Insecticidal Activity of Two Herbal Plant Extracts Against Tribolium Castaneum (Coleoptera: Herbst.)
International Journal of Scientific Research
In continuation of our study for plant origin substances with insecticidal effects, we have screened out root, leaf and stem of C. viscosum against red flour beetle T. castaneum, extracted into ethyl alcohol, ethyl acetate and chloroform. A correlation was found between the insecticidal and repellent activity observed by residual film assay technique and repellency test. It is interesting to note that these plant extracts showed higher to less mortality activity by using 3.93, 1.97, 0.98, 0.49
... nd 0.25 mgcm of doses. The highest degree of 2 toxicity 88% mortality was found using root and stem extracts. The LC values 0.252208 along with 95% 50 confidence limit 0.095135 for stem and LC values 0.2863626 along with 95% confidence limit 0.125406 for root 50 were showed at 72h of observation. The repellent activity was done using ethyl alcohol fraction of C. viscosum. All the extracts showed 100% repellency (Class V category repellency) in dose no 1 to dose no 5 except stem. The degree of repellency response among the three parts of test insect was significantly different (P < 0.05). Class V category repellency was observed for root up to dose 0.06 mgcm (Dose no 7). Whereas, the lowest 2 dose at which the leaf exhibited class V category repellency was at 0.12 mgcm (Dose no 6) and stem showed 2 class V category repellency at the lowest 0.25 mgcm (Dose no 5). The root extract showed strong repellent 2 activity than the leaf and stem. The susceptibility of contact toxicity in intensity of solvents were found ethyl alcohol > ethyl acetate > chloroform fraction. The dose-mortality order of the C. viscosum extracts is root > stem > leaf in comparison with insect to T. Castaneum.