The antifeedant potential of longan (dimocarpus longan) seeds against coconut leaf beetle (brontispa longissima gestro) / Mark Joseph I. Lopez. 6

By: Mark Joseph I. Lopez. 4 0 16, [, ] | [, ] |
Contributor(s): 5 6 [] |
Language: Unknown language code Summary language: Unknown language code Original language: Unknown language code Series: ; March 2007.46Edition: Description: 28 cm. 46 ppContent type: text Media type: unmediated Carrier type: volumeISBN: ISSN: 2Other title: 6 []Uniform titles: | | Related works: 1 40 6 []Subject(s): -- 2 -- 0 -- -- | -- 2 -- 0 -- 6 -- | 2 0 -- | -- -- 20 -- | | -- -- -- -- 20 -- | -- -- -- 20 -- --Genre/Form: -- 2 -- Additional physical formats: DDC classification: | LOC classification: | | 2Other classification:
Contents:
Action note: In: Summary: ABSTRACT: The study dealt on the portential of Longan (Dimocarpus longan) seeds to inhibit the feeding habit of coconut leaf beetle (brontispa longissima) indicated by two parameters; mortality and the repellency (insect food preference). The Longan fruits were obtained from Divisoria, Manila while the coconut leaf beetle was collected at Roxasn Boulevard, Manila and at Langakaan, Cavite. The study was conducted inside the laboratory using two sets of procedures, the Leaf dip Assay (Evaluation of insects mortality) and Non-choice test (Leaf disc Assay) from October to December. In the first part of the study, the test organisms were fed with coconut leaves incorporated with extract of Dimocarpus longan seeds of varying concentrations (25%, 50%, 75% and 100%) and the mortality was accounted every 12 hours for one week. Using ANOVA the most effective concentration was determined on both larvae and adult stages to recognize its potential usage on population repression of coconut leaf beetle in coconut farm. On the second part, two leaf fronds of treated and control diet was placed on the opposite sides of the plate and the insects were given the chance to choose on which coconut leaf they will feed. Using Chi-square analysis, the food preference of the insects was determined according to the observed results tallied for 48 hours of observation. The evaluation of larval mortality using 100% concentration yielded the highest mortality rate during the seven-days exposure. The 75% concentration was found to be the most effective concentration against the adult Brontispa longissima. It was also observed that the length of exposure has direct proportionality on the mortality of the insects. The effectiveness of the longan seed extracts was greater in adults than in larvae. With regards to insect food preference, it was found out that 100% concentration was the most effective insect repellant type of antifeedant on both larvae and adult Brontispa longissima. Similarly, the effectiveness of the substance was more promising on adult Brontispa longissima than in larvae. As a whole, longan seed extract inhibited the normal feeding of the insects due to the tannins, saponins and phenolic compounds. Other editions:
Tags from this library: No tags from this library for this title. Log in to add tags.
    Average rating: 0.0 (0 votes)

Thesis: (B.S. Biology)-Pamantasan ng Lungsod ng Maynila, 2007. 56

5

ABSTRACT: The study dealt on the portential of Longan (Dimocarpus longan) seeds to inhibit the feeding habit of coconut leaf beetle (brontispa longissima) indicated by two parameters; mortality and the repellency (insect food preference). The Longan fruits were obtained from Divisoria, Manila while the coconut leaf beetle was collected at Roxasn Boulevard, Manila and at Langakaan, Cavite. The study was conducted inside the laboratory using two sets of procedures, the Leaf dip Assay (Evaluation of insects mortality) and Non-choice test (Leaf disc Assay) from October to December. In the first part of the study, the test organisms were fed with coconut leaves incorporated with extract of Dimocarpus longan seeds of varying concentrations (25%, 50%, 75% and 100%) and the mortality was accounted every 12 hours for one week. Using ANOVA the most effective concentration was determined on both larvae and adult stages to recognize its potential usage on population repression of coconut leaf beetle in coconut farm. On the second part, two leaf fronds of treated and control diet was placed on the opposite sides of the plate and the insects were given the chance to choose on which coconut leaf they will feed. Using Chi-square analysis, the food preference of the insects was determined according to the observed results tallied for 48 hours of observation. The evaluation of larval mortality using 100% concentration yielded the highest mortality rate during the seven-days exposure. The 75% concentration was found to be the most effective concentration against the adult Brontispa longissima. It was also observed that the length of exposure has direct proportionality on the mortality of the insects. The effectiveness of the longan seed extracts was greater in adults than in larvae. With regards to insect food preference, it was found out that 100% concentration was the most effective insect repellant type of antifeedant on both larvae and adult Brontispa longissima. Similarly, the effectiveness of the substance was more promising on adult Brontispa longissima than in larvae. As a whole, longan seed extract inhibited the normal feeding of the insects due to the tannins, saponins and phenolic compounds.

5

There are no comments for this item.

to post a comment.

© Copyright 2024 Phoenix Library Management System - Pinnacle Technologies, Inc. All Rights Reserved.