Pathogenicity of heterorhabditis indica Poinar et al. PBCB strain on mango fruitfly, bactrocera philippinensis Drew & Hancock (Diptera: Tephritidae)

Issue Date

10-2017

Abstract

Heterorhabditis indica Poinar et al. is one of the most common entomopathogenic nematodes used to manage soil-borne insect pests. In this study, the pathogenicity of the Philippine H. indica PBCB strain was evaluated in the laboratory at different infective juvenile (IJ) concentrations (0, 4, 8, 16, 32, 64, 128) on mango fruitfly, Bactrocera philippinensis Drew & Hancock. Results showed that at 128 IJs, H. indica could cause 82.22% and 88.89% mortality after 24 and 48 hours post infection (HPI), respectively. There is a strong positive linear between H. indica concentration and B. philippinensis mortality (ƿ=0.83 (24-hrs) and ƿ=0.78 (48-hrs)). On the other hand, LC50 was 52.68 IJs and 32.01 IJs at 24 and 48-HPI, respectively. Some treated larva exhibited pink-red coloration, a typical sign of Heterhabditis infection. Also, there is a strong negative linear association between H. indica concentration and B. philippinensis emergence (ƿ= -0.77). This study proved that H. indica is indeed a promising biological control agent against B. phillipinensis.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

31

Issue

2

Page

169

Document Type

Article

College

College of Agriculture and Food Science (CAFS)

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

MANGOES; BACTROCERA; TEPHRITIDAE; HETERORHABDITIS; FRUIT DAMAGING INSECTS; PEST OF PLANTS; PEST INSECTS; ENTOMOPHILIC NEMATODES; PATHOGENICITY; BIOLOGICAL CONTROL AGENTS

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