Studies on the Seasme Webworn Antigastra Catalaunalis Dup (Lepidoptera: Pyralidae).

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Abdin Mohamed Zein El Abdin, Zein El Abdin
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The sesame webworm Antigastra catalaunalis Dup. (Lipdoptera: Pyralidae), is a major pest of sesame in the Sudan. A study of the external morphology, biology and the differential susceptibility of some sesame varieties to the attack of the pest was carried out. The morphological features of the adult moth by which the two sexes could be separated were given. The development of the egg, larval and pupal stages under laboratory conditions lasted for 2.09, 4.49 and 4.00 days respectively. The pest appeared suddenly in large numbers after the first showers of rains and thus caused considerable damage to the sesame crop. Sesame (Sesamum orientale) is the main host plant of the pest in Shambat area. In the laboratory, the pest was successfully reared on the ornamental plant Antirrhinum majus. A study of the morphology, biology and rate of parasitization of the indigenous parasite Bracon Hebetor Say was made. It was the most important of the parasite complex of Antigastra larvae in Shambat area and under natural conditions it could inflict a maximum of 18 per cent parasitization. The damage was more and severe on hairy varieties and the early maturing ones recorded a high pest population at the time of flowering. There was a positive correlation between the pest infestation and the number of branches per plant.
Studies on the Seasme Webworn Antigastra Catalaunalis Dup (Lepidoptera: Pyralidae).