Evaluation of some botanicals for the control of the rice grain bug, Paraeucosmetus pallicornis (Dallas), under laboratory and screenhouse conditions

Issue Date

10-2016

Abstract

Nine botanical extracts: neem leaf, wild sage, lagundi leaf, marigold leaf, ginger rhizome, chili pepper fruits, tobacco leaf, lemon grass, sugar apple and insecticide (check) were evaluated against adult rice grain bug (RGB), Paraeucosmetus pallicornis (Dallas). Bioassays were conducted separately using filter paper and spraying methods under the laboratory and screenhouse conditions to determine the effectiveness of each botanical extract on the RGB. The mortality of RGB using filter paper and spraying methods varied based on three trials conducted. Low mortality of the insects was recorded after three and six days post treatment which ranged from zero to 27% and three to 67%, respectively. The tobacco leaf extract was very effective against RGB adults resulting in 100% mortality after five minutes post treatment, while insecticide caused the same mortality after one hour for both application methods used. On the other hand, spraying method using lemon grass extract caused highest percent mortality (50%) during the 1st trial and sugar apple (70%) in the 2nd trial after three days post treatment. Other botanicals such as neem leaf extract, ginger rhizomes extract, chili pepper fruit extract and lemon grass extract showed more than 50% mortality after six days with 63%, 57%, 63% and 80% in the 1st trial, respectively. In addition, the RGB was affected after one hour exposure to lagundi leaf extract showing 13-17% mortality in the laboratory.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

30

Issue

2

Page

187

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

HETEROPTERA; CYMBOPOGON CITRATUS; ORYZA SATIVA; RICE; AZADIRACHTA INDICA; ANNONA SQUAMOSA; TOBACCO; CHILLIES; SAGE; GINGER; PESTS OF PLANTS; BIOASSAYS; EVALUATION; EXTRACTS

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