values for parasitization efficiency were lower for both parasitoids. Parasitization of P. nigronervosa occured, on the average, 9.73 ± 0.33 days after the introduction of both parasitoids in the greenhouse. Under laboratory conditions, parasitization took significantly longer for both parasitoids, 14.14 ± 0.48 days for A. absinthii and 14.1 ± 0.48 for T. (B.) communis. Total developmental periods of the two parasitoids differed under the two experimental conditions. They were longer in the laboratory than in the greenhouse which could be attributed to the limited space and food supply. The parasitoids, having more space and aphids to feed on, developed faster in the greenhouse. However, those in the laboratory lived longer than those reared in the greenhouse.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

22

Issue

2

Page

163-172

Document Type

Article

Frequency

semi-annually

Physical Description

tables; illustrations

Language

English

En – AGROVOC descriptors

PENTALONIA NIGRONERVOSA; HYMENOPTERA: APHIDIDAE; TRIOXYS; PARASITOIDS; BIOLOGICAL CONTROL AGENTS; BIOLOGICAL CONTROL

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