Efficacy of two plant powders as cowpea grain protectants against <i>Callosobruchus maculatus</i> Fabricius (Coleoptera, Chrysomelideae: Bruchinae)

Abstract

Objective: This study was carried out to study insecticidal effect of powders from Chenopodium ambrosioides leaves and Aframomum melegueta seeds on cowpea weevil Callosobruchus maculatus. Methodology and Results: 5g of both powders of A. melegueta and C. ambrosioides were used in the proportions of C. ambrosioides 100%:A. melegueta 0%, C. ambrosioides 0%: A. melegueta 100%, C. ambrosioides 30%: A. melegueta 70%, C. ambrosioides 70%: A. melegueta 30% and C. ambrosioides 50%: A. melegueta 50%. Plant powders were added to 20g of cowpea grains. Bioassays were conducted at 26.64±0.74°C and 72.55±4.38% relative humidity. Insect mortality was evaluated from 24 to 144 hours after treatment. Results obtained indicated that plant powders had significant effect on C. maculatus mortality. The highest mortality rate (70.00±26.45%) was recorded in jar treated with C. ambrosioides. Conclusion and application of findings: Either plant powders, alone or mixed had high insecticidal effect on C. maculatus. Because of their effectiveness, these plant powders could be recommended as grain protectants against C. maculatus.

Potential of Indigenous Pesticidal Plants in the Control of Field and Post-Harvest Arthropod Pests in Bambara Groundnuts (&lt;i&gt;Vigna subterranea&lt;/i&gt; (L.) Verdc.) in Africa: A Review

“…Various strategies are applied to control bruchids such as cultural control measures, breeding for resistance, synthetic insecticides, and pesticidal plants [52]. The use of pesticidal plants has been reported to be effective control of storage insects it does not cause an undesirable impact on the health of consumers, applicators, and nor-target organisms [27] [33]. Thus, more research is needed to determine the efficacy of pesticidal plants in the control of bruchids in bambara groundnuts.…”

“…The use of pesticidal plants is a promising alternative to synthetic pesticides. Several studies revealed that, the pesticidal plant extracts are effective to control insect pests on crops [27]- [33]. Moreover, pesticidal plants are easily available, degradable in the environment and less toxic to human and non-targeted organisms [28],…”

ACTIVIDAD INSECTICIDA DEL ACEITE ESENCIAL DEL PAICO Chenopodium ambrosioides L. SOBRE Sitophilus zeamais Motschulsky

“…Mortalidad (%) de adultos de S. zeamais alimentados con grano tratado con diferentes concentraciones de aceite esencial de Chenopodium ambrosioides. Chougourou et al (2016), señalan que el polvo de Ch. ambrosioides presenta una mortalidad por contacto entre 69,5 y 100% con concentraciones de 1,0 y 2,0% (p/p), respectivamente.…”

Effectiveness of pesticidal plant extracts on field and post-harvest pests in Bambara groundnuts in Tanzania

“…Various strategies are applied to control bruchids such as cultural control measures, breeding for resistance, synthetic insecticides and pesticidal plants (Ajayi & Lale, 2000). The pesticidal plants powder has been reported to be effective for control of storage insects and does not cause an undesirable impact on the health of consumers, applicators and nor-target organisms (Chikukura et al, 2011;Chougourou et al, 2016). However, there is limited information on the use of pesticidal plants for control of storage insects on bambara groundnuts.…”

“…The use of pesticidal plants is a promising tool for insect pests control hence reducing dependence on synthetic pesticides. Several studies showed that the pesticidal plant extracts are arguably effective control of insect pests on crops (Chikukura et al, 2011;Chougourou et al, 2016;Mkenda et al, 2015a;Mkindi et al, 2017;Mpumi et al, 2016;Stevenson et al, 2017;Tembo et al, 2018). Pesticidal plants are easily available, less costly and degradable in the environment and less toxic to human and non-targeted organisms (Mkenda et al, 2015a).…”