Abstract
Using insect repellent compounds, especially during the warm months, provides comfort for people and preventsspreading of the insect-borne diseases such as dengue fever, malaria and Leishmaniasis. Poisons derived from plants contain alkaloids, glucoside and some essential oils that are taken from plant tissues. They may have repellent and insecticide properties with little toxicity to humans and animals. In this study, Neem plant1 from Bandar Abbas city was used to assess its repellency effect. Therefore, after drying and powdering using maceration method, final Neem extract concentration of 5%, 10% and 20% was provided. Mittler & Dadd methodology was hired to assess this effect. In this method, the antifeedant effect of the Neem plant extract was evaluated on cabbage-feeding aphid (Brevicoryne brassicae). After 24 and 48 hours, the reduced numbers of feces spot of aphids showed that the ingestion of the provided food mixture contained Neem plant extract was significantly decreased. Here it was shown that the Neem plant extract could be used as an efficient repellent.
Highlights
Insects can directly affect the health and comfort of human through the transmission of diseases
The observations of Guerrini et al in 1998 on the flea of dogs and cats showed that the Azadirachtin could create as good protection as a mixture of citronella and Deet
If the insect did not feed, by assuming the same nutritional value for control group, they concluded that it was a repellent compound. The latter was found by our experiment with Neem extract
Summary
Insects can directly affect the health and comfort of human through the transmission of diseases. Azadirachtin with brand name of Nimarin contains oil that is extracted from the seeds and leaves of the tree It is one of the oldest and most popular plant pesticides due to its non-toxic effect to mammals as well as its low sustainability. Anti-nutrition and repellency properties of Neem extract has been evaluated when it was mixed with the insect’s diet and sprayed on plant. Among the Iranian researchers, Urumchi and Laura [9] tested the effect of aqueous extract and three commercial formulations of the Neem on Alfalfa Weevil (Hypera postica) They have seen anti-nutritional, repellent and lethal effects for these compounds. Blaney et al [14] have tested anti-nutritional effects of 40 herbal compounds including Azadirachtin and its derivatives on four species of butterfly. The repellent effect of the Neem grown in southern Iran (Bandarabas) was studied
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