Bioactivity of three crude plant extracts against maize weevil complex, Sitophilus spp. (Coleoptera: Curculionidae) and bean beetle, Callosobruchus chinensis (L.). (Coleoptera: Bruchidae)

Creator

Win Myint Thein, University of the Philippines Los Banos
Pio A. Javier, University of the Philippines Los Banos
Flor A. Ceballo, University of the Philippines Los Banos

Issue Date

10-2013

Abstract

The crude extracts from three plant species (citronella Cymbopogon nardus; langkauas Alpinia pyramidata; and patchouli Pogostemon cablin) were prepared using acetone and evaluated for repellency and contact toxicity against adult maize weevil Sitophilus spp. and bean Callosobruchus chinensis (L.). The most active crude extract was selected and formulated as emulsifiable concentrate and further evaluated for admixture grain treatment against Sitophilus spp. C. chinensis. All the three cruse extracts provided high repellancy level but langkauas provided 100% reduction in F¹ emergence of both Sitophilus spp. and C. chinensis. None of the crude extracts from the three test plants showed considerable contact toxicity against Sitophilus spp. but langkauas crude extract showed the highest toxicity against C. chinensis. Consequently, langkauas crude extract was formulated as emulsifiable concentrate for admixture treatment. The grain admixture treatment at the rate of 7.5% langkawas (w/w) crude extract caused 83% mortality of Sitophilus spp. in 7 days and provided 100% reduction in F¹ emergence. Likewise, the admixture treatment at the rate of 2% caused 99% mortality of C. chinensis in 4 days and provided 94% reduction in F¹ emergence. Among the test plants evaluated, langkauas generally was the most effective against Sitophilus spp. and C. chinensis, providing the highest reduction in F¹ adult emergence in the repellency test and admixture grain treatment and exerted the highest contact toxicity, having the lowest LD₅₀ values. Between the two coleopteran test insects, Callosobruchus was more sensitive to the crude extracts of langkauas than Sitophilus spp.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

27

Issue

2

Page

208

Document Type

Article

Frequency

semi-annually

Language

English

Recommended Citation

Thein, Win Myint; Javier, Pio A.; and Ceballo, Flor A., "Bioactivity of three crude plant extracts against maize weevil complex, Sitophilus spp. (Coleoptera: Curculionidae) and bean beetle, Callosobruchus chinensis (L.). (Coleoptera: Bruchidae)" (2013). Journal Article. 4817.
https://www.ukdr.uplb.edu.ph/journal-articles/4817

En – AGROVOC descriptors

SITOPHILUS; CALLOSOBRUCHUS CHINENSIS; CURCULIONIDAE; PLANT EXTRACTS; PEST REPELLENTS; PEST CONTROL