University of Khartoum

Investigationson the Causal Agents and Control of Wilt Disease of Guar (Cyamopsis tetragonoloba L.) in the Blue Nile State

Investigationson the Causal Agents and Control of Wilt Disease of Guar (Cyamopsis tetragonoloba L.) in the Blue Nile State

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Title: Investigationson the Causal Agents and Control of Wilt Disease of Guar (Cyamopsis tetragonoloba L.) in the Blue Nile State
Author: Abdelrahman, Abdelrahman Osman Dawod
Abstract: Guar crop (Cyamopsis tetragonoloba L.) is subject to quite a number of insect pests and diseases which are responsible for low yield resulting in severe economic losses. Among all these pests, wilt disease is considered as the most important fungal disease. This study was conducted in the Blue Nile State in 2014 to identify the causal agents of wilt in Guar plants. Then fungicide Apron star and nematicide Carbofuran were used to assess their efficacy in controlling wilt in Guar plants. In March 2014, infested soil samples from five agricultural schemes namely Eastern Agadi, Western Agadi, Southern Agadi, Umdeliba and Dewa were collected. Also parts ofinfected Guar plant roots, stems, pods, and seeds; from the same locations wilted Guar plants; were collected and tested in laboratory to ensure the presence of bacteria , fungi and nematodes examination revealed the presence of 11 fungi species associated with wilted Guar plants. These were: Macrophomina spp., Alternaria spp., Aspergillus flavus , A. niger, Fusarium solani, Rhizoctonia spp. , Rhizopus spp. , F. oxysporum, Penicilum spp, A. fumigates, R. solani . The results indicated that no bacteria or pathogenic nematodes were detected. Alsorevealed that Western Agadi was the most infected location with 14.18 frequent percentages. Frequent infection percentages of 11.45, 9.90, 6.90, and 1.45 were recorded for Eastern Agadi, Umdeliba, Southern Agadi and Dewa respectively. Macrophomina spp. was the most frequent fungal species detected with frequent percentage of 40-80 except in Dewa. Within the different plant parts seeds, by the far, were the most contaminated part. The application of Apron star and Carbofuran each alone gave less protection than when combined together. But, in the comparison between them each alone, Apron star was more effective. The highest percentage decrease in disease symptoms (yellowing, dropping and wilt) recorded were 40.6%, 43%, 46%, respectively. For the growth attributers, the highest percentage increase in growth parameters (plant height, number of branches, number of leaves and number of flower) recorded were 47.55%, 11.11%, 22.86%, 41.50%, respectively. Statistical analysis revealed that there were significant (P≤0.05) enhancement of growth parameters, in plant height, number of leaves, number of branches, number of flowers and total yield when Apron star and Carbofuran were used together. Also in the same treatment significant decrease (P≤0.05) in yellowing, dropping and wilt were recorded. The present study recommend the dressing of Guar seeds with fungicides such as Apron star (at the recommended).
URI: http://khartoumspace.uofk.edu/123456789/25013


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