Botanical biocides. 13. Rearing of the cigarette beetle, lasioderma serricorne (f.)‎, on different natural media and testing efficacy of certain plant extracts and insecticides

الملخص EN

This study was undertaken to investigate the rearing of cigarette beetle, Lasioderma serricorne (F.) on different food media and to test the efficacy of certain plant extracts and insecticides by filter paper diffusion method.

Eleven plant materials were tested as food media to the concerned insect.

The insect did not complete its life cycle on three of them: black pepper (Piper nigrum L.), fenugreek (Trigonella feonum graceum L.) and fennel (Foeniculum vulgare L.), thus their extracts were tested as toxicants to the studied insect.

The results revealed that the suitability of the eight tested types of foods, regarding the ability of the insect to survive and complete its life cycle as well as to propagate, could be arranged in the following descending order: coarse wheat bran > capsicum > dried Jew’s mallow > lupine powder > dried onion > dried coriander = corn flakes > hard paste (sheiria).

The toxicity results of the ethanolic extracts of the three plants against both adult and larvae of L.

serricorne revealed that the most effective plant extract was black pepper followed by fenugreek then fennel.

For the tested insecticides, the toxicity might be arranged in the following descending order: methomyl > deltamethrin > malathion.

Compared to the black pepper extract as a standard at the larvicidal LC50, the relative potency was 18.0 and 2.61 % for fenugreek and fennel, respectively.

Based on methomyl as a standard at larvicidal LC50, the relative potency was 0.05 and 0.06 % for deltamethrin and malathion, respectively.