The scab of potato (Solanum tuberosum)‎ caused by Streptomyces scabies and its control

Other Title(s)

جرب البطاطس الذي تسببه البكترياStreptomyces scabies و مكافحته

Dissertant

Ibrahim, al-Rashid Sadiq Labbas

Thesis advisor

Baghdadi, Ahmad Muhammad

University

Omdurman Islamic University

Faculty

Faculty of Agriculture

Department

Department of Crop Protection

University Country

Sudan

Degree

Ph.D.

Degree Date

2007

English Abstract

The title of the study is The Bacteria (Streptomyces scabies) the scab of potato and its control.

The study focused on using husbandry practices to prove that: •It is easy and accessible. •It is cheap. •It doesn’t need high technology. •Saves time and money. •Prevent human kinds from the negative effects of pesticides •Save the money which could be used for perchasing pesticides for rehabilitating plant’s environment. The experiment was conducted in the areas of potato cultivation North of Khartoum State (Al Shihanab region).

Three varieties were cultivated, namely Alpha, Draga and Diamond.

Two intervals of irrigation and additional dose of fertilizer for two consequenced seasons was used. The study proved that watering and fertilizing with greater doses has negative significant effect in resisting the disease.

While the little doses of watering and fertilizing is relatively the best in resisting the disease. Alpha variety has been the best in resisting the disease, that is why the farmers prefer it.

Also it is the best to be stored and resist pests.

On the other hand productivity scale the Draga variety is the best in the first season while Diamond variety was the best in the second season. Pathogenicity potential was tested upon the caused organism for the studied varieties at the field.

The bacteria causing the disease has showed potentiality in causing disease for the plants in the field, after it has been isolated from the infected tubers at the begining and then germinated in (P.D.A) media labourately and it is well developed. Labourately the study showed the effectiveness of water extract of Neem’s seeds in suppressing the germination of the bacteria that cause common scab at 5 % and 10 % concentrations, compared with untreated dishes. The questionnaire, which was distributed in the potato cultivation areas to assess the range of economical losses from infected tubers (common scab).

Showed that there has been a significant difference between the rate of infection and sales prices.

That is to say the prices decreases when infection increases.

Also there have been significant differences among the other factors.

But there has not been a significant difference between the economical losses of the disease, sowing date, cutter tool sterilizing and soil flooding.

Main Subjects

Botany

Topics

• Censorship

No. of Pages

118

Table of Contents

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-339177