University of Khartoum

Studies on diurnal activity, feeding preference and susceptibility of the dura andat Agonoscelis pubescens (Thunb.)(Hemiptera: Pentatomidae) to Metarhizium anisopliae (Metsch.)

Studies on diurnal activity, feeding preference and susceptibility of the dura andat Agonoscelis pubescens (Thunb.)(Hemiptera: Pentatomidae) to Metarhizium anisopliae (Metsch.)

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Title: Studies on diurnal activity, feeding preference and susceptibility of the dura andat Agonoscelis pubescens (Thunb.)(Hemiptera: Pentatomidae) to Metarhizium anisopliae (Metsch.)
Author: Adam, Abdelsami Musa Ibrahim
Abstract: The Sorghum bug is considered one of the most important sorghum pests. The pest has the potentiality to infest all sorghum varieties during the milky stage. Considerable damage in the rain-fed and irrigated sectors is annually expected. The current study, which was carried out during season 2003-2004 investigated the feeding preference of the pest at Babangeel (South Kordofan State). Three varieties of sorghum (Tabat, Wad Ahmed and Arfaa Gadamak) were widely sown in the State ( the area of study ). Every three days 30 heads for each cultivar were randomly chosen and the insects found in each head were counted. Diurnal activities (feeding, wandering and hiding) of the pest during the day (morning, mid-day and after-noon) were recorded in each head in two varieties (Tabat and Wad Ahmed). Results showed that the sorghum bug preferred the variety Tabat more than the other two varieties ( Wad Ahmed and Arfaa Gadamak). Results also showed that the sorghum bug fed during the early morning and after-noon before sunset. The pest was found hiding in the head of the dura during mid-day. Wandering activities were recorded in the morning hours. The biological control of the pest was investigated in the laboratory and in the field at Assalaya (White Nile State) using the fungus Metarhizium anisopliae. The pest was treated by Micro-ULVA sprayer with three different concentrations (0.25 gm of spores suspended in 100 ml of gasoline, 0.5 gm of spores suspended in 100 ml of gasoline and 1 gm of spores suspended in 100 ml of gasoline). As regards the laboratory studies twenty insects were treated with the respective concentrations. Each treatment was replicated three times. In all cases untreated insects served as control. After treatment the mortality counts were taken every three days, and continued for eighteen days after the date of application. Results showed that the pest responded to the effect of the fungus at the different concentrations. Mortality percentage increased as the concentration of spores increased. The spores of the fungus were affected negatively by the environmental factors such as temperature, relative humidity and wind speed. The study revealed that the initial disease symptoms appeared after 72 hours from application of the spores.
Description: May 2005
URI: http://khartoumspace.uofk.edu/handle/123456789/11004
Date: 2015-05-18


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