University of Khartoum

Life Cycle Of The Khapra Beetle Trogoderma Granarium (Everts.) (Coleoptera: Dermistidae) Reared On Some Cereal Crops And Their Relative Susceptibility To The Insect’s Attack

Life Cycle Of The Khapra Beetle Trogoderma Granarium (Everts.) (Coleoptera: Dermistidae) Reared On Some Cereal Crops And Their Relative Susceptibility To The Insect’s Attack

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Title: Life Cycle Of The Khapra Beetle Trogoderma Granarium (Everts.) (Coleoptera: Dermistidae) Reared On Some Cereal Crops And Their Relative Susceptibility To The Insect’s Attack
Author: Saliheen, Khogali Mahmoud Khogali
Abstract: Experiments were carried out at the Crop Protection Department laboratory of the Faculty of Agriculture, University of Khartoum. The study aimed to investigate the biology of the khapra beetle Trogoderma granarium (Everts.) reared on cereal grains, sorghum millet and wheat. The relative susceptibility of these grains to the insect attack was also included. Results obtained revealed that the female deposited 47.9, 37.1 and 38 eggs in sorghum, millet and wheat in average, respectively. The incubation period of the eggs ranged between 5-8 days with an average of 6.44 ± 0.71 days. The beetle passed through five larval instars. The larval durations were (44 ± 5.9 days) for sorghum, (41.7 ± 10.0 days) for millet and (39.5 ± 7.5 days) for wheat respectively. Some larvae were found interring in diapause. From the pupal to the adult stage, the duration was 6.17 ± 0.4 days. The whole life cycle from egg to the adult varied according to the grain variety. In sorghum it was (43-57 days) with an average of (50 ± 5.9 days), in millet it was (40-56 days) with an average of (47.8 ± 9.8 days) and in wheat it was (41-58 days) with an average of (48.5 ± 7.3 days) respectively. The adult female lived for 10.3 ± 0.8 days while the adult male lived for 11.5 ± 1 days on average. The average measurement of the egg was 0.7 mm, and the average measurement of the larval instars were 1.06 mm for the 1st instar, 2.5 mm for the 2nd instar, 3.4 mm for the 3rd instar, 4.4 mm for the 4th instar and 5.02 mm for 5th instar. As for the pupa the average measurement was 3.8 mm and 5.03 mm for the male and the female respectively. The varied susceptibility results showed that the percentage of weight loss was (1.48%) in sorghum, (1.34%) in millet and (1.07%) in wheat respectively. The percentage of attacked seeds (damaged seed) were (26.85%), (22.73%) and (20.89%) for wheat, sorghum and millet respectively. As for the grain dust wheat came the least (0.55%) followed by millet (0.59%) and sorghum was (0.60%). The percentage of weight loss, damaged seeds and grain dust increased with increase in the storage periods. The germination capacity which was 98%, 99% and 100% for sorghum, millet and wheat respectively at the beginning of the experiment decreased to 27%, 19% and 14% for sorghum, millet and wheat at the end of the experiment. The population build-up of the immature stages was 100, 100 and 99 larvae and for adults 0.0, 0.0 and 0.42 adults in the 1st month. At the end of 5th month the immature stages reached 816.25, 765 and 522.75 larvae, and for adults reached 67.5, 56.25 and 105 adults for sorghum, millet and wheat respectively.
Description: November 200585page
URI: http://khartoumspace.uofk.edu/handle/123456789/11066
Date: 2015-05-19


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