Deterrent and insecticidal effects of extracts of pithraj,Aphanamixis polystachya (Meliaceae), againstTribolium castaneum in storage

Abstract

Laboratory experiments were carried out to investigate the efficacy of seed extracts of pithraj,Aphanamixis polystachya (Wall & Parker), a locally grown plant in Bangladesh, against the red flour beetle,Tribolium castaneum (Herbst.). Results of three different bioassays showed that crude extracts of pithraj seeds have strong repellent effects and moderate feeding deterrent and insecticidal (direct-contact) effects on adultTribolium castaneum.

Bioactivity of selected plant powders against Prostephanus truncatus (Coleoptera: Bostrichidae) in stored maize grains

“…The total number of insects that settled on the control and the treated grains was recorded after 1, 12, and 24 h of exposure. Percent repellence (PR) was calculated and interpreted as described by Talukder and Howse (1993) as follows; PR = 2 (C -50)…”

Effect of Medicinal Plant Extracts on the Blood Sugar Trehalose of the Pulse Beetle Callosobruchus Chinensis (Coleoptera: Bruchide)

“…Acetone extracts were prepared according to the method of [17][18][19][20] with modifications. Twenty grams of ground leaves of Vetiveria, Asparagus, Hyptis and Citrus were separately mixed with 200 ml acetone and stirred for 30 minutes using a magnetic stirrer and then left to stand for 24 hours.…”

Bioactive Potentials of <i>Cassia renigera</i> Benth. Extracts against the Stored Product Pests <i>Callosobruchus chinensis</i> L., <i>Sitophilus oryzae</i> L. and <i>Tribolium castaneum</i> (Hbst.)

“…Then ten adult insects were released into the middle of the petri-dish. Insects were counted after 1 h and then at hourly intervals for 5 h. The average of the counts was converted to percentage repellency using the formula: PR = (Nc-5) × 20 Where, Nc was the average hourly observation of insect on the untreated half of the disc [30,31].…”

“…ether extract of leaf was found active against C. chinensis adults through dose mortality assay and the LD 50 values established were 9.270, 4.932, 2.032, 1.721, 1.671, 1.543, 1.513, 1.503 and 1.478 mg cm -2 for 0. 5,6,12,18,24,30, 36, 42 and 48 h of exposure respectively. However, the leaf extracts of CHCl 3 and CH 3 OH; as well as the Pet.…”