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The influence of powdered fruits of Foeniculum capillaceum Gilib. on the fecundity of Sitophilus oryzae was examined. The powder was added in paper bags to the rearing of the insects to prevent a direct contact. The significant reduction of the fecundity of females was recorded. The sequent effect of activity of the powder was also observed. It resulted in the decrease of the fecundity of offspring generation - F2 reared on wheat gains without the powder.
Studies were carried out in the laboratory to determine the efficacy of powders from plant parts of Ricinodendron heudelotii against the storage pests Sitophilus zeamais and Callosobruchus maculatus on stored maize and cowpea, respectively. Leaf, bark and root powders were added as admixtures to 100 g of grains to assess contact toxicity, damage assessment, progeny production and grain germination. Results indicated that the plant materials were toxic to the two insect species with over 30% and 75% mortality for S. zeamais and C. maculatus, respectively. Observable damage level was significantly (p ≤ 0.05) lower in treated grains while progeny production by both insect species was significantly (p ≤ 0.05) reduced. Grain germination of both crops was not affected by the powders. The potential use of P. heudelotii in storage pest management is discussed.
The aim of this work has been to determine the characteristics of seven natural peptide substances. The chemical formulas of the substances were as follows: HCL-TrypNH2, AC-Ach-OH, Perm(C-7)-α-Ala-AN, Boc-Ala-AN, H-Tyr(O-C10-H21)OH, C6H5-CH2S-C-Phe, C-t-Per-An. ǁ O The experiment was executed on five species of storage pests: Tribolium confusum Duv., Stiphilus granarius L., Stegobium paniceum L., Trogoderma granariwn Ev., Rhizoperlha dominica F. The experiment consisted of two parts. In the first part, the deterrent effect of the peptide substances was assessed by saturating the food (wheat wafers) to 1% concentration of each substance. The second part involved testing the effect of the substances on mortality of pests. The development of insects was screened for 30 days. The deterrent effect of the substances applied varied and was dependent on a species of pests. It was found out that substances of II and III deterrence class were effective in protecting stored products from Tribolium confusum and Sitophilus granarius. All the substances tested in the course of our study can be applied against Stegobium paniceum. The other two pests were neither deterred nor was their mortality affected by any of the peptide substances examined.
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