University of Khartoum

Survey, Morphometric Differences and Level of Infestation of Pachnoda interrupta (Oliver) (Coleoptera: Scarabaeidae) in Gedarif and Khartoum States

Survey, Morphometric Differences and Level of Infestation of Pachnoda interrupta (Oliver) (Coleoptera: Scarabaeidae) in Gedarif and Khartoum States

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Title: Survey, Morphometric Differences and Level of Infestation of Pachnoda interrupta (Oliver) (Coleoptera: Scarabaeidae) in Gedarif and Khartoum States
Author: Osman, Samaher Emame Mohemed
Abstract: This study was conducted during the period September-October 2016 in Gedarif State and Khartoum State (Faculty of Agriculture, University of Khartoum). The study aimed to estimate the level of infestation and percent of infestation caused by the sorghum chafer (Pachnoda interrupta) (Coleoptera: Scarabaeidae) on sorghum and sunflower crops in Gedarif State. The study aimed to detect whether the insect found in Khartoum is similar to that in Gedarif State. A field survey was conducted in Gedarif State in four localities (University of Gedarif, AL Azaza Sogora, Pasonda and Algadambalia). In each locality two (sunflower and sorghum) farms were inspected, except at the University of Gedarif, only sunflower was inspected, no sorghum was grown. Observations on the selected farms were made on 60 randomly selected plants (10 footsteps from plant to plant) using cross diagonal method in Gedarif State. Adults of Pachnoda interrupta were collected from infested plants and taken to the laboratory at the Faculty of Agriculture, University of Khartoum. Specimens of sorghum chafer which were collected from both study sites were subjected to morphometric microscopic examinations at the laboratory of the Department of Crop Protection, Faculty of Agriculture, University of Khartoum. Data obtained from the field survey were subjected to descriptive statistics. The level of infestation and percent of infested heads were calculated for data obtained from the field survey. The data collected from the morphometric measurements were analysed using T-Student Test. Least Significant Difference (LSD) was used for mean separation. Correlation coefficient was calculated for the measurements of the different parts of the insect body. P. interrupta was not found in sunflower and sorghum farms at Pasonda and Algadambalia localities. In sunflower grown at the University of Gedarif a level of infestation of 0.37 and a percent of infestation of 17.7% were recorded. In a sunflower farm, in Al Azaza Sogora locality a 6.31level of infestation and a 91.9% percent of infestation were recorded. In sorghum, however, a level of infestation of 2.19, and a percent of infestation of 53.2% were detected. Observations of the collected beetles revealed that the adult is black with reddish-brown margins and a number of spots and stripes of the same color. The beetles have lamellate antennae, black legs with 5 tarsal segments and 2 claws; the hind wings are black transparent. Specimens of beetles collected from Gedarif State are not different from those collected from Khartoum State in terms of the measurement of body (17.8mm), head (3mm), antennae (2mm), thorax (6.8mm), hind wings (17.7mm), hind legs (12.6mm) and abdomen (8.0mm). Length of forewings (11.9mm), forelegs (9.4mm)and mid legs (12.5mm) of specimens collected from Khartoum State were significantly higher than the respective parts of specimens collected from Gedarif State (9.2mm, 7.8mm, 9.9mm, respectively). Correlation coefficient between different pair-wise parts of the insect body collected from the two sites of the study revealed that, the percent of the difference was 87.5%, This indicates that the specimens of the sorghum chafer which were collected from Gedarif State seem to be different from those which were collected from Khartoum State. The results recommend further studies, especially at the DNA level to confirm these findings.
URI: http://khartoumspace.uofk.edu/123456789/27059


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