To find the alternate ones
with insecticides of synthesis, the extracts of plants are more and more used
by the peasants to protect stocks from harvest against the devastating insects.
Small fireclay cups phytochimic and insecticidal are made on three plants (Crataeva religiosa, Ficus thonningii and Tapinanthus bangwensis). The
identification of the active ingredients present in the three plants show that
they contain polyphenols, flavonoides, alkaloids, tannins, saponosides, etc. The
insecticidal tests showed that the extract with the chloroform (HEY) of Crataeva religiosa is effective on Callosobruchus maculatus and Sitophilus zeamais while extracts with
cyclohexan (EC) and methanolic (EM) are effective only on Callosobruchus maculatus. It sucked shown that the extract with
chloroform gives a better mortality rate and that Callosobruchus maculatus is more sensitive to the treatments the
strong amount (50 mg/mL). For the study of emergences, the methanolic extract
of the sheets of Crataeva religiosa ensures a better protection of the medium on Sitophilus zeamais. It was also shown that the extracts with the
cyclohexane and methanolic of Ficus
thonnigii are more effective on Callosobruchus
maculatus. Thus, the methanolic extract (EM) of Ficus thonningii reduces considerably the number of insects emerged
in the short run on Callosobruchus
maculatus. The tests relating to Tapinanthus
bangwensis showed that the extracts cyclohexanic, chloroformic and
methanolic are effective on Sitophilus
zeamais. The extracts with the cyclohexan and the methanol of Tapinanthus bangwensis reduce considerably
the number of insects emerged on Sitophilus
zeamais and long-term. Broadly Tapinanthus
bangwensis is more effective on the two studied insects and Callosobruchus maculatus is the
species most sensitive to the treatments. It is thus the most promising plant.
Cite this paper
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