Date of Publication

10-1994

Document Type

Master's Thesis

Degree Name

Master of Science in Biology

Subject Categories

Biology

College

College of Science

Department/Unit

Biology

Thesis Adviser

Corazon C. Sinha

Defense Panel Chair

Josefina de Jesus

Defense Panel Member

Salvador Escueta
Imelda Pagulayan

Abstract/Summary

Freeze dried and oven dried nami extracts of nami tuber (Discorea hispida Dennst.) in the series of 7g/l, 6g/l, 5g/l, 3g/l, 2g/l concentrations are used to find out their effect on the mortality of golden apple snails at six different age levels, namely: 0 week, 1 week, 2 weeks, 3 weeks, 4 weeks and 8 weeks. Observed responses of treated golden apple snails include avoidance reactions, mucus secretions and mortalities. Analysis of the mortality data after a 24-hour toxicity test showed that the levels of concentration of nami extract significantly affect the mortality of golden apple snails. It was found that the higher the concentration of nami extract, the higher is the percent mortality. However, various age groups of golden apple snails did not show any significant difference in their avoidance reaction to nami extract. There was also no significant difference observed between freeze-dried and oven-dried nami extracts in terms of their effects on snail mortality. Furthermore, no significant interaction was observed in the form of preparation and concentration of nami extract and also on form of preparation of nami extract and age of the golden apple snails. However, LC 50 at 4.26g/l nami extract regardless of form of preparation was obtained in the experiment. It is concluded that nami extract can be a potential botanical molluscicide against golden apple snail.

Abstract Format

html

Language

English

Format

Electronic

Accession Number

TG02572

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

68 leaves

Keywords

Plants; Insecticidal; Pest control; Snails; Pesticidal plants; Extracts; Pomacea canaliculata

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